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
Thomas Harte
6b4fec37ff
Moved down to a single divide.
2016-07-14 19:45:08 -04:00
Thomas Harte
481475a0f4
Switched to a full-on linear regression. Which causes the current tests to pass.
2016-07-14 19:42:01 -04:00
Thomas Harte
6d6b26b99f
Actually made things worse.
2016-07-14 07:32:27 -04:00
Thomas Harte
d8d3464c56
Made a quick-hack attempt at PLL synchronisation. Which doesn't work.
2016-07-14 07:31:23 -04:00
