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Commit Graph

1061 Commits

Author SHA1 Message Date
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
ee2a7c9415 Added slightly to exposition, to match other formats. 2016-08-01 06:54:57 -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
0e581c7607 Factored out the stuff of running a timed event loop from the TapePlayer. 2016-07-29 07:15:46 -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
Thomas Harte
c306d705e1 Made a quick first attempt at all-the-way-through tape wiring for the Vic. 2016-06-26 19:43:09 -04:00
Thomas Harte
37ba42a52f Factored out the stuff of playing a tape, started basic sketch of the Vic-related classes. 2016-06-26 19:03:57 -04:00
Thomas Harte
ee19417ded Made an attempt quickly to implement parsing of the Commodore .TAP file format. 2016-06-25 16:09:32 -04:00
Thomas Harte
21ca1ef86b Started attempting to clarify instance variable usage. 2016-03-12 23:19:10 -05:00
Thomas Harte
2b8fb5b615 Made an attempt to fix my 0114 implementation. 2016-02-20 23:13:58 -05:00
Thomas Harte
f7fc7cb932 Implemented some portion of 0114; ensured I'm safely skipping chunks in all cases. 2016-02-20 22:18:00 -05:00
Thomas Harte
ec3cccbb0d Working towards HQ UEF support: fixed bug whereby writing to tape output would reset input pulse stepper; added support for chunk 0116 and approximate support for 0113. 2016-02-20 22:03:14 -05:00
Thomas Harte
2e3ba6bbb2 Removed some logging. 2016-02-07 14:42:40 -05:00
Thomas Harte
adc6838ba0 Continued slow migration of shader ownership to CRT. Attempted to start debugging the tape interface. 2016-01-27 21:35:57 -05:00
Thomas Harte
e65cd4cf06 Some data is marginally reaching the CPU from the tape. 2016-01-19 22:05:34 -05:00
Thomas Harte
832797182f Update TapeUEF.cpp
Corrected chunk for which _tone_length is used, definition of a carrier tone chunk.
2016-01-19 18:59:10 -05:00
Thomas Harte
127684c590 With silence and high tone implemented, this may well hit a large proportion of existing files. 2016-01-18 19:45:14 -06:00
Thomas Harte
7d6214e078 This likely gets chunks 0100 and 0102 correct. 2016-01-18 19:37:36 -06:00
Thomas Harte
5a39e42413 Wired up enough such that some basic attempt at parsing a UEF occurs.` 2016-01-18 17:06:09 -06:00
Thomas Harte
2779f0e569 Statred working on support for at least the most fundamental file format. 2016-01-18 15:46:41 -06:00