200 Commits

Author	SHA1	Message	Date
Thomas Harte	ced644b103	It seems likely that an AY divides its clock by 8, not 16. I had conflated wave frequency and counter clock.	2017-01-11 22:03:01 -05:00
Thomas Harte	eca3995481	Added a CRC check for read address, ensured CRC, lost data and record not found are initially reset.	2017-01-01 21:00:25 -05:00
Thomas Harte	044c920a5b	Made it more explicit that there are no unhandled cases.	2017-01-01 20:56:52 -05:00
Thomas Harte	0df9ce5a76	Made an attempt at read address. So superficially that leaves only the force interrupts.	2017-01-01 20:55:09 -05:00
Thomas Harte	f94f34f053	Made an attempt at read track. Which means process_input_bit can't just swallow syncs any more; it now reports them as tokens of type ::Sync.	2017-01-01 20:39:19 -05:00
Thomas Harte	c994fa39f6	Ensured spin-up doesn't occur if there's no motor line.	2016-12-31 16:18:30 -05:00
Thomas Harte	1ea4f0d79d	Made an attempt to implement 'write track' and ensure that 'write sector' can't end without announcing that it has ended writing.	2016-12-31 16:01:44 -05:00
Thomas Harte	8eb21c6702	The "MFM...Byte"s aren't MFM-specific, they're relevant to both FM and MFM encoding. So renamed them. Also slimmed syntax within MFM.cpp mostly where emigration from the Acorn disk analyser had left a residue of lengthy namespace specification.	2016-12-31 15:25:11 -05:00
Thomas Harte	a8bc9d830e	Removed leftover very temporary debugging aid.	2016-12-28 23:03:05 -05:00
Thomas Harte	e4000bd060	Added some even more verbose logging; slightly simplified write loop logic, and decided it's definitely write_byte that's responsible for CRC generator feeding.	2016-12-28 21:24:19 -05:00
Thomas Harte	4adcb46665	Fixed FM-mode CRC generation.	2016-12-28 19:51:27 -05:00
Thomas Harte	1277a67f9a	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.	2016-12-28 19:26:21 -05:00
Thomas Harte	7a627b782d	Reintroduced writing of MFM sync marks when writing a sector.	2016-12-28 18:48:50 -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	9c0f622a2e	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!	2016-12-26 16:46:26 -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	83c433c142	Deviated from the data sheet, which seems likely to be correct. Hence removed a whole load of the temporary logging.	2016-12-26 12:48:49 -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	acc35885cd	Attempted to reduce track invalidations.	2016-12-25 20:38:25 -05:00
Thomas Harte	c0a1264ab0	Slightly improved legibility.	2016-12-25 20:19:47 -05:00
Thomas Harte	e2b829f68e	Made an attempt to write the proper address mark.	2016-12-25 20:15:07 -05:00
Thomas Harte	beaa868079	Factored the MFM parser out into encodings.	2016-12-25 20:00:57 -05:00
Thomas Harte	74e98fd097	Made an attempt to write actual data (albeit that CRC calculation is still missing).	2016-12-25 19:18:45 -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	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	c304db0f5a	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.	2016-12-06 21:16:29 -05:00
Thomas Harte	ca50606e1d	Restored Vic audio.	2016-12-03 17:10:47 -05:00
Thomas Harte	36bc558798	Converted all 'Components' to postfix underscores.	2016-12-03 10:51:09 -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	0a0775c3bd	Removed earlier hacky solution.	2016-12-01 20:16:11 -05:00
Thomas Harte	442986ee2c	Introduced a head loading path for 1793 machines.	2016-12-01 20:12:22 -05:00
Thomas Harte	82899f2f47	Ensured flag setting is atomic, removed duplication of interrupt request versus busy, found better names for the personality testers, unified delegate protocol.	2016-12-01 07:41:52 -05:00
Thomas Harte	b31fd11470	Fixed reporting of data request line, initial status values.	2016-11-30 22:39:55 -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	84cb07613d	Checked some documentation more thoroughly; the 1793 has quite different spin-up (/head load) semantics. So it's another distinct personality. Grrr.	2016-11-27 20:39:08 -08:00
Thomas Harte	02ba1f220f	The '72 seems to be a '70 with altered timing. So worth differentiating.	2016-11-27 21:06:17 +08:00
Thomas Harte	2c01f9dbed	Added meaningful TODOs.	2016-11-27 08:42:39 +08:00
Thomas Harte	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.	2016-11-26 23:29:30 +08:00
Thomas Harte	d8ecc52de8	Temporarily disabled spin-down as harmful to the status register if following anything other than a Type 1 command.	2016-11-26 22:27:20 +08:00
Thomas Harte	b9677c9927	Consolidated interrupt request setting.	2016-11-26 09:41:53 +08:00
Thomas Harte	d5f9e0aa3b	Ensured there's no such thing as a zero-cycle operation, even if i don't yet know exactly what I should be doing.	2016-11-25 21:24:25 +08:00
Thomas Harte	4af678d2ed	Gave the Microdisc a clock signal, added just enough of force interrupt to avoid a spurious belief that a type 3 command has started.	2016-11-25 20:51:39 +08:00
Thomas Harte	d4a1961378	Added getters for the IRQ and DRQ lines plus a delegate to receive changes; adjusted code so that the two lines signal.	2016-11-21 13:21:49 +08:00
Thomas Harte	7eeaac23e7	Reversed myself. I once again do not think the clock is divided by 256 for envelopes.	2016-11-11 20:31:48 -05:00
Thomas Harte	77987bf31e	Decided to go with divide by 256 for the envelope counter after all.	2016-11-09 21:51:56 -05:00
Thomas Harte	77ce200fbb	Simplified/corrected AY tone/noise mixer logic, and made a new guess at the effect of reading registers that are smaller than 8 bits.	2016-11-09 21:21:17 -05:00
Thomas Harte	fa65cc2058	Resolved type conversion error.	2016-11-05 12:57:01 -04:00