70 Commits

Author	SHA1	Message	Date
Thomas Harte	ca53fac732	Switched to assuming a single-sided disk, moved out magic constants.	2016-09-26 21:20:30 -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	523dbb9678	This'll do for getting the ADF into the machine.	2016-09-25 18:32:26 -04:00
Thomas Harte	de863719d0	Made a first attempt at Acorn ADFS support plus the start of a suitable analyser.	2016-09-25 17:46:11 -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	64f2538b1f	Added CRC checking to DFS comprehension; fixed a bunch of places where I'd used Objective-C's #import rather than #include.	2016-09-19 08:16:06 -04:00
Thomas Harte	8a1b805d11	Fixed file offset calculation for single-sided images.	2016-09-19 07:34:10 -04:00
Thomas Harte	b1e7f2dfd0	There's no cache and no CRC checking yet, but this is probably a rough outline of an FM parser.	2016-09-18 22:03:06 -04:00
Thomas Harte	d1c861d3a5	That should be that, I hope.	2016-09-18 21:09:32 -04:00
Thomas Harte	02c9a82cb5	Edging towards SSD/DSD support. Hold on!	2016-09-18 19:32:08 -04:00
Thomas Harte	91cd7e143b	Started on the SSD/DSD support. Realised I had ommitted multiple head support from my disk class. Fixed that.	2016-09-18 19:21:02 -04:00
Thomas Harte	5409c8ec54	Switched PCMSegments to std::vector; ensured generated [M]FM tracks are correctly sized, thereby making sure the individual flux windows will be correctly sized.	2016-09-18 18:56:35 -04:00
Thomas Harte	d9aaf456f0	Adapted pervasively to MSB-first output. Which seems to be correct.	2016-09-18 18:46:58 -04:00
Thomas Harte	180c3df2d4	Calling it 'number theory' probably isn't accurate but extracted the CRC stuff and started using it for [M]FM encoding.	2016-09-18 18:33:26 -04:00
Thomas Harte	55a7418cbf	Parameterised to perform FM and MFM encodings, at least subject to CRCs still being missing.	2016-09-18 17:16:20 -04:00
Thomas Harte	22eed60d2b	Started sketching out basic MFM track encoding. Which possibly even means that the shifters don't need to be public?	2016-09-18 16:53:21 -04:00
Thomas Harte	0089c830c6	This possibly correctly encapsultes the lowest level of FM and MFM rules.	2016-09-18 14:17:06 -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	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