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
