140 Commits

Author	SHA1	Message	Date
Thomas Harte	d7c0c49715	Might as well be consistent with divider loads.	2016-10-21 20:07:14 -04:00
Thomas Harte	782ef960e1	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.	2016-10-21 20:05:38 -04:00
Thomas Harte	cd59eb5f43	Implemented non-linear volume.	2016-10-19 23:07:51 -04:00
Thomas Harte	b59da7d4bc	Added some documentation.	2016-10-19 22:47:44 -04:00
Thomas Harte	08275c6241	Fixed mixer IO bit usage.	2016-10-19 22:22:15 -04:00
Thomas Harte	59162228ef	Reduced mask for clarity.	2016-10-19 22:14:05 -04:00
Thomas Harte	319d7c2b12	Fixed premature wrapping of the envelope, played about with whether that should be subject to a predivision by 256. It feels unlikely?	2016-10-19 22:12:51 -04:00
Thomas Harte	6073906c39	Commented and fixed mistake that would equate any noise divider > 32768 with 0.	2016-10-19 21:51:35 -04:00
Thomas Harte	101f168ea4	Made an attempt to tidy up.	2016-10-19 21:43:18 -04:00
Thomas Harte	ada37abe23	Made an attempt to implement noise and envelopes. Not quite right yet.	2016-10-19 21:13:22 -04:00
Thomas Harte	bd6e6674a0	Fixed signed shift assumption and noise-related register test.	2016-10-18 22:20:12 -04:00
Thomas Harte	9669a5ec9b	Switched to a more authentic interfacing to the AY.	2016-10-18 19:32:15 -04:00
Thomas Harte	43612e1ca2	Made an attempt to eliminate conditionals (running before I can walk?) and started edging towards an envelope generator.	2016-10-17 08:03:38 -04:00
Thomas Harte	9730e8247f	Ensured propagation of synchronise messages, added enough to do plain tone. Probably. So: noise and envelopes missing. And it's all far too quiet.	2016-10-15 21:04:21 -04:00
Thomas Harte	51bdac27ae	Made some AY advances; it's now being polled for samples and collecting more information on what it needs to output.	2016-10-15 17:45:39 -04:00
Thomas Harte	288d10c253	Got some keyboard reaction.	2016-10-14 21:44:15 -04:00
Thomas Harte	138eabcff4	Continued in my effort to wire up a keyboard. Will need further to continue.	2016-10-14 21:35:15 -04:00
Thomas Harte	d8e4c488c2	Started iterating towards having an AY and a fully-working keyboard.	2016-10-14 21:18:03 -04:00
Thomas Harte	922dd6a586	Hit up the other two kinds of audio generator.	2016-10-07 17:10:00 -04:00
Thomas Harte	79412dc84d	Upped MFM clock cycles, switched back to using the typer for the ADFS and adjusted ADFS ROM slots.	2016-09-28 21:28:34 -04:00
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	6330e5706c	Fixed seek verify. First ADFS directory is visible.	2016-09-25 21:44:46 -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	572d5587d9	Made a first stab at enabling multi-disk machines and thereby obeying (some of) the Plus 3's status register.	2016-09-25 21:24:16 -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	a538b45213	Sought to implement the verify step of type 1 commands.	2016-09-25 09:54:49 -04:00
Thomas Harte	0918751802	Fixed stepping out.	2016-09-24 22:48:45 -04:00
Thomas Harte	9e1d4c8b01	Fixed an initial setup error with seek.	2016-09-24 22:43:12 -04:00
Thomas Harte	d50629e6aa	This is clearly the winning solution. Edited down.	2016-09-24 22:36:38 -04:00
Thomas Harte	07ff5138b7	The catalogue now loads.	2016-09-24 22:35:34 -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	7154e8986e	Fixed stepping delay.	2016-09-24 20:16:23 -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	88bbeedad3	Set actual bit length.	2016-09-22 21:28:23 -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
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
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
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