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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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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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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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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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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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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c304db0f5a
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Deintegrated the busy flag and the interrupt request line, as the latter is reset by status reads. Which also means I can start reporting the WD INTRQ line status directly from the Microdisc. That appears to be correct, rather than honouring the Microdisc IRQ select there.
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2016-12-06 21:16:29 -05:00 |
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Thomas Harte
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ca50606e1d
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Restored Vic audio.
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2016-12-03 17:10:47 -05:00 |
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Thomas Harte
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36bc558798
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Converted all 'Components' to postfix underscores.
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2016-12-03 10:51:09 -05:00 |
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Thomas Harte
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81ee834530
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As well as a bunch of logging, reinstated rotation position preservation across tracks.
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2016-12-02 18:36:47 -05:00 |
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Thomas Harte
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93c573bfa9
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Implemented missing status bits (other than the index hole), and a head loading delay for the Microdisc.
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2016-12-01 21:13:16 -05:00 |
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Thomas Harte
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0a0775c3bd
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Removed earlier hacky solution.
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2016-12-01 20:16:11 -05:00 |
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Thomas Harte
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442986ee2c
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Introduced a head loading path for 1793 machines.
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2016-12-01 20:12:22 -05:00 |
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Thomas Harte
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82899f2f47
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Ensured flag setting is atomic, removed duplication of interrupt request versus busy, found better names for the personality testers, unified delegate protocol.
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2016-12-01 07:41:52 -05:00 |
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Thomas Harte
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b31fd11470
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Fixed reporting of data request line, initial status values.
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2016-11-30 22:39:55 -05:00 |
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Thomas Harte
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2222cb65d6
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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.
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2016-11-30 22:26:02 -05:00 |
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Thomas Harte
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84cb07613d
|
Checked some documentation more thoroughly; the 1793 has quite different spin-up (/head load) semantics. So it's another distinct personality. Grrr.
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2016-11-27 20:39:08 -08:00 |
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Thomas Harte
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02ba1f220f
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The '72 seems to be a '70 with altered timing. So worth differentiating.
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2016-11-27 21:06:17 +08:00 |
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Thomas Harte
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2c01f9dbed
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Added meaningful TODOs.
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2016-11-27 08:42:39 +08:00 |
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Thomas Harte
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2f459690d4
|
It would appear the 1770 and 1773 actually differ in relation to the (non-sensical) ability not to spin-up for a Type 2, and whether a side compare can occur. So the WD1770 class now requires a personality to be specified. Which it singly fails to honour.
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2016-11-26 23:29:30 +08:00 |
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Thomas Harte
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d8ecc52de8
|
Temporarily disabled spin-down as harmful to the status register if following anything other than a Type 1 command.
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2016-11-26 22:27:20 +08:00 |
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Thomas Harte
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b9677c9927
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Consolidated interrupt request setting.
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2016-11-26 09:41:53 +08:00 |
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Thomas Harte
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d5f9e0aa3b
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Ensured there's no such thing as a zero-cycle operation, even if i don't yet know exactly what I should be doing.
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2016-11-25 21:24:25 +08:00 |
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Thomas Harte
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4af678d2ed
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Gave the Microdisc a clock signal, added just enough of force interrupt to avoid a spurious belief that a type 3 command has started.
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2016-11-25 20:51:39 +08:00 |
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Thomas Harte
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d4a1961378
|
Added getters for the IRQ and DRQ lines plus a delegate to receive changes; adjusted code so that the two lines signal.
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2016-11-21 13:21:49 +08:00 |
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Thomas Harte
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7eeaac23e7
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Reversed myself. I once again do not think the clock is divided by 256 for envelopes.
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2016-11-11 20:31:48 -05:00 |
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Thomas Harte
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77987bf31e
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Decided to go with divide by 256 for the envelope counter after all.
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2016-11-09 21:51:56 -05:00 |
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Thomas Harte
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77ce200fbb
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Simplified/corrected AY tone/noise mixer logic, and made a new guess at the effect of reading registers that are smaller than 8 bits.
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2016-11-09 21:21:17 -05:00 |
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Thomas Harte
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fa65cc2058
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Resolved type conversion error.
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2016-11-05 12:57:01 -04:00 |
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Thomas Harte
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30c670f8de
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Ensured programmatic setting of the timers occurs during phase 2 _instead_ of counting.
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2016-11-04 21:30:18 -04:00 |
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Thomas Harte
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21604376e6
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Reintroduced clocking of the AY and boxed in the range of the master divider a little further.
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2016-10-30 22:51:08 -04:00 |
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Thomas Harte
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ad00304e8a
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Fixed 6522 countdown.
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2016-10-28 21:05:42 -04:00 |
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Thomas Harte
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4fab794747
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Added a direct-to-two-cycles emulation path for 6522 owners.
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2016-10-27 21:13:25 -04:00 |
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Thomas Harte
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2eda0b3c86
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Attempted to simplify the logic behind the most common 6522 usage.
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2016-10-27 21:06:31 -04:00 |
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Thomas Harte
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fd823dc222
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Settled on terminology.
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2016-10-23 20:42:49 -04:00 |
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Thomas Harte
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b12f2f2796
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Switched to more straightforward version of two-step loop, dealing with my mistaken dealing of when _master_divider&15 == 0 upon entry without adding an extra sanity check. Am also temporarily on non-modulo logic for tone generation, for a profiling test.
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2016-10-23 20:32:48 -04:00 |
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Thomas Harte
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583db88299
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Added a dispatch queue-powered Apple implementation of the async task queue, removed any mention of skip_samples in the AY since it isn't implemented.
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2016-10-22 21:58:45 -04:00 |
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Thomas Harte
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33e628a096
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Made an attempt to eliminate what amounts to manual division.
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2016-10-21 22:16:44 -04:00 |
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Thomas Harte
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46a3c0922f
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Slightly simplified code, fixed divider.
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2016-10-21 22:12:44 -04:00 |
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Thomas Harte
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d7c0c49715
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Might as well be consistent with divider loads.
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2016-10-21 20:07:14 -04:00 |
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Thomas Harte
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782ef960e1
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Sought both to [start to] optimise the AY and correct divider reloads. It turns out that conditionals aren't that troubling. But I can probably eliminate the counters.
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2016-10-21 20:05:38 -04:00 |
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Thomas Harte
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cd59eb5f43
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Implemented non-linear volume.
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2016-10-19 23:07:51 -04:00 |
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Thomas Harte
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b59da7d4bc
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Added some documentation.
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2016-10-19 22:47:44 -04:00 |
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Thomas Harte
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08275c6241
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Fixed mixer IO bit usage.
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2016-10-19 22:22:15 -04:00 |
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Thomas Harte
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59162228ef
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Reduced mask for clarity.
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2016-10-19 22:14:05 -04:00 |
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Thomas Harte
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319d7c2b12
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Fixed premature wrapping of the envelope, played about with whether that should be subject to a predivision by 256. It feels unlikely?
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2016-10-19 22:12:51 -04:00 |
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Thomas Harte
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6073906c39
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Commented and fixed mistake that would equate any noise divider > 32768 with 0.
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2016-10-19 21:51:35 -04:00 |
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Thomas Harte
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101f168ea4
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Made an attempt to tidy up.
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2016-10-19 21:43:18 -04:00 |
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Thomas Harte
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ada37abe23
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Made an attempt to implement noise and envelopes. Not quite right yet.
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2016-10-19 21:13:22 -04:00 |
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Thomas Harte
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bd6e6674a0
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Fixed signed shift assumption and noise-related register test.
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2016-10-18 22:20:12 -04:00 |
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Thomas Harte
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9669a5ec9b
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Switched to a more authentic interfacing to the AY.
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2016-10-18 19:32:15 -04:00 |
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Thomas Harte
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43612e1ca2
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Made an attempt to eliminate conditionals (running before I can walk?) and started edging towards an envelope generator.
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2016-10-17 08:03:38 -04:00 |
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Thomas Harte
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9730e8247f
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Ensured propagation of synchronise messages, added enough to do plain tone. Probably. So: noise and envelopes missing. And it's all far too quiet.
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2016-10-15 21:04:21 -04:00 |
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Thomas Harte
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51bdac27ae
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Made some AY advances; it's now being polled for samples and collecting more information on what it needs to output.
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2016-10-15 17:45:39 -04:00 |
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Thomas Harte
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288d10c253
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Got some keyboard reaction.
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2016-10-14 21:44:15 -04:00 |
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Thomas Harte
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138eabcff4
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Continued in my effort to wire up a keyboard. Will need further to continue.
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2016-10-14 21:35:15 -04:00 |
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Thomas Harte
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d8e4c488c2
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Started iterating towards having an AY and a fully-working keyboard.
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2016-10-14 21:18:03 -04:00 |
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Thomas Harte
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922dd6a586
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Hit up the other two kinds of audio generator.
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2016-10-07 17:10:00 -04:00 |
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Thomas Harte
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79412dc84d
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Upped MFM clock cycles, switched back to using the typer for the ADFS and adjusted ADFS ROM slots.
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2016-09-28 21:28:34 -04:00 |
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Thomas Harte
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91235c7fd7
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Fixed issue whereby parts of data that merely looked like index or ID address marks within tracks caused a resynchronisation of the tokeniser.
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2016-09-27 07:36:37 -04:00 |
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Thomas Harte
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6330e5706c
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Fixed seek verify. First ADFS directory is visible.
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2016-09-25 21:44:46 -04:00 |
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Thomas Harte
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4db086949a
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Made an attempt to add MFM decoding to the 1770; ensured something is returned when reading the Plus 3 status register again.
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2016-09-25 21:38:52 -04:00 |
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Thomas Harte
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572d5587d9
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Made a first stab at enabling multi-disk machines and thereby obeying (some of) the Plus 3's status register.
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2016-09-25 21:24:16 -04:00 |
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Thomas Harte
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9bbcbd1001
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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.
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2016-09-25 20:05:56 -04:00 |
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Thomas Harte
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6084020ab3
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Added shift-break as a better way to boot suitable disks. Continued attempting to clean the 1770.
|
2016-09-25 14:11:22 -04:00 |
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Thomas Harte
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a538b45213
|
Sought to implement the verify step of type 1 commands.
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2016-09-25 09:54:49 -04:00 |
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Thomas Harte
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0918751802
|
Fixed stepping out.
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2016-09-24 22:48:45 -04:00 |
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Thomas Harte
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9e1d4c8b01
|
Fixed an initial setup error with seek.
|
2016-09-24 22:43:12 -04:00 |
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Thomas Harte
|
d50629e6aa
|
This is clearly the winning solution. Edited down.
|
2016-09-24 22:36:38 -04:00 |
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Thomas Harte
|
07ff5138b7
|
The catalogue now loads.
|
2016-09-24 22:35:34 -04:00 |
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Thomas Harte
|
1b69ad0fd4
|
This attempts to implment sector reading. DFS reports an error.
|
2016-09-24 22:29:02 -04:00 |
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Thomas Harte
|
ce4100e5b9
|
Fixed slots for DFS and ADFS to sideways RAM; continued working on the 1770 to get as far as trying to get the body of a sector.
|
2016-09-24 22:04:54 -04:00 |
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Thomas Harte
|
7154e8986e
|
Fixed stepping delay.
|
2016-09-24 20:16:23 -04:00 |
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Thomas Harte
|
53522e28e2
|
Performed an about-face on how this should probably be implemented. Now forsaking the state machine in favour of a macro'd switch-for-cooperative-event-based-messaging implementation. Let's see how this ends up looking.
|
2016-09-24 20:12:45 -04:00 |
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Thomas Harte
|
88bbeedad3
|
Set actual bit length.
|
2016-09-22 21:28:23 -04:00 |
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Thomas Harte
|
75eb62b577
|
One painful step at a time, this now starts the disk rotating and gets as far as deciding whether it's about to head off on a read or a write.
|
2016-09-22 21:25:31 -04:00 |
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Thomas Harte
|
8db0030068
|
Fixed ROM loading by the Electron, turned the WD1770 into a 'disk drive' (it'll do for now), persuaded it to get all the way through a very specifically convenient type 1 command.
|
2016-09-20 22:14:33 -04:00 |
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Thomas Harte
|
7a34ae0da6
|
This is the start of my slog through type 1 commands. I kind of need to figure out what I'm doing about drives and PLLs now though.
|
2016-09-20 16:58:23 -04:00 |
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Thomas Harte
|
3b97b038b9
|
Corrected and sketched out state machine far enough to get to a complaint about unhandled work.
|
2016-09-20 15:56:31 -04:00 |
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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 |
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Thomas Harte
|
bcf91de7e9
|
Declared support for the Acorn disk files, started hammering out an encoder.
|
2016-09-18 13:35:54 -04:00 |
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Thomas Harte
|
e3daf80564
|
Added a file for the 1770, at least.
|
2016-09-17 18:01:00 -04:00 |
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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
|
1541273785
|
Moved responsibility for throwing in a low-pass filter up to the Vic, appropriately.
|
2016-08-21 18:13:31 -04:00 |
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Thomas Harte
|
c783090980
|
It turns out that the Vic has a 1.6Khz low-pass filter. So added that.
|
2016-08-21 12:13:41 -04:00 |
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Thomas Harte
|
8d839c5278
|
I think this is correct. And have explained why.
|
2016-08-20 16:54:43 -04:00 |
|
Thomas Harte
|
7c9455251d
|
Fixed reload for the lower-frequency audio channels.
|
2016-08-19 17:34:01 -04:00 |
|
Thomas Harte
|
99157ad6b2
|
Ensured the 6560 knows its real audio clock on a PAL machine; removed some stray semicolons.
|
2016-08-19 13:35:34 -04:00 |
|
Thomas Harte
|
902c0f967a
|
Implements known phase pattern for PAL output.
|
2016-08-17 08:09:48 -04:00 |
|
Thomas Harte
|
142774be37
|
Collapsed 6560 template to a more direct loop, albeit with quite a bit still left to fix.
|
2016-08-09 21:10:53 -04:00 |
|
Thomas Harte
|
12bad8f23f
|
Turned the 6560 into an ordinary template, similar to the rest of the project, albeit right now with a fairly shonky internal implementation. Fixed a Mac-specific interface sizing issue.
|
2016-08-09 20:41:05 -04:00 |
|
Thomas Harte
|
3e65450a54
|
Converted the 6560 fully into a template; worked on allowing the typer to run at a much faster rate where hardware has some trigger by which it can request the next key.
|
2016-08-06 14:33:24 -04:00 |
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