Thomas Harte
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fead524eb5
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Attempted to give the PLL a litte extra leeway, and fixed PCMTrack length test.
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2016-07-29 18:52:50 -04:00 |
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Thomas Harte
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8f62211f5e
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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.
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2016-07-29 12:08:18 -04:00 |
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Thomas Harte
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89a1881fef
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Started turning the 1540 into an actual disk drive.
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2016-07-29 11:03:09 -04:00 |
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Thomas Harte
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6532b3a8c8
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Filled in a calculation of clocks per bit that'll do.
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2016-07-29 07:51:07 -04:00 |
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Thomas Harte
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f984de42a3
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Took some small steps towards having a disk drive that at least can select a track and pump relevant events into a PLL.
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2016-07-29 07:31:02 -04:00 |
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Thomas Harte
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0e581c7607
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Factored out the stuff of running a timed event loop from the TapePlayer.
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2016-07-29 07:15:46 -04:00 |
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Thomas Harte
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e55db0cfe8
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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.
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2016-07-29 05:19:01 -04:00 |
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Thomas Harte
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5c1614ce7b
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Attempted to simplify, very slightly.
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2016-07-28 14:35:39 -04:00 |
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Thomas Harte
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015cea494d
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Switched to a much-more straightforward PLL. I think I'm just fiddling now rather than moving forwards. Probably time to move on?
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2016-07-28 11:32:14 -04:00 |
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Thomas Harte
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e061e849d4
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Had a second bash at the PLL. Probably I should read some of the literature.
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2016-07-27 16:24:24 -04:00 |
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Thomas Harte
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63f39608a6
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Added just enough to get back to a working build.
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2016-07-15 20:35:19 -04:00 |
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Thomas Harte
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165dbd9651
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Started fleshing this out a bit. Hopefully.
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2016-07-15 08:28:34 -04:00 |
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Thomas Harte
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0aa90b943b
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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.
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2016-07-15 06:51:11 -04:00 |
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Thomas Harte
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74817f6664
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With a history of three pulses, this can track up a 10% sine variation in a 1010101 stream. So I guess this'll do for now?
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2016-07-14 19:54:48 -04:00 |
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Thomas Harte
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6afd619791
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Eliminated floating point arithmetic.
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2016-07-14 19:47:00 -04:00 |
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Thomas Harte
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6b4fec37ff
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Moved down to a single divide.
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2016-07-14 19:45:08 -04:00 |
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Thomas Harte
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481475a0f4
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Switched to a full-on linear regression. Which causes the current tests to pass.
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2016-07-14 19:42:01 -04:00 |
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Thomas Harte
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6d6b26b99f
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Actually made things worse.
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2016-07-14 07:32:27 -04:00 |
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Thomas Harte
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d8d3464c56
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Made a quick-hack attempt at PLL synchronisation. Which doesn't work.
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2016-07-14 07:31:23 -04:00 |
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Thomas Harte
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ac1bc588dd
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Improved factoring and increased window of testing, causing both the fast and slow tests to show framing errors.
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2016-07-14 07:12:02 -04:00 |
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Thomas Harte
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d1fe07f14d
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Added test of perfect DPLL input timing.
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2016-07-12 21:42:23 -04:00 |
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Thomas Harte
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94db45456e
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Started sketching out the basic form here, albeit that it doesn't yet do _the only thing it advertises itself as useful for_.
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2016-07-12 20:23:56 -04:00 |
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Thomas Harte
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75d95c0bc0
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Sketched out an interface for a digial PLL. Not persuaded yet. Baby steps.
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2016-07-11 22:12:58 -04:00 |
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Thomas Harte
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d0200b6fd9
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Merge pull request #40 from TomHarte/DiskFileFormats
Establishes the form of a modelled floppy disk plus parts of the most-likely implementation; implemented support for G64 as the first input format
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2016-07-10 18:37:44 -04:00 |
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Thomas Harte
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1e9eedc314
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Factored out the PCM track since it's going to be a useful construct for almost every file format. Documented it a little better.
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2016-07-10 18:36:52 -04:00 |
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Thomas Harte
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66895d3ac7
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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.
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2016-07-10 18:24:12 -04:00 |
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Thomas Harte
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19ee430d4a
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Made an effort to support zoned tracks, at least.
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2016-07-10 18:07:53 -04:00 |
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Thomas Harte
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ada2f073e0
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Completed handing of the disk all the way to the 1540.
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2016-07-10 16:24:46 -04:00 |
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Thomas Harte
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6593caca93
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Switched to a probably more helpful way around of expecting bits in bytes.
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2016-07-10 16:21:52 -04:00 |
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Thomas Harte
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845a00ccef
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Attempted via linear search to implement PCMTrack::get_next_event.
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2016-07-10 16:17:25 -04:00 |
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Thomas Harte
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f9510c1b67
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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.
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2016-07-10 16:10:05 -04:00 |
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Thomas Harte
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4ae9f5ad5d
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Added preliminaries of reading the speed zone information.
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2016-07-10 13:42:45 -04:00 |
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Thomas Harte
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8ae78ba4e0
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Fixed signature check and fseek parameter order.
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2016-07-10 13:32:59 -04:00 |
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Thomas Harte
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6cfc514c2d
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Made the rote changes necessary to attempt to open and to supply a G64 to the Vic.
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2016-07-10 12:57:17 -04:00 |
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Thomas Harte
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ff49857f5c
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Started sketching out support for the G64 file format.
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2016-07-10 10:17:53 -04:00 |
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Thomas Harte
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9e3d6b762b
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Sketched out the generic interface for a disk, documenting it and the tape interface while I'm here.
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2016-07-10 08:54:39 -04:00 |
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Thomas Harte
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cf83258eaf
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Merge pull request #39 from TomHarte/1540
Starts work on the serial bus and preparatory work for a 1540 emulation
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2016-07-10 08:06:04 -04:00 |
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Thomas Harte
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11cd541786
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Fixed accidental indentation.
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2016-07-10 08:05:05 -04:00 |
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Thomas Harte
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4ca6883f7c
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Disabled attachment of a 1540 again, as I probably need to move to opening an actual disk image next.
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2016-07-10 08:03:36 -04:00 |
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Thomas Harte
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824d9ea92b
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Added further comments.
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2016-07-10 08:01:16 -04:00 |
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Thomas Harte
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d8334edf4a
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Started trying to clean up, including commuting the C1540 source file name to match its class name but mainly by adding documentation.
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2016-07-10 07:46:20 -04:00 |
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Thomas Harte
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c0ab45a73d
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Disabled a bunch of the caveman debug logging.
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2016-07-09 22:29:11 -04:00 |
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Thomas Harte
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f589d639db
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Okay, so it seems that sync also works the other way around.
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2016-07-09 22:25:44 -04:00 |
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Thomas Harte
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693c8b2438
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After all that, it seems likely that inputs just aren't inverted for the Vic.
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2016-07-09 20:03:38 -04:00 |
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Thomas Harte
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656cd211d7
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Was transmitting bit levels backwards (probably?); 1540 now acknowledges byte received.
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2016-07-09 18:06:49 -04:00 |
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Thomas Harte
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01746f0512
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This is probably a valid test. But I'm not completely sure. Time to figure out what's happening on the 1540 end.
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2016-07-09 18:01:04 -04:00 |
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Thomas Harte
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cd84c35552
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Whoops, one bit too short.
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2016-07-09 17:51:46 -04:00 |
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Thomas Harte
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cd362b46b3
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This is a valid attempt to send a whole byte, I think.
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2016-07-09 17:51:04 -04:00 |
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Thomas Harte
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3560babd7e
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Got back to a failing test, now while trying to transmit a whole byte. Good stuff!
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2016-07-09 17:39:51 -04:00 |
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Thomas Harte
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66caa3c6dc
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Fixed setup of bridge class.
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2016-07-09 17:23:43 -04:00 |
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