26 Commits

Author	SHA1	Message	Date
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	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	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	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	91235c7fd7	Fixed issue whereby parts of data that merely looked like index or ID address marks within tracks caused a resynchronisation of the tokeniser.	2016-09-27 07:36:37 -04:00
Thomas Harte	4db086949a	Made an attempt to add MFM decoding to the 1770; ensured something is returned when reading the Plus 3 status register again.	2016-09-25 21:38:52 -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	6084020ab3	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
Thomas Harte	d50629e6aa	This is clearly the winning solution. Edited down.	2016-09-24 22:36:38 -04:00
Thomas Harte	1b69ad0fd4	This attempts to implment sector reading. DFS reports an error.	2016-09-24 22:29:02 -04:00
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
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
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
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
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
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
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	bcf91de7e9	Declared support for the Acorn disk files, started hammering out an encoder.	2016-09-18 13:35:54 -04:00
Thomas Harte	e3daf80564	Added a file for the 1770, at least.	2016-09-17 18:01:00 -04:00