Thomas Harte
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f94f34f053
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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.
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2017-01-01 20:39:19 -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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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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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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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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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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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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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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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
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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
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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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d4a1961378
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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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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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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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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.
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2016-09-25 14:11:22 -04:00 |
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Thomas Harte
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d50629e6aa
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This is clearly the winning solution. Edited down.
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2016-09-24 22:36:38 -04:00 |
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Thomas Harte
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1b69ad0fd4
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This attempts to implment sector reading. DFS reports an error.
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2016-09-24 22:29:02 -04:00 |
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Thomas Harte
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ce4100e5b9
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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.
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2016-09-24 22:04:54 -04:00 |
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Thomas Harte
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53522e28e2
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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.
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2016-09-24 20:12:45 -04:00 |
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Thomas Harte
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75eb62b577
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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.
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2016-09-22 21:25:31 -04:00 |
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Thomas Harte
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8db0030068
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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.
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2016-09-20 22:14:33 -04:00 |
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Thomas Harte
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7a34ae0da6
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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.
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2016-09-20 16:58:23 -04:00 |
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Thomas Harte
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3b97b038b9
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Corrected and sketched out state machine far enough to get to a complaint about unhandled work.
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2016-09-20 15:56:31 -04:00 |
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Thomas Harte
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a9e65e9b7a
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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.
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2016-09-19 22:06:56 -04:00 |
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Thomas Harte
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bcf91de7e9
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Declared support for the Acorn disk files, started hammering out an encoder.
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2016-09-18 13:35:54 -04:00 |
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Thomas Harte
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e3daf80564
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Added a file for the 1770, at least.
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2016-09-17 18:01:00 -04:00 |
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