Thomas Harte
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dab3580111
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Experimental: can I afford a lower sampling rate if there's a low-pass filter in effect?
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2016-08-22 22:18:05 -04:00 |
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Thomas Harte
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f937e08c91
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Merge pull request #47 from TomHarte/PALAudioFrequency
Corrects Vic audio output (i) in PAL mode; and (ii) generally as concerns all but the highest-frequency channel
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2016-08-21 20:45:09 -04:00 |
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Thomas Harte
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1541273785
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Moved responsibility for throwing in a low-pass filter up to the Vic, appropriately.
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2016-08-21 18:13:31 -04:00 |
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Thomas Harte
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c783090980
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It turns out that the Vic has a 1.6Khz low-pass filter. So added that.
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2016-08-21 12:13:41 -04:00 |
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Thomas Harte
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8d839c5278
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I think this is correct. And have explained why.
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2016-08-20 16:54:43 -04:00 |
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Thomas Harte
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7c9455251d
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Fixed reload for the lower-frequency audio channels.
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2016-08-19 17:34:01 -04:00 |
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Thomas Harte
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99157ad6b2
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Ensured the 6560 knows its real audio clock on a PAL machine; removed some stray semicolons.
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2016-08-19 13:35:34 -04:00 |
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Thomas Harte
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e985c72ce8
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Removed a dead special case.
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2016-08-19 12:23:06 -04:00 |
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Thomas Harte
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0cf3e25dd0
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Merge pull request #46 from TomHarte/PRGTape
Adjusts non-ROM PRG loading to be via the tape interface
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2016-08-19 12:20:11 -04:00 |
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Thomas Harte
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73ce67bee8
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Added some documentation of the intention here.
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2016-08-19 11:04:59 -04:00 |
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Thomas Harte
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4edd1214f1
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This has now successfully loaded its first PRG-as-a-tape.
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2016-08-19 10:58:42 -04:00 |
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Thomas Harte
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902c0f967a
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Implements known phase pattern for PAL output.
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2016-08-17 08:09:48 -04:00 |
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Thomas Harte
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2935848f35
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Adopted header/header/data/data pattern. But still not complete joy.
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2016-08-17 08:03:34 -04:00 |
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Thomas Harte
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e5523dbbed
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This gets through loading the first(/only?) copy. I tried repeating it with a bit-flipped header, now I'm trying repeating the header with a different file type. More documentation searching to do, I guess.
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2016-08-16 22:17:08 -04:00 |
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Thomas Harte
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1bca9aa2bb
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Fixed parity: now calculated from the actual byte and works the other way around. The Vic now believes it is loading the actual program. So I guess bytes, headers and the lead-in is working.
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2016-08-16 21:41:09 -04:00 |
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Thomas Harte
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dfe9fb83ef
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This proves that bytes are being deposited properly. For the first 36 anyway, and with no announcement.
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2016-08-16 21:09:50 -04:00 |
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Thomas Harte
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12f8aff65b
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Lengths I'd taken seem to have been for dipoles, not single poles. So I just doubled the clock rate. Also I was producing each dipole as high then low, when they should probably be low then high. The Vic now at least recognises that something is happening on the tape.
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2016-08-16 19:46:53 -04:00 |
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Thomas Harte
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3a23d5d8cf
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Adjusted the check digit.
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2016-08-15 22:44:36 -04:00 |
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Thomas Harte
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dbe47f3f45
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I've obviously misunderstood something as, as far as I'm concerned, this should at least get me a 'LOADING'.
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2016-08-15 22:40:05 -04:00 |
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Thomas Harte
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7994148f55
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I'm starting to make a little headway, I think: this performs lead-ins and countdowns, though with no actual data or anything as helpful as that.
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2016-08-15 22:10:53 -04:00 |
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Thomas Harte
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7e2b4554ea
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This likely forms the Commodore dipoles correctly. It just stays stuck in leader tone forever is all.
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2016-08-15 20:08:50 -04:00 |
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Thomas Harte
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ca2dc6b6c4
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Ensured ROMs survive in the new memory model.
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2016-08-15 19:56:01 -04:00 |
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Thomas Harte
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38aec44d85
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Made sufficient changes for the Vic itself to believe it can recast a PRG as a tape and insert it that way. So now the ball is in the court of: how the heck are Commodore tapes encoded?
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2016-08-15 19:44:41 -04:00 |
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Thomas Harte
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3aa40212f3
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Fixed minor documentation error; admitted that this class didn't invent the idea of a pulse.
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2016-08-15 19:37:21 -04:00 |
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Thomas Harte
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e59301b416
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Merge pull request #45 from TomHarte/MemoryModels
Vic: Adds support for expanded memory and PAL region machines.
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2016-08-14 20:01:19 -04:00 |
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Thomas Harte
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547aefb696
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Slightly adjusted PRG strategy, made a note about where next.
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2016-08-14 16:36:42 -04:00 |
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Thomas Harte
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6079d30e58
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Eliminated waiting here — either the buffer can be enqueued now or it is dropped.
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2016-08-14 16:20:24 -04:00 |
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Thomas Harte
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48a00d9e05
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... which means that all files are now expected.
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2016-08-14 14:24:03 -04:00 |
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Thomas Harte
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5373f6cc57
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Completed setting of options, including mapping from country to ROM + television standard.
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2016-08-14 14:23:08 -04:00 |
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Thomas Harte
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b5af1746d5
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Added a through path to the Objective-C for setting region and memory size.
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2016-08-14 14:14:59 -04:00 |
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Thomas Harte
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f15d89239f
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Made a stab at storage and restoration of country and memory size.
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2016-08-14 14:00:08 -04:00 |
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Thomas Harte
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df77c2a20a
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Added the XIB side of wiring for region and memory size options.
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2016-08-14 13:53:14 -04:00 |
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Thomas Harte
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d9016909ed
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Added some wiring for PAL/NTSC mode switching on the Vic, making an attempt to simplify the whole loop of having different clock rates.
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2016-08-14 13:33:20 -04:00 |
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Thomas Harte
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a547b7e1d8
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Took basic steps towards supporting memory expansions.
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2016-08-13 17:21:25 -04:00 |
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Thomas Harte
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0a13dd5c5b
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Merge pull request #44 from TomHarte/6560Template
Shifted the 6560 into an idiomatic template form; switched automatic loading to optional.
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2016-08-12 20:58:34 -04:00 |
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Thomas Harte
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142774be37
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Collapsed 6560 template to a more direct loop, albeit with quite a bit still left to fix.
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2016-08-09 21:10:53 -04:00 |
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Thomas Harte
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12bad8f23f
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Turned the 6560 into an ordinary template, similar to the rest of the project, albeit right now with a fairly shonky internal implementation. Fixed a Mac-specific interface sizing issue.
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2016-08-09 20:41:05 -04:00 |
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Thomas Harte
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285a288c80
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Switched to two cycles of options loading, meaning that they get set before files are inserted. Might need some further work?
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2016-08-07 21:48:09 -04:00 |
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Thomas Harte
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be54d8040e
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Made a first stab at having automatic loading be optional. But things are currently arranged such that the machine options are communicated too late to have an effect. So work to do.
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2016-08-06 17:39:27 -04:00 |
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Thomas Harte
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3e65450a54
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Converted the 6560 fully into a template; worked on allowing the typer to run at a much faster rate where hardware has some trigger by which it can request the next key.
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2016-08-06 14:33:24 -04:00 |
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Thomas Harte
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c6e046253e
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Shunted code for the main part up into the header, in advance of turning it into a template so as to bring it inside the normal orthodoxy.
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2016-08-05 19:13:49 -04:00 |
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Thomas Harte
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9d76cd9b60
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Removed dead instance storage.
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2016-08-04 21:41:12 -04:00 |
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Thomas Harte
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b46355331c
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Merge pull request #43 from TomHarte/NonSkippingTracks
Sought to prevent a reset of angular position when changing tracks
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2016-08-04 21:39:18 -04:00 |
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Thomas Harte
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3e90b85ff8
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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.
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2016-08-04 21:36:39 -04:00 |
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Thomas Harte
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e57ab1025d
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Fixed location calculation, up to a point.
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2016-08-03 22:33:00 -04:00 |
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Thomas Harte
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9af9b28baf
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Made very first attempt at closing the loop on this. But it's time for work.
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2016-08-03 08:16:23 -04:00 |
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Thomas Harte
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e15241dc3c
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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.
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2016-08-03 07:49:00 -04:00 |
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Thomas Harte
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a3a3486f54
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Okay, it's becoming more apparent where the (very mild) complexity will be here. But started moving towards retaining rotation between tracks.
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2016-08-03 07:33:26 -04:00 |
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Thomas Harte
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21f1fa37a4
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Fixed Time addition, added accumulation of distance into track into the disk drive, added a short circuit for LCM.
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2016-08-03 07:26:05 -04:00 |
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Thomas Harte
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30f8b6baa4
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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.
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2016-08-03 06:59:45 -04:00 |
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