402 Commits

Author	SHA1	Message	Date
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	79ef38b123	Attempted to use the new get_cycles_until_next_event method to take some repetition outside of the PLL and drive event loops.	2016-09-17 22:02:38 -04:00
Thomas Harte	9d6dcb80a7	Started work on a GCR parser and the helper functions that lie behind that.	2016-09-13 21:53:36 -04:00
Thomas Harte	82c8459055	Minor tidying of namespace usage declarations.	2016-08-27 17:18:12 -04:00
Thomas Harte	56c0d70c1f	Gave disks their own namespace.	2016-08-27 17:15:09 -04:00
Thomas Harte	9d76cd9b60	Removed dead instance storage.	2016-08-04 21:41:12 -04:00
Thomas Harte	3e90b85ff8	Made an attempt to insert proper conversions to/from rotational speed. The Time class is now really turning into a full-on quotient. Might need refactoring.	2016-08-04 21:36:39 -04:00
Thomas Harte	e57ab1025d	Fixed location calculation, up to a point.	2016-08-03 22:33:00 -04:00
Thomas Harte	9af9b28baf	Made very first attempt at closing the loop on this. But it's time for work.	2016-08-03 08:16:23 -04:00
Thomas Harte	e15241dc3c	Added ability to query how long since the new interval was set to the timed event loop. Discovered that LCM will returning the net effect of the common factors only. Otherwise continued iterating towards time preservation.	2016-08-03 07:49:00 -04:00
Thomas Harte	a3a3486f54	Okay, it's becoming more apparent where the (very mild) complexity will be here. But started moving towards retaining rotation between tracks.	2016-08-03 07:33:26 -04:00
Thomas Harte	21f1fa37a4	Fixed Time addition, added accumulation of distance into track into the disk drive, added a short circuit for LCM.	2016-08-03 07:26:05 -04:00
Thomas Harte	30f8b6baa4	Made an attempt to add the necessary extension to Track, with a concrete implementation in PCMTrack, to support time-based seeking, the intended mechanism for not magically spinning the disk back to the index hole upon every head step.	2016-08-03 06:59:45 -04:00
Thomas Harte	d832e5e10d	Reduced 1540 PLL to running at 4Mhz. Which is possibly correct (?) Made minor change to avoid divide if possible.	2016-08-02 21:28:50 -04:00
Thomas Harte	bc10b3ee9a	It appears the problem is as simple as sectors being counted from zero.	2016-08-01 10:08:38 -04:00
Thomas Harte	f5e4ea3351	Some minor tidying, lots more of the caveman stuff as I try to determine what I'm doing wrong.	2016-08-01 09:43:08 -04:00
Thomas Harte	a00f9adba3	Made a first attempt at D64 support. Made an error somewhere but this should be 90% of it.	2016-08-01 08:41:16 -04:00
Thomas Harte	58297f1baf	Performed the basic metadata and routing for opening D64 files. Realised that I wasn't actually necessarily catching exceptions properly for all file opens, and fixed.	2016-08-01 07:09:15 -04:00
Thomas Harte	2799a87218	Reduced possibility of overflow on LCM, improved commenting widely, removed one stale piece of G64 bootstrapping caveman stuff.	2016-08-01 06:04:55 -04:00
Thomas Harte	198fbbedc7	Reeled back all appropriate pieces of caveman debugging.	2016-07-31 13:42:34 -04:00
Thomas Harte	2332f72875	Formalised clock-rate multiplication within disk drives, discovered that the stepper didn't have ideal behaviour for my timed event loop and hence nailed down the semantics a ilttle more. ... (obiter: the 1540 now appears to discern the correct sequence of bits. Framing is off in my test printfs but that's neither here nor there).	2016-07-31 13:32:30 -04:00
Thomas Harte	6ee784a893	Increased logging; discovered I was packing events together too closely. Now getting some zeros.	2016-07-30 04:30:55 -04:00
Thomas Harte	fead524eb5	Attempted to give the PLL a litte extra leeway, and fixed PCMTrack length test.	2016-07-29 18:52:50 -04:00
Thomas Harte	8f62211f5e	Wired up the 1540 as a PLL delegate. Which prima facie means it should start receiving a bit stream. Except that I clearly have something in the timing way off — either my flux transitions are far too short or I need to significantly increase the clock rate on the PLL.	2016-07-29 12:08:18 -04:00
Thomas Harte	89a1881fef	Started turning the 1540 into an actual disk drive.	2016-07-29 11:03:09 -04:00
Thomas Harte	6532b3a8c8	Filled in a calculation of clocks per bit that'll do.	2016-07-29 07:51:07 -04:00
Thomas Harte	f984de42a3	Took some small steps towards having a disk drive that at least can select a track and pump relevant events into a PLL.	2016-07-29 07:31:02 -04:00
Thomas Harte	e55db0cfe8	Made an attempt to eliminate creeping tape processing accuracy misses, which implied factoring out the GCM and LCD functions, which I then felt didn't really amount to signal processing.	2016-07-29 05:19:01 -04:00
Thomas Harte	5c1614ce7b	Attempted to simplify, very slightly.	2016-07-28 14:35:39 -04:00
Thomas Harte	015cea494d	Switched to a much-more straightforward PLL. I think I'm just fiddling now rather than moving forwards. Probably time to move on?	2016-07-28 11:32:14 -04:00
Thomas Harte	e061e849d4	Had a second bash at the PLL. Probably I should read some of the literature.	2016-07-27 16:24:24 -04:00
Thomas Harte	63f39608a6	Added just enough to get back to a working build.	2016-07-15 20:35:19 -04:00
Thomas Harte	165dbd9651	Started fleshing this out a bit. Hopefully.	2016-07-15 08:28:34 -04:00
Thomas Harte	0aa90b943b	Switched to specifying bit length as a quotient for the purposes of a PCMSegment and verified that I had the logic for picking a Commodore time zone backwards: bigger numbers are faster, not slower. ... Started sketching out a DiskDrive class.	2016-07-15 06:51:11 -04:00
Thomas Harte	6afd619791	Eliminated floating point arithmetic.	2016-07-14 19:47:00 -04:00
Thomas Harte	6b4fec37ff	Moved down to a single divide.	2016-07-14 19:45:08 -04:00
Thomas Harte	481475a0f4	Switched to a full-on linear regression. Which causes the current tests to pass.	2016-07-14 19:42:01 -04:00
Thomas Harte	6d6b26b99f	Actually made things worse.	2016-07-14 07:32:27 -04:00
Thomas Harte	d8d3464c56	Made a quick-hack attempt at PLL synchronisation. Which doesn't work.	2016-07-14 07:31:23 -04:00
Thomas Harte	d1fe07f14d	Added test of perfect DPLL input timing.	2016-07-12 21:42:23 -04:00
Thomas Harte	94db45456e	Started sketching out the basic form here, albeit that it doesn't yet do _the only thing it advertises itself as useful for_.	2016-07-12 20:23:56 -04:00
Thomas Harte	75d95c0bc0	Sketched out an interface for a digial PLL. Not persuaded yet. Baby steps.	2016-07-11 22:12:58 -04:00
Thomas Harte	1e9eedc314	Factored out the PCM track since it's going to be a useful construct for almost every file format. Documented it a little better.	2016-07-10 18:36:52 -04:00
Thomas Harte	66895d3ac7	Actually, I think this is the correct conversion from received speed to clock rate. It'll become obvious if it's not when I get back to working on the 1541 itself.	2016-07-10 18:24:12 -04:00
Thomas Harte	19ee430d4a	Made an effort to support zoned tracks, at least.	2016-07-10 18:07:53 -04:00
Thomas Harte	6593caca93	Switched to a probably more helpful way around of expecting bits in bytes.	2016-07-10 16:21:52 -04:00
Thomas Harte	845a00ccef	Attempted via linear search to implement PCMTrack::get_next_event.	2016-07-10 16:17:25 -04:00
Thomas Harte	f9510c1b67	Put sufficiently much of PCMTrack into place to get to a stored list of segments, having determined a common clock rate between them and therefore a complete track length.	2016-07-10 16:10:05 -04:00
Thomas Harte	4ae9f5ad5d	Added preliminaries of reading the speed zone information.	2016-07-10 13:42:45 -04:00
Thomas Harte	8ae78ba4e0	Fixed signature check and fseek parameter order.	2016-07-10 13:32:59 -04:00
Thomas Harte	ff49857f5c	Started sketching out support for the G64 file format.	2016-07-10 10:17:53 -04:00
Thomas Harte	9e3d6b762b	Sketched out the generic interface for a disk, documenting it and the tape interface while I'm here.	2016-07-10 08:54:39 -04:00