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782 Commits

Author SHA1 Message Date
Thomas Harte
4d4a0cf1d2 Puts the disk controller back into the loop with knowledge about reading mode, and uses that knowledge to cut off the PLL. 2017-09-14 22:30:40 -04:00
Thomas Harte
82b13e98f2 Implements the real hardware ready test for Drives — motor on plus two index holes. 2017-09-11 22:27:50 -04:00
Thomas Harte
9ac831b09c Added an additional protection against overflow. 2017-09-11 22:24:24 -04:00
Thomas Harte
96bf133924 Withdraws requirement for DiskController users to specify a PLL multiplier or to provide rotation speed. 
In the latter case because it's no longer of any interest to the controller, and in the former because I'd rather it be picked automatically.
 2017-09-10 22:56:05 -04:00
Thomas Harte
6d6cac429d Fixes extra time accumulation during track running. 
Introduces a bunch of further asserts, which aided me in determining the fix, i.e. that Drives being responsible for their own setup_track could double-pump the event loop.
 2017-09-10 22:44:14 -04:00
Thomas Harte
dc0b65f9c9 Corrects initial event loop timing state. 2017-09-10 20:51:21 -04:00
Thomas Harte
8882aa496f Corrected wiring to get advance signals through to Drive event delegates. 2017-09-10 20:51:05 -04:00
Thomas Harte
0622187ddf Strips Controller of all capabilities now housed on the Drive. 2017-09-10 19:23:23 -04:00
Thomas Harte
523e1288fa Updates the MFM parser to use SingleTrackDisk rather than the equivalent withdrawn Drive functionality. 2017-09-10 17:34:52 -04:00
Thomas Harte
1a96cce26f Implements SingleTrackDisk, a Disk that contains only a single, specified, track. 2017-09-10 17:34:14 -04:00
Thomas Harte
a4e275e1fc Provides an implementation of Drive's new interface. 
Mostly lifted from DiskController. `set_disk_with_track` has been withdrawn in favour of providing a suitable wrapper `Disk` subclass, as being an unnecessary complexity and intermingling of concerns.
 2017-09-10 17:33:01 -04:00
Thomas Harte
6075064400 Adds the ability to query a TimedEventLoop for its input clock rate. 2017-09-10 17:31:43 -04:00
Thomas Harte
ff6e65cca9 Introduces necessary storage and interface for writing. 2017-09-10 16:23:31 -04:00
Thomas Harte
90d2347c90 Extended to permit subclasses that are interested to get sub-run_for information about event times. 2017-09-10 14:44:38 -04:00
Thomas Harte
90c7056d12 Started devolving timed event loop logic down to the drives, moving them closer to modelling real life. 2017-09-10 14:43:20 -04:00
Thomas Harte
a3e2d142e3 Extends UEF support to include chunk 0005, the target platform description, which is exposed via TargetPlatform::TypeDistinguisher. 2017-08-27 15:43:09 -04:00
Thomas Harte
4465098157 Since it has descendants, gives Storage::Cartridge a virtual destructor. 2017-08-27 15:19:30 -04:00
Thomas Harte
56dd677e9c Creates a virtual interface that can be adopted by classes that are able to provide some insight as to target machine. 2017-08-27 15:19:03 -04:00
Thomas Harte
9aa150c338 Abstracts the target platform type out from the static analyser's ownership. 2017-08-27 15:02:13 -04:00
Thomas Harte
c6e6c3fcfb Resolves all current analyser warnings. 2017-08-24 22:18:44 -04:00
Thomas Harte
0cbc1753b9 Quick fixes: the binary tape player now considers talk to the sleep observer only if motor control changes. The Amstrad CPC no longer attempts to use the component argument to identify the caller, since this will often be that of the superclass and not that of the derived class known to the CPC. 2017-08-20 13:18:46 -04:00
Thomas Harte
8fdc5012e4 Updated TapePlayer and BinaryTapePlayer to be sleepers. 2017-08-20 12:18:36 -04:00
Thomas Harte
49285e9caa Attempted to implement Sleeper in Drive and therefore in DiskController. Also corrected a couple of nonconformant file names. 2017-08-20 11:54:54 -04:00
Thomas Harte
5344e3098b Minor: made has_disk something that is decided on insertion/deletion. 2017-08-20 10:55:08 -04:00
Thomas Harte
ef07c33741 Merge branch 'Plus10' into MFMParserDensity 2017-08-18 15:48:20 -04:00
Thomas Harte
e559a65ede Ideally I would be able to kill this multiplier, as it could easily be derived at runtime. But, for now, just turned it up so that the analysis-oriented parser is better at parsing different bit rates. 2017-08-18 15:47:46 -04:00
Thomas Harte
af61a7fa28 Two quick fixes: correctly set segment size, and flip bytes to match HFE's bit ordering to PCMTrack's. 2017-08-17 22:28:00 -04:00
Thomas Harte
c8c1792c3f Made a first attempt at HFE support. 2017-08-17 22:20:02 -04:00
Thomas Harte
e6683e7f2d Added the base skeletal stuff of HFE support. 2017-08-17 21:48:48 -04:00
Thomas Harte
0c1714b695 Relaxed a little to allow +10% in track length. 2017-08-17 21:36:14 -04:00
Thomas Harte
2c2dd8073c Modified to return nullptr if asked for an extended disk image track that doesn't exist. 2017-08-17 15:32:24 -04:00
Thomas Harte
4f8b89772e Improved logic for detecting when all sense has been derived from a track to spot any repeated track, not necessarily the first one. That avoids sectors that run over the index hold and obscure the first throwing things. 2017-08-17 15:31:53 -04:00
Thomas Harte
733ee5a5c3 Ensured no attempt to put a null track into the cache 2017-08-17 15:30:02 -04:00
Thomas Harte
fedf5a44a6 Imposes a maximum track length. 2017-08-17 15:20:49 -04:00
Thomas Harte
da3e8655e9 Withdrew some caveman debugging nonsense. 2017-08-17 13:25:19 -04:00
Thomas Harte
42ad670ec8 Fixed: catalogue bitmap is in blocks, not sectors. 2017-08-17 12:47:47 -04:00
Thomas Harte
468770b382 Removed debugging nonsense. 2017-08-15 22:06:58 -04:00
Thomas Harte
6cfc3daacb Introduced a test within the disk controller so as not to request illegal tracks from disks, instead automatically substituting an 'unformatted' track. Which is just empty. 2017-08-15 21:52:12 -04:00
Thomas Harte
7b92b235e1 Further upped asserts, thereby discovering the mistake I'd recently introduced: seeking properly within the event source as per its potential left-clipping, but then not allowing for that in the calculated current time. 2017-08-15 16:25:46 -04:00
Thomas Harte
c196f0018f Upped the assert quotient. 2017-08-15 16:15:09 -04:00
Thomas Harte
73080d6c36 Added an easy way for disk controllers to clamp termination of written data exactly to the index hole. 
This commit also temporarily provides a whole load of extra logging and minor logic improvements from the 8272. I'm mid-flow on finding a particularly vicious error in its handling of writing; wait for the pull request. But, at least: now waits for the first part of a post-ID gap before writing data, and attempts partially to handle appearance of the index hole during writing a track. More work to do on that though.
 2017-08-15 16:05:10 -04:00
Thomas Harte
9541a2a5f0 Corrections: seek_to now takes the segment_start_time into account, correcting a windowing error where segments overlay other segments. Also added some asserts while bug hunting, and corrected the steps taken when inserting a longer-than-a-track segment so that each is correctly windowed. 2017-08-15 15:54:09 -04:00
Thomas Harte
944222eba4 Added: write_id_data_joiner can now be instructed not to write the first portion of gap. Which makes more sense as an option, to avoiding splicing errors. 2017-08-15 15:29:23 -04:00
Thomas Harte
a366298022 Factored out the standard [M]FM gap and mark groups, to increase 8272 readability and because it's pretty-much certain I'll need them again if ever I try to tackle e.g. the 8271. 2017-08-14 16:03:35 -04:00
Thomas Harte
4df9307d25 Factored out the dull and repetitious stuff of writing n bytes of the same value. 2017-08-14 15:50:36 -04:00
Thomas Harte
cefec7a19f Sought more robustly (i.e. less repetitively) to handle dispatch, including cancelling seeks where appropriate. 2017-08-14 10:37:39 -04:00
Thomas Harte
1011143dbe Sought to correct my interpretation of 'gap 3'. 2017-08-13 21:52:48 -04:00
Thomas Harte
750f2cb883 Flagged as not read-only, at least for now, to allow 8272 writing tests definitively to function. 2017-08-13 18:54:39 -04:00
Thomas Harte
1576b4500b Added documentation. 2017-08-13 18:27:00 -04:00
Thomas Harte
e1e9a06712 Made an attempt at format a track. 2017-08-13 18:05:19 -04:00
Thomas Harte
6e36f8ffa4 Removed index-hole announcement. 2017-08-13 12:50:24 -04:00
Thomas Harte
b0a7208cc7 Strung together a very basic version of 8272 write [/deleted] data. Lots of cases as-yet unhandled. 2017-08-13 12:50:07 -04:00
Thomas Harte
eec42aa7ae Entrusted further status to drives; also adjusted them to report read only if diskless, which I now believe to be correct. 2017-08-13 11:50:49 -04:00
Thomas Harte
186048a88e Made an attempt to fix the condition for setting a broken header CRC. 2017-08-12 16:39:32 -04:00
Thomas Harte
daafebe7ac Moved curly bracket. 2017-08-11 19:19:04 -04:00
Thomas Harte
2d81acb82e Upped C++ standard to C++14 and added an #if that's intended to use the built-in std::gcd when compiled on C++17 or better. Fixed for new signedness warnings resulting for taking the step to C++14. 2017-08-11 19:18:45 -04:00
Thomas Harte
82ca49c840 Adjusted to avoid calls to ::greatest_common_divisor(numerator % denominator, denominator) unless necessary. 2017-08-11 19:05:46 -04:00
Thomas Harte
0c8769e335 Just to be safe. 2017-08-11 18:41:08 -04:00
Thomas Harte
83c7d34df2 Switched to populating the sector cache with everything in a track the first time anything on that track is requested. That avoids the problem whereby each request of a non-existent sector costs two spins. 2017-08-11 18:40:16 -04:00
Thomas Harte
a12671010a Sector size is now reported, and CRC failures are merely indicated, not cause for a sector to be thrown away. 2017-08-11 16:23:33 -04:00
Thomas Harte
edb088526f Simplified slightly, and updated TODO as to still-missing functionality. 2017-08-11 14:33:34 -04:00
Thomas Harte
80ebc63101 Updated the SSD file format container to specify sector sizes, now that it's no longer implicit. 2017-08-11 14:30:35 -04:00
Thomas Harte
cf1403bc79 Increased documentation. 2017-08-11 14:27:07 -04:00
Thomas Harte
fcf63a7547 Expands the [M]FM encoder to respect some new Sector flags: it will now wilfully make CRC errors, omit data, include data that is different than the ID's declared length, write deleted data, and can be commanded as to header/data gaps and what should be within them. All based around expanding towards the needs for reproduction of the CPC's .DSK file format. 2017-08-11 14:24:50 -04:00
Thomas Harte
0411b51582 Added an attempt to deal with 16-bit allocation units, and to ensure middle-of-file holes are respected. 2017-08-11 10:59:37 -04:00
Thomas Harte
026101a268 Killed logic_extents_per_physical, since I don't know how to handle it, and instituted tracks, to allow a decision about short versus long allocation units. 2017-08-11 10:46:50 -04:00
Thomas Harte
734099a956 Threw a sector cache into my MFM parser, in an attempt to cut down analysis costs. Also made it aware of multiple heads. 2017-08-11 10:29:13 -04:00
Thomas Harte
6be5851484 Cleaned up. 2017-08-10 22:34:29 -04:00
Thomas Harte
994179f188 Taking a whole bunch of guesses, this might be correct. 2017-08-10 22:33:08 -04:00
Thomas Harte
6a65c7a52a Started working on a CPC-oriented analyser; for now I just want to be able to make a good guess at the appropriate file to load from a disk. As it turns out, the CPC simply adopts the CP/M format, so a generic parser is appropriate. This is its beginning. 2017-08-10 17:10:21 -04:00
Thomas Harte
7d1023ea98 Added a 'ready' getter to Drive, formally to let the drive take ownership of that test. 2017-08-08 21:15:56 -04:00
Thomas Harte
2b0dcf8573 Transcribed the status bits that I think actually need to be obeyed. 2017-08-07 12:37:45 -04:00
Thomas Harte
47732ffb98 Prevented the 8272 from overreading ID fields (and, by doing so, overrunning its internal buffer). Exposed the MFMController's CRC generator for inspection. 2017-08-07 12:37:22 -04:00
Thomas Harte
56d65ba6f3 Adapted slightly, to retain the ability to advertise an incorrect size, to adjust the confusion I've created by having two different types of thing both called new_sector, and to print a warning when ignoring error flags. 2017-08-07 12:12:04 -04:00
Thomas Harte
895a3cbf24 Corrected reading of the track size table for extended disks. My first extended disk has now loaded. 2017-08-07 11:38:19 -04:00
Thomas Harte
d951c8c1c2 Fixed search for track start position with extended disks: it's no longer an infinite loop. So that's a pretty good performance improvement. 2017-08-07 11:36:29 -04:00
Thomas Harte
a294963e98 Made an absolutely basic attempt to accommodate some extended disk images. 2017-08-07 11:26:15 -04:00
Thomas Harte
c839556a27 Fixed: rewind the file to check for 'EXTENDED' if 'MV - CPC' failed. 2017-08-06 19:47:10 -04:00
Thomas Harte
77da582e88 Switched the container in which events are passed to int, with the intention of subclasses extending the receivable range. 2017-08-06 12:35:20 -04:00
Thomas Harte
ffadb04761 Documented, and removed a couple of Event types that are WD-specific but had accidentally flown into here. Will need to figure out how best to expose the CRC result too, but I'm willing to let that one drop out naturally as I implement the 8272. 2017-08-06 11:36:36 -04:00
Thomas Harte
29288b690e Switched disk controllers to be instantiated explicitly in terms of cycles, created an Amstrad-specific subclass of the 8272 to record the direct programmatic availability of all disk motors bundled together, and otherwise adjusted to ensure the thing is clocked and that the motor is enabled and disabled appropriately. The 8272 is also now formally a subclass of the incoming MDM controller. 2017-08-06 09:45:16 -04:00
Thomas Harte
4d60b8801c Started trying to factor out just the PLL stream -> FM/MFM events part that is presently in the WD1770. 2017-08-05 22:26:15 -04:00
Thomas Harte
192f232d3f Silenced warnings. 2017-08-05 11:53:29 -04:00
Thomas Harte
6e4d3b8a77 Added enough logic to produce some sort of version of a completely unprotected DSK. So enough to start bootstrapping an FDC emulation, at least. 2017-08-05 11:44:53 -04:00
Thomas Harte
8eda24261c Removed unnecessary header — it's implied by being a child of FileHolder. 2017-08-05 11:44:06 -04:00
Thomas Harte
75c59fefab Added an empty husk to begin support for Amstrad CPC disk image formats. 2017-08-05 10:02:10 -04:00
Thomas Harte
a3b16b6dfa Further beefs up the list of chunks that this TZX parser can either comprehend or skip. 2017-08-03 12:13:41 -04:00
Thomas Harte
2d2cefb0b0 Adjusted factoring to introduce support for block 10. 2017-08-02 14:36:47 -04:00
Thomas Harte
2fd071e45d Made an honest attempt at outputting turbo speed data block data. The CPC now at least starts to load. 2017-08-02 14:24:34 -04:00
Thomas Harte
d7a5c3f49a Added support for the ID 20 block and fixed a minor error in my skip-the-contents version of block 11: length is three bytes long, not two. This gives me enough structure properly to get to the end of my current test CDT, albeit without making any of the noises. 2017-08-02 14:12:34 -04:00
Thomas Harte
819761f9fb Fixed another uninitialised pointer. 2017-08-02 13:56:35 -04:00
Thomas Harte
9d953421d8 After a quick check, added a couple of other _delegate initialisations. I should probably find a way to template this. 2017-08-01 07:07:43 -04:00
Thomas Harte
4b5e9ffb83 Ensured is_at_end_ is initially cleared by default. 2017-07-27 22:22:43 -04:00
Thomas Harte
4abd62e62b Standardises on const [Half]Cycles as the thing called and returned, rather than const [Half]Cycles & as it's explicitly defined to be only one int in size, so using a reference is overly weighty. 2017-07-27 22:05:29 -04:00
Thomas Harte
8361756dc4 Switched definitively to the works-for-now approach of requiring an explicit opt-in where somebody wants to clock a whole-cycle receiver from a half-cycle clock. 2017-07-27 07:40:02 -04:00
Thomas Harte
75d67ee770 Relocated ClockReceiver.hpp as it's a dependency for parts of the static analyser, and therefore needs to be distinct from the actual emulation parts. 2017-07-25 20:20:55 -04:00
Thomas Harte
a1e9a54765 Eliminated redundant uses of ClockReceiver and sought to ensure that proper run_fors are inherited all the way down. 2017-07-25 20:09:13 -04:00
Thomas Harte
8d1dacd951 Clean ups along the Electron::Tape line: ensured that the ClockReceiver is opted into only once, and that its run_for propagates all the way along the chain. 2017-07-25 20:01:30 -04:00
Thomas Harte
d056f2e246 Updated comment. 2017-07-24 21:51:22 -04:00
Thomas Harte
8a2bdb8d22 Converted the TimedEventLoop and the things that sit atop it into ClockReceivers. 2017-07-24 21:19:05 -04:00
Thomas Harte
b3ae920746 Converted the DPLL and disk controller classes to be ClockReceivers. 2017-07-24 21:04:47 -04:00
Thomas Harte
6633537fb8 Discovering that there is such a thing as P81 — a ZX81 file without the name omitted — added support for it. Extended FileHolder while I was here to retain the file name and be able to supply its extension, as my quick-fix test-the-last-character approach to o/p/80/81 discrimination stops working with p81 thrown into the mix and this feels like the correct factoring. 2017-07-22 16:02:25 -04:00
Thomas Harte
313b36944f Ensured that the final bit of a tape isn't dropped even if the tape ends exactly after it, by not posting a false pulse, being less restrictive about what can cap a bit, and in any case using a long gap as the end-of-file bookend. 2017-07-22 15:41:33 -04:00
Thomas Harte
456fdda6c2 Ensured that the mark_end step can't overwrite another recognised symbol. 2017-07-22 15:40:22 -04:00
Thomas Harte
45ec5f8eab Eliminated implicit sign conversion. 2017-07-21 21:53:27 -04:00
Thomas Harte
1d01acce06 Fixed differing types of loop variables and targets. 2017-07-21 21:53:05 -04:00
Thomas Harte
6d5807ec4b Fixed sign and ensured that the DataFromString implementation is of the thing declared in the header. 2017-07-21 21:24:28 -04:00
Thomas Harte
64865b3f41 Signedness fixes. 2017-07-21 21:23:34 -04:00
Thomas Harte
163c0f1b44 Ensured offset means exactly one thing. 2017-07-21 20:58:17 -04:00
Thomas Harte
2d8e7e9f8b Removed reference to a parameter long-since dead. 2017-07-21 20:46:25 -04:00
Thomas Harte
a026998682 Marginally optimised set_offset to avoid resets when possible. 2017-07-21 20:43:20 -04:00
Thomas Harte
06ea81fdb2 Made sure that unrecognised waves don't block the symbol queue, and allowed any type of nonsense to be skipped before finding a byte. 2017-07-21 20:23:26 -04:00
Thomas Harte
d69b1e2d11 Switched parsing logic to looking only for upward zero crossings, that being my new understanding of the ROM. 2017-07-21 19:39:38 -04:00
Thomas Harte
a3e0024980 Chopped time accumulation out of the default Tape process because it's proving to be sufficiently expensive for a TZX as not to be worthwhile. Introduced a cheaper position capturing/restoring method. 2017-07-21 18:55:03 -04:00
Thomas Harte
d9a2c32aca Made an attempt to obey the proper TZX rules on gaps, and to hit the common-clock-rate Time optimisation. 2017-07-21 18:21:12 -04:00
Thomas Harte
e152ed2e61 Made an attempt to avoid GCD costs when accumulating Times with a common clock rate (/divisor). 2017-07-21 18:20:27 -04:00
Thomas Harte
70af075012 Determined what appears to be an appropriate workaround for the ZX81 TZX that I've managed to obtain. 2017-07-19 21:28:33 -04:00
Thomas Harte
c8cee88e33 Ensured that a stopped tape outputs a false level and took an extra safety check in instantiation. 2017-07-18 22:49:11 -04:00
Thomas Harte
35296017b5 Clarified meaning of is_high_ flag and ensured it is honoured properly. 2017-07-17 21:36:05 -04:00
Thomas Harte
130d598ec9 Corrected some minor out-of-style breaks, and ensured that the name of ZX81 files is returned. 2017-07-17 19:52:54 -04:00
Thomas Harte
0350925c1e Started sketching out greater support. Mostly TODOs right now, but pulse sequence and pure tone are implemented. I probably also need at least the CSW block to hit everything you might see in a ZX80 or ZX81 tape. Then I can worry about the rest when I have a way to test them. 2017-07-17 19:38:15 -04:00
Thomas Harte
94e3dd0d4f Merge branch 'master' into TZX 2017-07-17 19:07:05 -04:00
Thomas Harte
eafdd7dbd7 Corrected decompressed size expectations: it may be up to five times the size of the number of waves, as waves are up to five bytes in length. 2017-07-17 19:04:25 -04:00
Thomas Harte
127b584e79 Ensured that resetting a TZX resets the is-at-end flag. 2017-07-17 07:52:28 -04:00
Thomas Harte
2179edc7fe Adjusted to allow the very first thing found to be data, and ensured that unrecognised symbols break files just as gaps do. 2017-07-17 07:43:47 -04:00
Thomas Harte
9108495586 Added a safety seek. 2017-07-17 07:35:53 -04:00
Thomas Harte
fa617eac6b Spotted that pilot and data segments have different encodings — of course! — and attempted to adapt. 2017-07-17 07:34:10 -04:00
Thomas Harte
b63971caf7 Took a first, incorrect, shot at TZX chunk 0x19, the generalised data block. 2017-07-16 22:40:38 -04:00
Thomas Harte
7327da6350 Switched the nascent TZX to use the new PulseQueuedTape. 2017-07-16 22:06:56 -04:00
Thomas Harte
8f72fc4a44 Factored out from the UEF implementation the concept of being a tape that has a queue of pending pulses and manages that queue. 2017-07-16 22:04:40 -04:00
Thomas Harte
238348c885 Performed the initial wiring to announce that this application supports TZX files and to route them to the ZX80/81 static analyser. The TZX class itself does not yet do much beyond basic validation. I think it'll be easiest if it follows in UEF's footsteps in queuing up pulses ahead of time, so some factoring out is now required. 2017-07-16 21:33:11 -04:00
Thomas Harte
b3861ff755 Reduced copying of Pulses. 2017-07-16 19:49:31 -04:00
Thomas Harte
c2bc34fd87 Eliminated the PLLParser class. I think the proper abstraction if and when another machine requires PLL-esque parsing is probably to template out the Acorn wiring of a PLL to a Parser, and/or generalise the Acorn shifter. It'll be easier to decide when the time comes. 2017-07-16 19:25:26 -04:00
Thomas Harte
1d3ae31755 Abstracted the concept of an Acorn shifter away from being a PLLParser. The Acorn tape parser now skips using that class and uses the shifter. The actual Electron also uses the shifter. So the two are completely aligned. Net result: the Electron should successfully load exactly when static analysis was successful. 2017-07-16 19:24:01 -04:00
Thomas Harte
e5188a60dc Settled on the new average-of-length approach to a PLL window sizing, eliminating the old errors-of-phase approach. Since it anchors automatically to the original target clocks per bit, killed the explicit mention of a tolerance. 2017-07-16 19:03:50 -04:00
Thomas Harte
e71d13c090 With the new PLL implementation, switching to a deeper window size returns the Acorn tape parser to: working. 2017-07-16 17:12:12 -04:00
Thomas Harte
51177e4e1f Attempted a different implementation of the PLL, that responds to changes only once. 2017-07-16 16:49:04 -04:00
Thomas Harte
c8575fe6e0 Mild clean ups, and a tweak to permitted top and bottom phase. 2017-07-16 13:39:08 -04:00
Thomas Harte
4489f120f9 Eliminated foolish double indirection on phase history. 2017-07-15 22:40:38 -04:00
Thomas Harte
253f9603ed Split the normal tape parser class into two in order to add a new option: a PLL-driven tape parser. Decided to see what happens if I attempt to use that to parse CSW Acorn data. 2017-07-15 19:07:35 -04:00
Thomas Harte
b743566339 Corrected under-request of data: was erroneously supplying the size of input as the expected size of output. 2017-07-15 15:19:03 -04:00
Thomas Harte
648618d280 Tweaked bit timing decision. 2017-07-13 21:26:05 -04:00
Thomas Harte
ae1a130843 Fixed: length of 0 is a special case. 2017-07-13 20:57:27 -04:00
Thomas Harte
33d16ae0cd Fixes: individual static analysers reset tapes, for potential successors. The ZX81 file analyser no longer overruns its buffer upon receiving a file that is shorter than 11 bytes. 2017-07-12 21:34:08 -04:00
Thomas Harte
f09fe30af5 Attempted a full implementation of CSW. All in memory for now. 2017-07-12 21:23:59 -04:00
Thomas Harte
33eadb5549 Started taking further steps towards CSW support; reading the ZLib documentation is next. 2017-07-11 22:41:10 -04:00
Thomas Harte
368bff1a82 Added a shell class that will one day be able to parse CSW files, plus the logic and metadata to instantiate it when a CSW presents itself. 2017-07-10 21:43:58 -04:00
Thomas Harte
d853841dd5 Further lightened up my file-is-ZX81 check. 2017-07-10 20:44:13 -04:00
Thomas Harte
bcb7c27cc4 Given that I'm not racing this any more, turned the intended 1 second back into 1 second. 2017-07-08 19:21:33 -04:00
Thomas Harte
2f42874fd3 Another fix to deal with real-time fighting: allow 8 and 18 pulses to be recognised as 1s and 0s. That's because the hand-off from ROM routines to parsing may occur very shortly before the first pulse of a valid sequence, making it look like there's a ghost. A cleaner solution needs to be found, probably revolving around allowing parsers to be attached to tapes and therefore to run constantly. 2017-07-06 22:33:03 -04:00
Thomas Harte
84d0e9b4cd Accept a pulse that begins exactly on seek_time as being found while seeking. 2017-07-06 22:31:45 -04:00
Thomas Harte
a53011f778 Extended intro and outro length because right now I'm racing this myself. Can return to normal once tape motor control is implemented. 2017-07-06 22:31:12 -04:00
Thomas Harte
919fc48cc5 Fixed dumb out-of-bounds access error. 2017-06-22 22:28:50 -04:00
Thomas Harte
87ee8450fe Minor rejig: it's much more likely that something that can't be distinguished is a ZX81 program. TODO: some sort of BASIC token parsing, to be more confident. 2017-06-22 20:23:14 -04:00
Thomas Harte
52d9ddf9e5 Gave the binary tape player a more logical assignment of wave level to output level. Which miraculously appears to have been the issue with the ZX80/81 tape loading — the inconsistency of silences seems to have been the issue. 2017-06-21 22:13:24 -04:00
Thomas Harte
e6e6e4e62b Adds an extra character for padding the ZX81 table. 2017-06-12 22:08:11 -04:00
Thomas Harte
626737b9fa Started mucking about with some string conversion routines. Not finished yet. 2017-06-12 21:32:36 -04:00
Thomas Harte
22de481557 Made an attempt to get .p/.80 checked and as far as the emulated machine. 2017-06-12 19:41:59 -04:00
Thomas Harte
77aa3c187e Rebranded ZX80O as ZX80O81P, with an eye to making it accept ZX81 .p files. Adjusted the initial selection part of the static analyser appropriately. 2017-06-11 21:38:32 -04:00
Thomas Harte
ee0283c985 Modified to use an in-memory buffer for file contents. 2017-06-11 21:35:09 -04:00
Thomas Harte
2c6414ce11 Adjusted to allow inspect_waves to swallow a gap before a bit if necessary, increasing the opportunities for its call. 2017-06-11 18:31:09 -04:00
Thomas Harte
e5aea632ee Updated curly bracket placement. 2017-06-11 17:29:22 -04:00
Thomas Harte
c2bc9a8c62 Ensured no namespace collision in double-include guards. 2017-06-11 16:41:15 -04:00
Thomas Harte
256ba4028b Rejigged to eliminate semi-duplication of the is-a-file test. 2017-06-08 21:52:13 -04:00
Thomas Harte
b07af2660d Adjusted to make sure that the very end of a tape is properly measured. 2017-06-08 21:33:35 -04:00
Thomas Harte
bc0d70b2f7 Added: a shout-out when the tape has been exhausted. 2017-06-08 21:32:27 -04:00
Thomas Harte
c6e48dfd56 Given that a final gap is semantically part of describing tape contents, ensured one formally appears before declaring that the tape has ended. 2017-06-08 21:31:54 -04:00
Thomas Harte
c775db50ef Ensured no out-of-bounds accesses. 2017-06-08 21:31:03 -04:00
Thomas Harte
ee4c8b5ad2 Ensured final byte plays out. 2017-06-08 19:51:49 -04:00
Thomas Harte
d8b76e31c3 Added and improved the is-this-ZX80-stuff test. It seems some bytes are going missing in the to->from tape conversion. 2017-06-08 19:49:18 -04:00
Thomas Harte
7e10c7f9d8 Relocated the ZX80/81 concept of a 'file' out from Tape into Data, given that it's an exact duplicate of memory. 2017-06-08 19:09:51 -04:00
Thomas Harte
c47128f433 Widened tolerances and ensured zero bits aren't prematurely discarded. 2017-06-07 17:50:03 -04:00
Thomas Harte
8aab9acc10 Eliminated use of the zero level; now definitively returns a low/high input. 2017-06-07 17:39:29 -04:00
Thomas Harte
dbd2944c13 Took an initial run at the ZX80/81 parser. 2017-06-07 17:27:05 -04:00
Thomas Harte
4603fa6f24 Extended explicitly to support a token of lookahead, which is pretty much what was on offer anyway. Also corrected instance variable names, as per better adoption of C++ norms. 2017-06-07 17:21:57 -04:00
Thomas Harte
60300851ea Started sketching out a tape parser for ZX80 and '81 files. I think this'll help me to verify whether the .O input is working. 2017-06-07 10:12:13 -04:00
Thomas Harte
58312ea2b7 Updated to new standardisation on curly bracket placement. 2017-06-07 10:05:43 -04:00
Thomas Harte
cb534d8b85 Corrected comment. 2017-06-07 10:05:16 -04:00
Thomas Harte
4677cebf40 Rejigged to correct: spaces go after bits, not after bytes. 2017-06-06 18:29:15 -04:00
Thomas Harte
7399f3d798 Caveman debugging in place, it looks like this file is returning nonsense. 2017-06-06 18:18:55 -04:00
Thomas Harte
faeecf7665 Made sure that there's nothing but silence at the end of the tape, even if the .O file is too long. 2017-06-06 18:16:47 -04:00
Thomas Harte
8c1769f157 Made a quick attempt at serialising from ZX80 .O to waves. 2017-06-04 16:59:26 -04:00
Thomas Harte
655809517c Ensured that there is a subclass of file that is entrusted to load .O/.80 files, and that the code routes such files to it, noting that it should consider whether a ZX80 is required. 2017-06-04 16:37:03 -04:00
Thomas Harte
5d91a2600d Permitted ROM-style PRGs that are not a power-of-two in size, and added extra safety checks on loading data from a tape. 2017-05-08 22:15:35 -04:00
Thomas Harte
2807e3134f Implemented speedy header finding. So that's half of it. 2017-05-07 20:32:48 -04:00
Thomas Harte
e01f3f06c8 Completed curly bracket movement. 2017-03-26 14:34:47 -04:00
Thomas Harte
f94f34f053 Made an attempt at read track. Which means process_input_bit can't just swallow syncs any more; it now reports them as tokens of type ::Sync. 2017-01-01 20:39:19 -05:00
Thomas Harte
b3c33d993a Made an attempt to explain the requirements placed upon Disk subclasses that wish to support writing. 2016-12-31 15:30:48 -05:00
Thomas Harte
8eb21c6702 The "MFM...Byte"s aren't MFM-specific, they're relevant to both FM and MFM encoding. So renamed them. Also slimmed syntax within MFM.cpp mostly where emigration from the Acorn disk analyser had left a residue of lengthy namespace specification. 2016-12-31 15:25:11 -05:00
Thomas Harte
52b850a3f5 Quick extra: make sure parsed tracks don't overflow the 6400 byte space available in an MFM disk. Which might be better expressed as 6250? 2016-12-31 12:51:52 -05:00
Thomas Harte
cfbab1448c Switched to a track parsing that disallows synchronisation values within sector contents. 2016-12-31 12:23:08 -05:00
Thomas Harte
12549ff412 Might as well get the file offset before entering the critical section; also moved the lock guard down more explicitly to group with the second set of actions. 2016-12-31 11:48:46 -05:00
Thomas Harte
6f0b5427e4 Made an attempt to avoid repetition of sync bytes. 2016-12-31 00:20:00 -05:00
Thomas Harte
0123b37213 Made an attempt to include sync values in the stream and properly to align. 2016-12-31 00:11:31 -05:00
Thomas Harte
ea4d85e1cd The virtual disk constructed is the same across all tracks. So why not just request zero? 2016-12-31 00:10:35 -05:00
Thomas Harte
f217d508b8 Completed first attempt at write support for Oric disk images. 2016-12-30 23:12:46 -05:00
Thomas Harte
1f625fad66 Decided that if this is an [M]FM parsing function then it should be something more intelligent than a mere PLL record. Which I guess conveniently implies Oric DSK-esque behaviour. But properly defined, rather than very vaguely. 2016-12-30 23:10:52 -05:00
Thomas Harte
632b3c63b1 Added the infrastructure necessary for Oric disks to appear writeable to the machine and to receive changed tracks. 2016-12-30 22:51:48 -05:00
Thomas Harte
d581294479 Added get_track to get the PLL output for a complete track. 2016-12-30 19:59:23 -05:00
Thomas Harte
0f399b0a0c Made type conversion explicit. 2016-12-30 19:59:01 -05:00
Thomas Harte
3b29e6a473 Ensured SSD and ADFs are grown if required. 2016-12-30 18:08:12 -05:00
Thomas Harte
07dacff42d Added writing for Acorn ADF disks, plus appropriate TODOs in both similar bits of boilerplate. 2016-12-30 18:03:30 -05:00
Thomas Harte
c85450648f Fix: make sure copies have proper event lengths. Also made it much clearer what's going on with the initial copy to the heap. 2016-12-30 17:55:46 -05:00
Thomas Harte
c740d9655a Fixed: index_count_ may have been left high by a previous call; reset it just in case. 2016-12-30 17:55:06 -05:00
Thomas Harte
d09e7ac1e8 Made an attempt at reacting appropriately if the very first thing that looks like a sector doesn't pan out. 2016-12-30 17:44:35 -05:00
Thomas Harte
5d63556870 Periods need a custom copy constructor too, if they're going to avoid sharing an event_source. 2016-12-30 17:39:52 -05:00
Thomas Harte
81a3cbac45 Ensured a copy is passed for writing back rather than the original. 2016-12-30 17:26:44 -05:00
Thomas Harte
63ff5165a4 After a quick bit of reading, discovered the virtual copy constructor pattern really is only a convention in C++, and conformed to it. Which hopefully gives copyable tracks. 2016-12-30 17:25:39 -05:00
Thomas Harte
71dbd78cf2 If asynchronous background processing is to occur on tracks then, given that they inherently have state, they'll need to be copyable, and ideally 'cheaply' (though it's not too great a priority). So started implementing appropriate copy constructors. Also introduced an extra level of indirection to PCMSegmentEventSource so that it can copy itself without copying the underlying PCMSegment, which is 95% of the heft of a track in all currently-implemented cases. 2016-12-30 14:23:26 -05:00
Thomas Harte
f88f3c65e9 Removed duplicated newline. 2016-12-30 14:21:36 -05:00
Thomas Harte
82bb78fb2d Ensured that get_sector copes even if any invalid sectors are encountered. 2016-12-30 14:21:14 -05:00
Thomas Harte
6fc692cd34 Attempted to switch to an asynchronous means for continuous file updates. Testing with SSD, as usual. 2016-12-29 22:15:58 -05:00
Thomas Harte
bbd94749f4 ... and I guess an instant maximal simplification is also easy if length ends up being 0 2016-12-29 11:02:21 -05:00
Thomas Harte
54900ca3fb Addition and subtraction can end immediately without performing any extra work if the operand is 0 2016-12-29 11:00:47 -05:00
Thomas Harte
b9fad184d7 Added just enough for a complete manual test of writing to a .ADF with the 1770 then getting the correct result parsing it back on the host side in order potentially to update a file. 
... which means that now it's time to worry about when and how mounted files should actually update themselves. Which will make for some fun with threading, I dare say.
 2016-12-28 23:00:47 -05:00
Thomas Harte
af1b396c9e Found an ugly issue with Storage::Time as implemented (i) to be unsigned; and (ii) automatically to simplify. Will need to fix. Here's a quick workaround for this one segment of code. 2016-12-28 22:57:11 -05:00
Thomas Harte
9cb902cc4f Experimentally marked ADF as writable too, immediately discovering a mistake in the analysing MFM decoder. 2016-12-28 22:34:22 -05:00
Thomas Harte
bfe6c0a0c1 Ensured that FileHolder gets a writeable file reference if one is possible, and records whether the file in hand is read-only. So now the SSD class can answer honestly. 2016-12-28 20:09:14 -05:00
Thomas Harte
46a93d2e12 Fixed errors to ensure that FM disks, at least, follow the same CRC generation rules when being built from sectors and when being parsed. 2016-12-28 19:48:46 -05:00
Thomas Harte
720b1e5802 Attempted to ensure proper CRC generation for FM-format input. 2016-12-28 18:56:53 -05:00
Thomas Harte
3a9ad3fb08 Fixed Oric .DSK handling, per my latest understanding. Which creates a desire to write shorts directly to the disk surface, so exposed that in the encoder. 2016-12-28 18:50:28 -05:00
Thomas Harte
a568172758 Made steps towards proper CRC generation. Am currently comparing against Oric disk images, as — amongst other things — they include precomputed CRCs. 2016-12-28 18:29:37 -05:00
Thomas Harte
0490a47058 Worked on the all-around framework for decoding sectors back from tracks when closing down a file. Hit the wall that the parser is more observant of CRCs than the WD. No, really. So I guess I have to stop avoiding that whole issue. 2016-12-26 14:24:33 -05:00
Thomas Harte
742c5df367 With lots of logging arising temporarily, fixed bug whereby conversion to a patched track would lead to holding a track with a distinct measure of time, leading to improperly-placed patches. 2016-12-25 22:00:39 -05:00
Thomas Harte
b538ee5bd8 Fixed discovery of correct active period and setting of track time, when seeking. 2016-12-25 21:32:50 -05:00
Thomas Harte
a6d038cad9 Eliminated special case that doesn't seek properly and isn't needed. Added TODO. 2016-12-25 21:32:14 -05:00
Thomas Harte
4fca30b81f Made the Plus 3 less chatty, documented invalidate_track. 2016-12-25 21:06:58 -05:00
Thomas Harte
26710c988d Modified SSD to ensure a fully-formatted surface is represented even if no track data is in the source file. This corrects the controller's sense of write success. 2016-12-25 20:40:06 -05:00
Thomas Harte
acc35885cd Attempted to reduce track invalidations. 2016-12-25 20:38:25 -05:00
Thomas Harte
beaa868079 Factored the MFM parser out into encodings. 2016-12-25 20:00:57 -05:00
Thomas Harte
1349e85d83 [Mostly] fixed track write-back. 2016-12-25 19:19:22 -05:00
Thomas Harte
007c13ec16 Fixed: cycles_per_bit_ isn't a function of the rotational multiplier, it's absolute. Also made sure that exactly hitting the end of a bit counts. 2016-12-25 16:35:39 -05:00
Thomas Harte
98be6ede45 Shuffled a little to reduce risk of overflow, ensured writing is a loop, still seem to be writing too quickly for some reason. 2016-12-25 16:13:05 -05:00
Thomas Harte
d2ad2c756e Added enough shovelling to write rubbish for an entire sector. 2016-12-25 15:46:49 -05:00
Thomas Harte
ec55a25620 It makes sense to simplify these ahead of time. 2016-12-25 12:32:25 -05:00
Thomas Harte
aceb7e3b6b Started implementing write sector on the 1770, immediately deciding it would be useful to have a callback for end-of-queued-data-written from disk controller. So had a go at implementing that, naively. More investigation required. 2016-12-25 12:31:38 -05:00
Thomas Harte
901f19f89c Added enough stuff that SSDs attached to a 1770 will now reach the entry point for writing. 2016-12-25 09:46:12 -05:00
Thomas Harte
9d555c4a02 Let's try just declining to pump the PLL while in write mode. Added documentation to explain. 2016-12-25 09:19:18 -05:00
Thomas Harte
b57038edc5 Actually, at least index holes will still be receivable while writing, so this wasn't entirely correct. Probably best to leave it in. 2016-12-25 09:16:09 -05:00
Thomas Harte
d606bd7ce5 Added saturation test, fixed code as indicated. 2016-12-24 23:29:37 -05:00
Thomas Harte
09ff9d6a26 Introduced a couple more floating-point conversion tests, fixed errors uncovered. 2016-12-24 23:21:19 -05:00
Thomas Harte
e25195a718 Added a single test for Storage::Time, discovering that I had the wrong sign on float conversions. 2016-12-24 22:59:01 -05:00
Thomas Harte
af69b21033 This is almost complete, except that it doesn't act appropriately if some bits are written but not enough to cover the entire writing period. 2016-12-24 22:51:26 -05:00
Thomas Harte
f601d796f5 Added documentation. 2016-12-24 22:37:20 -05:00
Thomas Harte
6e94d0c19f Extended Storage::Disk::Disk to permit write-back of modified tracks, exposed some interface via Storage::Disk::Drive. 2016-12-24 22:11:31 -05:00
Thomas Harte
7f303cfceb Continued the baby steps. 2016-12-24 21:54:43 -05:00
Thomas Harte
afc6f4129c Withdrew unused tally. 2016-12-24 21:47:57 -05:00
Thomas Harte
1e416d4af0 Withdrew now-unused and never-implemented API from TimedEventLoop, and the redundant track time count from DiskController. 2016-12-24 21:02:10 -05:00
Thomas Harte
bedea48d03 This is a much better way of dealing with being partway into an incoming event. Subject to eliminating overruns, of course. 2016-12-24 20:54:27 -05:00
Thomas Harte
4cb17143ef Messing around trying to lock down timing precisely. Which includes formal initial conditions. 2016-12-24 15:18:46 -05:00
Thomas Harte
4d4852bb78 Ensured that Times start life in their simplest form. 2016-12-24 15:18:03 -05:00
Thomas Harte
4728bda0a2 Added an additional constructor to make sure that regular ints go to the correct place. 2016-12-24 13:27:57 -05:00
Thomas Harte
1e970a9772 Started stepping slowly towards allowing writing on the disk controller, taking the opportunity to introduce self-simplifying behaviour to Storage::Time. 2016-12-24 13:07:23 -05:00
Thomas Harte
e4e0347638 Attempted to consolidate some of the repetition. 2016-12-21 22:17:00 -05:00
Thomas Harte
03579f33f1 Fixed multi-coverage insertion, via an appropriate test. 2016-12-20 21:38:32 -05:00
Thomas Harte
7eca910cc5 Fixed insertion location finding logic, working on the relevant test. 2016-12-20 21:14:05 -05:00
Thomas Harte
823ab9bc34 Completed initial non-trivial test, fixing revealed errors. 2016-12-20 19:15:36 -05:00
Thomas Harte
5a508ea0df Attempted properly to cover the exactly-equal starts and ends cases, and to improve meaning. 2016-12-20 18:32:49 -05:00
Thomas Harte
63d861a2f3 Switched from C-in-the-brain manual offset counting to using iterators like an ordinary C++ person. 2016-12-20 18:17:54 -05:00
Thomas Harte
6f17076003 Switched to much more logical shared_ptr ownership of PCMSegmentEventSources by Periods. 2016-12-20 18:13:10 -05:00
Thomas Harte
497b2ae4dd Still by manual inspection: the time for the next event should be provisional until proven acceptable, allowing a proper measurement of time until exiting the period to be taken; also fixed the accumulated period error when seeking back onto the underlying track. 2016-12-20 08:14:16 -05:00
Thomas Harte
6bdde542c5 Edging towards functioning automatic tests, fixed right-period adjustment and slightly decreased searching cost while in the process of adding a test. 2016-12-20 07:52:14 -05:00
Thomas Harte
ec624eaab1 Made an attempt fully to implement PCMPatchedTrack. Which now requires tests. 2016-12-20 07:30:57 -05:00
Thomas Harte
1ef1f6ec69 Attempted to implemnt seek_to and to finish add_segment. Started doing a little of get_next_event but ran out of time for the day. 2016-12-19 21:46:02 -05:00
Thomas Harte
8f937ceac8 Made an attempt to come up with a data structure that actually makes sense (though perhaps this is textbook list rather than vector stuff? I guess it depends on the frequency I expect inserts to occur versus reads) and to implement inserts. Though the Periods aren't yet honoured. 2016-12-19 07:42:43 -05:00
Thomas Harte
e081f224b6 Implemented a very basic PCMTrack test, nevertheless revealing an oversight in PCMSegmentEventSource related to improperly counting to the index hole if the final bit is set. Took that as a message that I should comment and document the event source. 2016-12-18 22:53:24 -05:00
Thomas Harte
a6354ebb01 Reimplemented PCMTrack to use PCMSegmentEventSource, eliminating code duplication. 2016-12-18 21:37:05 -05:00
Thomas Harte
f9a5595dad Added seeking tests, correcting such errors as uncovered. 2016-12-18 10:19:24 -05:00
Thomas Harte
3297f6d545 Made an attempt to implement seek_to on PCMSegmentEventSource, taking account of off-by-half counting. 2016-12-17 22:44:33 -05:00
Thomas Harte
3116a2cf4c Realised I was actually testing PCMSegmentEventSource, not PCMSegment; implemented a spread of tests; hence fixed PCMSegmentEventSource. 2016-12-17 21:47:13 -05:00
Thomas Harte
254cc41fd6 Made an attempt to separate and isolate the stuff of creating flux events from a PCMSegment, eventually to factor that out of PCMTrack and make it available also to PCMPatchedTrack. 2016-12-17 21:13:57 -05:00
Thomas Harte
313db75303 Ensured the patchable track owns its underlying track. 2016-12-17 18:17:22 -05:00
Thomas Harte
f1a08b7ab5 Opted to pass times by reference and added enough to PCMPatchedTrack that it could start being used by the disk controller, albeit that it doesn't work. 2016-12-17 16:26:45 -05:00
Thomas Harte
dc08a23ceb This is going to be a slow walk, I think. This class attempts to be the scratchpad which will hold in-memory track modifications. 2016-12-16 19:20:38 -05:00
Thomas Harte
c4041b06a8 This'll do as a write interface, won't it? 2016-12-07 22:19:20 -05:00
Thomas Harte
3f7f2c6117 'Tape' has joined the new underscore orthodoxy. 2016-12-03 12:05:19 -05:00
Thomas Harte
0dc2aa6454 Commuted all of 'Storage' other than 'Tape' to postfix underscores. 2016-12-03 11:59:28 -05:00
Thomas Harte
81ee834530 As well as a bunch of logging, reinstated rotation position preservation across tracks. 2016-12-02 18:36:47 -05:00
Thomas Harte
93c573bfa9 Implemented missing status bits (other than the index hole), and a head loading delay for the Microdisc. 2016-12-01 21:13:16 -05:00
Thomas Harte
2222cb65d6 Split the status up into flags, assembled into a register upon demand. Attempted to implement some of the differences between the 1770/1772 and 1773/1793. Albeit with a motor fix still in place. 2016-11-30 22:26:02 -05:00
Thomas Harte
f44542c18c Improved naming: this now explains what, not the mechanics of how. 2016-11-26 23:35:11 +08:00
Thomas Harte
5c8ecd3051 It probably needs a better name, but hastily implemented track caching at the Disk level. 2016-11-26 14:27:06 +08:00
Thomas Harte
2f86b07cfa Added a parser for Oric-format MFM disks. Causing my first disk to load! 2016-11-26 13:40:10 +08:00
Thomas Harte
dcfdd73077 Switched to more conventional runtime polymorphism, also now allowing encoders (shifters as were) to be obtained, as a slightly lower-level interface than vector-of-sectors. 2016-11-26 13:39:20 +08:00
Thomas Harte
b180f04c87 Okay, so this file format wasn't what I hoped it was. It's another hack. Lots of work to do. 2016-11-26 10:19:10 +08:00
Thomas Harte
7613755f94 Fixed addressing: types are 1 and 2, not 0 and 1. 2016-11-26 10:13:12 +08:00
Thomas Harte
8499783b14 Dragged multibyte primitives and signature checks up to the base class. Implemented support for Oric MFM-style .DSK, at the file format level. 2016-11-21 20:47:16 +08:00
Thomas Harte
31c2548804 Created a base class for the boilerplate fopen stuff, switched as many classes as possible to its use, switched to postfix underscores and non-camelCase names. 2016-11-21 20:14:09 +08:00
Thomas Harte
97811fe590 Made minor fix to ensure that a header that appears to extend beyond the end of an Oric .TAP doesn't create an ostensibly endless tape. 2016-11-15 12:02:03 +08:00
Thomas Harte
fce48b9b8c I am instructed that the Oric actually catches only positive transitions, and compares the distance between those to a threshold. So here's an altered version of the tape parser that does that. 2016-11-09 06:37:10 -05:00
Thomas Harte
c257e7f58d Implemented better sync-to-zero and discovered a header counting bug plus, probably, a misleading representation of gaps in the Oric TAP decoder. 2016-11-07 20:17:06 -05:00
Thomas Harte
80702616ea Had a quick go at using the Oric parser for static analysis. Found out that synchronisation is lost. Need to investigate. 2016-11-06 22:56:38 -05:00
Thomas Harte
7205c3f82b Made an attempt to build in Oric slow/fast detection. 2016-11-06 21:31:10 -05:00
Thomas Harte
d1ef2f7c63 Made an attempt to consolidate what I learnt of Oric encoding while building this hastily and untidily directly into the Oric implementation. 
(while adding support for the slow tape encoding mode)
 2016-11-06 19:22:09 -05:00
Thomas Harte
353c1c8ea3 Shifted ownership of PETSCII -> string conversion down to the storage layer, where it's useful for tape parsing. 2016-11-06 18:43:51 -05:00
Thomas Harte
1b15bc3a6c Started relocating the tape parsers down from static analyser to storage, to signify that they may be used by the emulation (if fast loading is supported on that machine). 2016-11-06 16:13:13 -05:00
Thomas Harte
827a919368 This is an initial attempt at reading actual tape data. It loses sync though. 2016-11-02 22:30:53 -04:00
Thomas Harte
d3634488e6 Made an attempt better to deal with multiple-file TAPs; also started using a zero level for the header/data gap. 2016-10-24 21:59:06 -04:00
Thomas Harte
cbbd31c2e0 Explained what this recently factored-out class does, and removed code from the header. 2016-10-20 19:33:25 -04:00
Thomas Harte
cc0b70828b Removed attempt at multiple-file logic, at least for the time being. Starting to wonder whether I actually need anything beyond a literal streaming of bytes? 2016-10-16 22:15:24 -04:00
Thomas Harte
fae1bb0db9 First successful game loaded! It turns out exactly one '$' is correct. Probably. 2016-10-15 21:49:41 -04:00
Thomas Harte
952a24f769 A quick hard-wiring of the OricTAP code to get the first file in a .tap correct, damn the rest, and I'm getting some on-screen feedback. Hooray! 2016-10-15 21:39:53 -04:00
Thomas Harte
a608bbebfb Performed enough wiring to put the onus back onto OricTAP to do appropriate things. 2016-10-15 21:32:59 -04:00
Thomas Harte
6d7c3f6ac2 Factored out the now-sampling binary-level tape player from the Vic and connected it up to the Oric. 2016-10-15 21:21:18 -04:00
Thomas Harte
4f78d693e9 Reintroduced gap as a string of 1s, made an attempt to look up bit ordering. Still unclear on high/low versus low/high. 2016-10-11 08:07:51 -04:00
Thomas Harte
70f004efbb This may be feeding bits in the wrong direction or calculting the wrong parity or doing something else amiss but should now be correct as to bytes. 2016-10-11 07:57:10 -04:00
Thomas Harte
df01c78039 It's a bit of a mess but this is probably close to appropriate for Oric TAP files. 2016-10-11 07:39:48 -04:00
Thomas Harte
abf47efd40 Factored out Commodore is-a-ROM test, allowing it to be used from the Commodore analyser and thereby allowing ROMs to get as far as the machine again. 2016-09-29 19:39:13 -04:00
Thomas Harte
4010f36238 Ensured tape-formatted PRGs reach a conclusion. 2016-09-29 19:12:26 -04:00
Thomas Harte
ca53fac732 Switched to assuming a single-sided disk, moved out magic constants. 2016-09-26 21:20:30 -04:00
Thomas Harte
572d5587d9 Made a first stab at enabling multi-disk machines and thereby obeying (some of) the Plus 3's status register. 2016-09-25 21:24:16 -04:00
Thomas Harte
9bbcbd1001 Renamed class, intending to turn a Disk::Drive into literally just that, and have a thing with a PLL that consumes events be a Controller. 2016-09-25 20:05:56 -04:00
Thomas Harte
523dbb9678 This'll do for getting the ADF into the machine. 2016-09-25 18:32:26 -04:00
Thomas Harte
de863719d0 Made a first attempt at Acorn ADFS support plus the start of a suitable analyser. 2016-09-25 17:46:11 -04:00
Thomas Harte
a9e65e9b7a Tweaked disk side density, added call-outs to a WD1770 if the Electron had one (albeit without run_for_cycles yet as I need to figure out the clock rate), added a shell of the basic functions of the WD1770. No implementation yet. 2016-09-19 22:06:56 -04:00
Thomas Harte
64f2538b1f Added CRC checking to DFS comprehension; fixed a bunch of places where I'd used Objective-C's #import rather than #include. 2016-09-19 08:16:06 -04:00
Thomas Harte
8a1b805d11 Fixed file offset calculation for single-sided images. 2016-09-19 07:34:10 -04:00
Thomas Harte
b1e7f2dfd0 There's no cache and no CRC checking yet, but this is probably a rough outline of an FM parser. 2016-09-18 22:03:06 -04:00
Thomas Harte
d1c861d3a5 That should be that, I hope. 2016-09-18 21:09:32 -04:00
Thomas Harte
02c9a82cb5 Edging towards SSD/DSD support. Hold on! 2016-09-18 19:32:08 -04:00
Thomas Harte
91cd7e143b Started on the SSD/DSD support. Realised I had ommitted multiple head support from my disk class. Fixed that. 2016-09-18 19:21:02 -04:00
Thomas Harte
5409c8ec54 Switched PCMSegments to std::vector; ensured generated [M]FM tracks are correctly sized, thereby making sure the individual flux windows will be correctly sized. 2016-09-18 18:56:35 -04:00
Thomas Harte
d9aaf456f0 Adapted pervasively to MSB-first output. Which seems to be correct. 2016-09-18 18:46:58 -04:00
Thomas Harte
180c3df2d4 Calling it 'number theory' probably isn't accurate but extracted the CRC stuff and started using it for [M]FM encoding. 2016-09-18 18:33:26 -04:00
Thomas Harte
55a7418cbf Parameterised to perform FM and MFM encodings, at least subject to CRCs still being missing. 2016-09-18 17:16:20 -04:00
Thomas Harte
22eed60d2b Started sketching out basic MFM track encoding. Which possibly even means that the shifters don't need to be public? 2016-09-18 16:53:21 -04:00
Thomas Harte
0089c830c6 This possibly correctly encapsultes the lowest level of FM and MFM rules. 2016-09-18 14:17:06 -04:00
Thomas Harte
bcf91de7e9 Declared support for the Acorn disk files, started hammering out an encoder. 2016-09-18 13:35:54 -04:00
Thomas Harte
6454508db8 Added a quick bit of documentation. 2016-09-18 10:30:52 -04:00
Thomas Harte
65b568003d Clarified TODO. 2016-09-18 10:29:45 -04:00
Thomas Harte
8c2bf099ad Cut down to one GCD and clarified variable names, getting more explicit about what's going on. 2016-09-18 10:24:09 -04:00
Thomas Harte
79ef38b123 Attempted to use the new get_cycles_until_next_event method to take some repetition outside of the PLL and drive event loops. 2016-09-17 22:02:38 -04:00
Thomas Harte
dbb758aaf1 Workaround for a weird bug that suddenly appears to manifest: gzgetc is returning the file name, not bytes from the file. Seems to be related to improper initialisation of the next field within the gzFile header. I can't immediately see where ZLib intends to do that so it's a bit mysterious. But the larger-than-8 readers could probably save time by reading in blocks anyway. 2016-09-17 22:01:25 -04:00
Thomas Harte
14a9edcf5d Made an attempt to do the time base conversion upfront, saving a lot of hassle and allowing greater prediction. 2016-09-17 19:52:27 -04:00
Thomas Harte
9d6dcb80a7 Started work on a GCR parser and the helper functions that lie behind that. 2016-09-13 21:53:36 -04:00
Thomas Harte
e3571e8b9e Added insurance against an infinite loop should the tape be exhausted. 2016-09-12 22:22:23 -04:00
Thomas Harte
eeec516fa6 Implemented seeking on tapes, mucked about a bit more with the Commodore analyser, at least temporarily removed cropping from the Vic emulator. 2016-09-11 17:09:00 -04:00
Thomas Harte
1de6097f06 Shuffled C stuff out on top. 2016-09-08 21:08:03 -04:00
Thomas Harte
24251a2768 Negligible indentation fix. 2016-09-08 07:49:43 -04:00
Thomas Harte
01e5dae512 Threw in 300-baud support. Why not? 2016-09-08 07:48:20 -04:00
Thomas Harte
3e925e80a3 Added a field-filling constructor for pulses. 2016-09-08 07:41:44 -04:00
Thomas Harte
1e7b5330f5 More or less rewrote, to use a filled-per-chunk buffer of upcoming pulses rather than working them out as requests come. Which is more straightforward — all the code for a particular chunk goes in exactly one place — and much easier to extend. So threw in a provisional 0104 implementation. 2016-09-08 07:41:26 -04:00
Thomas Harte
d7d5f24aab Attempted, at least, to insert a dummy byte as per the specification. 2016-09-06 21:51:04 -04:00
Thomas Harte
11850b872d Sought to emulate 0111 as a longer 0110 to test a particular HQ UEF. Some progress. Not great. 2016-09-05 18:28:43 -04:00
Thomas Harte
21e5f407d8 I need to get a bit more definitive on naming but this gets all the way to setting a configuration upon an Electron. 2016-08-31 22:03:42 -04:00
Thomas Harte
963a479908 Made a quick first attempt at getting a file name from Acorn tape, failing terribly but at least formalising tapes being able to signal their end. 2016-08-29 21:53:06 -04:00
Thomas Harte
d1abfc040c Addressed my dithering here: the file format containers themselves should do nothing but inspect the data to find out whether it is of the correct format. The machine steps are there for machine-specific validation. So it's probably easier to treat a binary ROM image just as a binary ROM image. Therefore, the Acorn-specific .rom detection is now in an Acorn-specific area. 2016-08-29 08:48:49 -04:00
Thomas Harte
29c972f4b8 Added hacky segue into analysis for all Electron formats. Added analyser to try to differentiate Acorn-format ROMs from other things called .rom, which are likely to be numerous. 2016-08-28 12:43:17 -04:00
Thomas Harte
d9f0065154 Sketched out just enough classes to get through the get-contents-into-memory step of static analysis. 2016-08-28 12:20:40 -04:00
Thomas Harte
24938326ac ROMs definitely have no behaviour other than responding to memory accesses. Cartridges might. So picked the more general term. Sketched out a class at least to parse PRG as though it were a cartridge. Hence the static analyser can guess at whether a PRG is a cartridge or an ordinary program. 2016-08-27 18:26:51 -04:00
Thomas Harte
a1b3a18d11 Started forcing a resolution on ROMs by doing. But have immediately misstepped. Rename coming momentarily... 2016-08-27 18:17:40 -04:00
Thomas Harte
82c8459055 Minor tidying of namespace usage declarations. 2016-08-27 17:18:12 -04:00
Thomas Harte
56c0d70c1f Gave disks their own namespace. 2016-08-27 17:15:09 -04:00
Thomas Harte
c0402d0c2b Gave tapes their own namespace. 2016-08-27 17:09:45 -04:00
Thomas Harte
8c333059a8 Turning this into a slog: gave UEF a more appropriate name, got as far as now having to decide what to do about ROMs as to structure. I guess they're machine specific, so specific classes? 2016-08-27 16:40:21 -04:00
Thomas Harte
73ce67bee8 Added some documentation of the intention here. 2016-08-19 11:04:59 -04:00
Thomas Harte
4edd1214f1 This has now successfully loaded its first PRG-as-a-tape. 2016-08-19 10:58:42 -04:00
Thomas Harte
2935848f35 Adopted header/header/data/data pattern. But still not complete joy. 2016-08-17 08:03:34 -04:00
Thomas Harte
e5523dbbed This gets through loading the first(/only?) copy. I tried repeating it with a bit-flipped header, now I'm trying repeating the header with a different file type. More documentation searching to do, I guess. 2016-08-16 22:17:08 -04:00
Thomas Harte
1bca9aa2bb Fixed parity: now calculated from the actual byte and works the other way around. The Vic now believes it is loading the actual program. So I guess bytes, headers and the lead-in is working. 2016-08-16 21:41:09 -04:00
Thomas Harte
dfe9fb83ef This proves that bytes are being deposited properly. For the first 36 anyway, and with no announcement. 2016-08-16 21:09:50 -04:00
Thomas Harte
12f8aff65b Lengths I'd taken seem to have been for dipoles, not single poles. So I just doubled the clock rate. Also I was producing each dipole as high then low, when they should probably be low then high. The Vic now at least recognises that something is happening on the tape. 2016-08-16 19:46:53 -04:00
Thomas Harte
3a23d5d8cf Adjusted the check digit. 2016-08-15 22:44:36 -04:00
Thomas Harte
dbe47f3f45 I've obviously misunderstood something as, as far as I'm concerned, this should at least get me a 'LOADING'. 2016-08-15 22:40:05 -04:00
Thomas Harte
7994148f55 I'm starting to make a little headway, I think: this performs lead-ins and countdowns, though with no actual data or anything as helpful as that. 2016-08-15 22:10:53 -04:00
Thomas Harte
7e2b4554ea This likely forms the Commodore dipoles correctly. It just stays stuck in leader tone forever is all. 2016-08-15 20:08:50 -04:00
Thomas Harte
38aec44d85 Made sufficient changes for the Vic itself to believe it can recast a PRG as a tape and insert it that way. So now the ball is in the court of: how the heck are Commodore tapes encoded? 2016-08-15 19:44:41 -04:00
Thomas Harte
3aa40212f3 Fixed minor documentation error; admitted that this class didn't invent the idea of a pulse. 2016-08-15 19:37:21 -04:00
Thomas Harte
9d76cd9b60 Removed dead instance storage. 2016-08-04 21:41:12 -04:00
Thomas Harte
3e90b85ff8 Made an attempt to insert proper conversions to/from rotational speed. The Time class is now really turning into a full-on quotient. Might need refactoring. 2016-08-04 21:36:39 -04:00
Thomas Harte
e57ab1025d Fixed location calculation, up to a point. 2016-08-03 22:33:00 -04:00
Thomas Harte
9af9b28baf Made very first attempt at closing the loop on this. But it's time for work. 2016-08-03 08:16:23 -04:00
Thomas Harte
e15241dc3c Added ability to query how long since the new interval was set to the timed event loop. Discovered that LCM will returning the net effect of the common factors only. Otherwise continued iterating towards time preservation. 2016-08-03 07:49:00 -04:00
Thomas Harte
a3a3486f54 Okay, it's becoming more apparent where the (very mild) complexity will be here. But started moving towards retaining rotation between tracks. 2016-08-03 07:33:26 -04:00
Thomas Harte
21f1fa37a4 Fixed Time addition, added accumulation of distance into track into the disk drive, added a short circuit for LCM. 2016-08-03 07:26:05 -04:00
Thomas Harte
30f8b6baa4 Made an attempt to add the necessary extension to Track, with a concrete implementation in PCMTrack, to support time-based seeking, the intended mechanism for not magically spinning the disk back to the index hole upon every head step. 2016-08-03 06:59:45 -04:00
Thomas Harte
d832e5e10d Reduced 1540 PLL to running at 4Mhz. Which is possibly correct (?) Made minor change to avoid divide if possible. 2016-08-02 21:28:50 -04:00
Thomas Harte
bc10b3ee9a It appears the problem is as simple as sectors being counted from zero. 2016-08-01 10:08:38 -04:00
Thomas Harte
f5e4ea3351 Some minor tidying, lots more of the caveman stuff as I try to determine what I'm doing wrong. 2016-08-01 09:43:08 -04:00
Thomas Harte
a00f9adba3 Made a first attempt at D64 support. Made an error somewhere but this should be 90% of it. 2016-08-01 08:41:16 -04:00
Thomas Harte
58297f1baf Performed the basic metadata and routing for opening D64 files. Realised that I wasn't actually necessarily catching exceptions properly for all file opens, and fixed. 2016-08-01 07:09:15 -04:00
Thomas Harte
ee2a7c9415 Added slightly to exposition, to match other formats. 2016-08-01 06:54:57 -04:00
Thomas Harte
2799a87218 Reduced possibility of overflow on LCM, improved commenting widely, removed one stale piece of G64 bootstrapping caveman stuff. 2016-08-01 06:04:55 -04:00
Thomas Harte
198fbbedc7 Reeled back all appropriate pieces of caveman debugging. 2016-07-31 13:42:34 -04:00
Thomas Harte
2332f72875 Formalised clock-rate multiplication within disk drives, discovered that the stepper didn't have ideal behaviour for my timed event loop and hence nailed down the semantics a ilttle more. 
(obiter: the 1540 now appears to discern the correct sequence of bits. Framing is off in my test printfs but that's neither here nor there).
 2016-07-31 13:32:30 -04:00
Thomas Harte
6ee784a893 Increased logging; discovered I was packing events together too closely. Now getting some zeros. 2016-07-30 04:30:55 -04:00
Thomas Harte
fead524eb5 Attempted to give the PLL a litte extra leeway, and fixed PCMTrack length test. 2016-07-29 18:52:50 -04:00
Thomas Harte
8f62211f5e Wired up the 1540 as a PLL delegate. Which prima facie means it should start receiving a bit stream. Except that I clearly have something in the timing way off — either my flux transitions are far too short or I need to significantly increase the clock rate on the PLL. 2016-07-29 12:08:18 -04:00
Thomas Harte
89a1881fef Started turning the 1540 into an actual disk drive. 2016-07-29 11:03:09 -04:00
Thomas Harte
6532b3a8c8 Filled in a calculation of clocks per bit that'll do. 2016-07-29 07:51:07 -04:00
Thomas Harte
f984de42a3 Took some small steps towards having a disk drive that at least can select a track and pump relevant events into a PLL. 2016-07-29 07:31:02 -04:00
Thomas Harte
0e581c7607 Factored out the stuff of running a timed event loop from the TapePlayer. 2016-07-29 07:15:46 -04:00
Thomas Harte
e55db0cfe8 Made an attempt to eliminate creeping tape processing accuracy misses, which implied factoring out the GCM and LCD functions, which I then felt didn't really amount to signal processing. 2016-07-29 05:19:01 -04:00
Thomas Harte
5c1614ce7b Attempted to simplify, very slightly. 2016-07-28 14:35:39 -04:00
Thomas Harte
015cea494d Switched to a much-more straightforward PLL. I think I'm just fiddling now rather than moving forwards. Probably time to move on? 2016-07-28 11:32:14 -04:00
Thomas Harte
e061e849d4 Had a second bash at the PLL. Probably I should read some of the literature. 2016-07-27 16:24:24 -04:00
Thomas Harte
63f39608a6 Added just enough to get back to a working build. 2016-07-15 20:35:19 -04:00
Thomas Harte
165dbd9651 Started fleshing this out a bit. Hopefully. 2016-07-15 08:28:34 -04:00
Thomas Harte
0aa90b943b Switched to specifying bit length as a quotient for the purposes of a PCMSegment and verified that I had the logic for picking a Commodore time zone backwards: bigger numbers are faster, not slower. 
Started sketching out a DiskDrive class.
 2016-07-15 06:51:11 -04:00
Thomas Harte
6afd619791 Eliminated floating point arithmetic. 2016-07-14 19:47:00 -04:00