Thomas Harte
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46a93d2e12
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Fixed errors to ensure that FM disks, at least, follow the same CRC generation rules when being built from sectors and when being parsed.
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2016-12-28 19:48:46 -05:00 |
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Thomas Harte
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1277a67f9a
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Introduced data_mode_ to replace is_reading_data_, representing that there are now three possible modes. When writing, any input from the read head won't affect the CRC generator.
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2016-12-28 19:26:21 -05:00 |
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Thomas Harte
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720b1e5802
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Attempted to ensure proper CRC generation for FM-format input.
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2016-12-28 18:56:53 -05:00 |
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Thomas Harte
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8cd1575891
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Similar fix to that over in Oric land: ensure a known, effective initial value for the Plus 3's control register.
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2016-12-28 18:52:36 -05:00 |
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Thomas Harte
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3a9ad3fb08
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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.
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2016-12-28 18:50:28 -05:00 |
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Thomas Harte
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90151e2094
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Fixed to ensure a known initial control register value, which has taken effect.
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2016-12-28 18:49:32 -05:00 |
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Thomas Harte
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7a627b782d
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Reintroduced writing of MFM sync marks when writing a sector.
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2016-12-28 18:48:50 -05:00 |
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Thomas Harte
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a568172758
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Made steps towards proper CRC generation. Am currently comparing against Oric disk images, as — amongst other things — they include precomputed CRCs.
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2016-12-28 18:29:37 -05:00 |
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Thomas Harte
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99993a1b24
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Since it's about to become important that objective results match, added a couple of objective-result tests for the CRC generator.
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2016-12-27 19:03:46 -05:00 |
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Thomas Harte
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9c0f622a2e
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Started working CRC checking into the 1770. Discovered immediately that my generated CRC does not match that built into the Oric disk images. So mine is pretty-much certainly wrong. An opportunity for learning!
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2016-12-26 16:46:26 -05:00 |
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Thomas Harte
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0490a47058
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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.
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2016-12-26 14:24:33 -05:00 |
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Thomas Harte
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83c433c142
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Deviated from the data sheet, which seems likely to be correct. Hence removed a whole load of the temporary logging.
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2016-12-26 12:48:49 -05:00 |
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Thomas Harte
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742c5df367
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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.
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2016-12-25 22:00:39 -05:00 |
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Thomas Harte
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b538ee5bd8
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Fixed discovery of correct active period and setting of track time, when seeking.
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2016-12-25 21:32:50 -05:00 |
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Thomas Harte
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a6d038cad9
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Eliminated special case that doesn't seek properly and isn't needed. Added TODO.
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2016-12-25 21:32:14 -05:00 |
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Thomas Harte
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4fca30b81f
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Made the Plus 3 less chatty, documented invalidate_track.
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2016-12-25 21:06:58 -05:00 |
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Thomas Harte
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26710c988d
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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.
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2016-12-25 20:40:06 -05:00 |
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Thomas Harte
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acc35885cd
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Attempted to reduce track invalidations.
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2016-12-25 20:38:25 -05:00 |
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Thomas Harte
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c0a1264ab0
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Slightly improved legibility.
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2016-12-25 20:19:47 -05:00 |
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Thomas Harte
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e2b829f68e
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Made an attempt to write the proper address mark.
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2016-12-25 20:15:07 -05:00 |
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Thomas Harte
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beaa868079
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Factored the MFM parser out into encodings.
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2016-12-25 20:00:57 -05:00 |
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Thomas Harte
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1349e85d83
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[Mostly] fixed track write-back.
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2016-12-25 19:19:22 -05:00 |
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Thomas Harte
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74e98fd097
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Made an attempt to write actual data (albeit that CRC calculation is still missing).
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2016-12-25 19:18:45 -05:00 |
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Thomas Harte
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007c13ec16
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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.
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2016-12-25 16:35:39 -05:00 |
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Thomas Harte
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98be6ede45
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Shuffled a little to reduce risk of overflow, ensured writing is a loop, still seem to be writing too quickly for some reason.
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2016-12-25 16:13:05 -05:00 |
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Thomas Harte
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d2ad2c756e
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Added enough shovelling to write rubbish for an entire sector.
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2016-12-25 15:46:49 -05:00 |
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Thomas Harte
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ec55a25620
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It makes sense to simplify these ahead of time.
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2016-12-25 12:32:25 -05:00 |
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Thomas Harte
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aceb7e3b6b
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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.
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2016-12-25 12:31:38 -05:00 |
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Thomas Harte
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901f19f89c
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Added enough stuff that SSDs attached to a 1770 will now reach the entry point for writing.
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2016-12-25 09:46:12 -05:00 |
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Thomas Harte
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e56beb3e9c
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Merge pull request #86 from TomHarte/DiskWrites
Implements backing work for in-memory disk writes
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2016-12-25 09:37:20 -05:00 |
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Thomas Harte
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9d555c4a02
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Let's try just declining to pump the PLL while in write mode. Added documentation to explain.
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2016-12-25 09:19:18 -05:00 |
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Thomas Harte
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b57038edc5
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Actually, at least index holes will still be receivable while writing, so this wasn't entirely correct. Probably best to leave it in.
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2016-12-25 09:16:09 -05:00 |
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Thomas Harte
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d606bd7ce5
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Added saturation test, fixed code as indicated.
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2016-12-24 23:29:37 -05:00 |
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Thomas Harte
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09ff9d6a26
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Introduced a couple more floating-point conversion tests, fixed errors uncovered.
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2016-12-24 23:21:19 -05:00 |
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Thomas Harte
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e25195a718
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Added a single test for Storage::Time, discovering that I had the wrong sign on float conversions.
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2016-12-24 22:59:01 -05:00 |
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Thomas Harte
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af69b21033
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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.
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2016-12-24 22:51:26 -05:00 |
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Thomas Harte
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f601d796f5
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Added documentation.
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2016-12-24 22:37:20 -05:00 |
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Thomas Harte
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6e94d0c19f
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Extended Storage::Disk::Disk to permit write-back of modified tracks, exposed some interface via Storage::Disk::Drive.
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2016-12-24 22:11:31 -05:00 |
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Thomas Harte
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7f303cfceb
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Continued the baby steps.
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2016-12-24 21:54:43 -05:00 |
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Thomas Harte
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afc6f4129c
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Withdrew unused tally.
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2016-12-24 21:47:57 -05:00 |
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Thomas Harte
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1e416d4af0
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Withdrew now-unused and never-implemented API from TimedEventLoop, and the redundant track time count from DiskController.
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2016-12-24 21:02:10 -05:00 |
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Thomas Harte
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bedea48d03
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This is a much better way of dealing with being partway into an incoming event. Subject to eliminating overruns, of course.
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2016-12-24 20:54:27 -05:00 |
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Thomas Harte
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4cb17143ef
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Messing around trying to lock down timing precisely. Which includes formal initial conditions.
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2016-12-24 15:18:46 -05:00 |
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Thomas Harte
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4d4852bb78
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Ensured that Times start life in their simplest form.
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2016-12-24 15:18:03 -05:00 |
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Thomas Harte
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4728bda0a2
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Added an additional constructor to make sure that regular ints go to the correct place.
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2016-12-24 13:27:57 -05:00 |
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Thomas Harte
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1e970a9772
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Started stepping slowly towards allowing writing on the disk controller, taking the opportunity to introduce self-simplifying behaviour to Storage::Time.
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2016-12-24 13:07:23 -05:00 |
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Thomas Harte
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42f25cdffc
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Merge branch 'master' into DiskWrites
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2016-12-22 22:47:19 -05:00 |
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Thomas Harte
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393dc5c64f
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Merge pull request #87 from TomHarte/ElectronVideoFix
Ensures the Electron's video base address is set properly at construction.
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2016-12-22 22:46:55 -05:00 |
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Thomas Harte
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3805e3d17d
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Ensured base address is set properly at construction.
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2016-12-22 22:46:02 -05:00 |
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Thomas Harte
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7028f57336
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Simplified a little further.
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2016-12-22 18:13:10 -05:00 |
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