Thomas Harte
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388dd99762
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Advanced this just enough to suggest a loading command for most things.
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2017-08-11 10:47:12 -04:00 |
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Thomas Harte
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026101a268
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Killed logic_extents_per_physical, since I don't know how to handle it, and instituted tracks, to allow a decision about short versus long allocation units.
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2017-08-11 10:46:50 -04:00 |
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Thomas Harte
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734099a956
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Threw a sector cache into my MFM parser, in an attempt to cut down analysis costs. Also made it aware of multiple heads.
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2017-08-11 10:29:13 -04:00 |
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Thomas Harte
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6be5851484
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Cleaned up.
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2017-08-10 22:34:29 -04:00 |
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Thomas Harte
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994179f188
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Taking a whole bunch of guesses, this might be correct.
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2017-08-10 22:33:08 -04:00 |
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Thomas Harte
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6a65c7a52a
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Started working on a CPC-oriented analyser; for now I just want to be able to make a good guess at the appropriate file to load from a disk. As it turns out, the CPC simply adopts the CP/M format, so a generic parser is appropriate. This is its beginning.
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2017-08-10 17:10:21 -04:00 |
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Thomas Harte
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0d2d3ea17c
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Merge branch 'master' into DeferredVideo
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2017-08-10 16:01:02 -04:00 |
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Thomas Harte
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5d374ebb18
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Merge pull request #184 from TomHarte/DeferredVideo
Reduces CRTC counter sizes to match real hardware; introduces a CRT gamma transform
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2017-08-10 16:00:39 -04:00 |
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Thomas Harte
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62eadbb51a
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Adjusted gamma ratio to be the correct way around. The PAL midrange should be slightly darker now.
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2017-08-10 15:36:27 -04:00 |
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Thomas Harte
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ad8c8166bc
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Built in gamma conversion for all machines, assuming an output of 2.8 for PAL, 2.2 for NTSC.
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2017-08-10 15:17:08 -04:00 |
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Thomas Harte
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a5593bec79
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Threw in support for the light-pen trigger.
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2017-08-10 15:00:14 -04:00 |
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Thomas Harte
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a1e2646301
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Imposed counter size limits.
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2017-08-10 14:58:24 -04:00 |
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Thomas Harte
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cf810d8357
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Minor: ensure the CRT is set to output as a monitor.
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2017-08-10 14:42:47 -04:00 |
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Thomas Harte
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f258d6fbb2
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Merge pull request #183 from TomHarte/6845Address
Corrects 6845 address loading
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2017-08-10 12:51:40 -04:00 |
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Thomas Harte
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4961fda2a9
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Ensured counter-intuitive CRTC writes get through, taking the opportunity to correct my handling of port IO in general: selecting multiple devices for input results in a logical AND (i.e. open collector mode), and both the CRTC and gate array will receive data from 'input's if applicable.
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2017-08-10 12:39:19 -04:00 |
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Thomas Harte
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6a6e5ae79c
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Forced users of the 6845 to be explicit about which type. So far with no effect.
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2017-08-10 12:28:57 -04:00 |
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Thomas Harte
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02d792c003
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Simplified logic slightly, avoiding repetition.
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2017-08-10 11:48:37 -04:00 |
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Thomas Harte
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be8e7a4144
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Eliminated false register aliasing, restricted register sizes and locked out reading and writing where appropriate.
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2017-08-10 11:22:30 -04:00 |
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Thomas Harte
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b1dbd7833a
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Merge branch 'master' into 6845Address
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2017-08-10 11:15:08 -04:00 |
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Thomas Harte
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84ab05c5ef
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Merge branch 'BetterFDC'
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2017-08-10 11:14:53 -04:00 |
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Thomas Harte
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78138261c2
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Merge pull request #182 from TomHarte/BetterFDC
Continues building up the 8272
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2017-08-10 11:14:08 -04:00 |
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Thomas Harte
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a4c910f1de
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This appears to be a more accurate take on 6845 address advancement — it is necessary that character output has finished for the line address to be updated.
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2017-08-10 11:12:53 -04:00 |
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Thomas Harte
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2eed24e859
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Made an initial attempt at [a subset of] multi-sector reads.
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2017-08-10 11:11:26 -04:00 |
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Thomas Harte
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7d1023ea98
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Added a 'ready' getter to Drive, formally to let the drive take ownership of that test.
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2017-08-08 21:15:56 -04:00 |
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Thomas Harte
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b11d142cff
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Switched to descriptive names.
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2017-08-08 20:35:41 -04:00 |
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Thomas Harte
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021ff8674e
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Added something for sense drive status.
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2017-08-08 20:30:54 -04:00 |
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Thomas Harte
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1b86bc21ab
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Might as well get official on my ongoing efforts at CPC emulation.
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2017-08-08 17:58:54 -04:00 |
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Thomas Harte
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e3d1f4fe1e
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Subjectively, this might be more correct. It definitely prevents intermediate frequencies. More research required.
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2017-08-08 17:58:35 -04:00 |
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Thomas Harte
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a7452aebff
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Merge pull request #181 from TomHarte/6128
Introduces support for 128kb CPCs.
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2017-08-08 16:06:31 -04:00 |
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Thomas Harte
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484524d781
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Implements RAM paging. The 6128 is now emulated.
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2017-08-08 16:01:56 -04:00 |
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Thomas Harte
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dbf9927caf
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Merge branch '8255Modes'
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2017-08-08 07:44:56 -04:00 |
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Thomas Harte
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3bdedfd749
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Improved comments.
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2017-08-08 07:44:46 -04:00 |
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Thomas Harte
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005084af3d
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Merge pull request #180 from TomHarte/6845FrameLength
Corrects an off-by-one error in [character] line counting within the 6845
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2017-08-08 07:37:48 -04:00 |
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Thomas Harte
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46278ff297
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Experimental: is this meant to be a compare-before-increment?
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2017-08-07 23:02:29 -04:00 |
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Thomas Harte
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d73dcbb268
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Merge pull request #179 from TomHarte/AYDirection
Makes various AY input/output fixes, and a few 8255 fixes along the way
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2017-08-07 19:58:39 -04:00 |
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Thomas Harte
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390ecec3d9
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Added: now declines to pass on output if in input mode for ports A and B.
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2017-08-07 19:56:22 -04:00 |
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Thomas Harte
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41a30c147d
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Adjusted: invalid register selection simply deselects all registers.
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2017-08-07 19:51:36 -04:00 |
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Thomas Harte
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4709ae80cb
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Added port direction tests.
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2017-08-07 19:36:55 -04:00 |
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Thomas Harte
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7fbb455836
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Per the CPC test I'm checking, 0s should be returned for non-retained bits, not 1s.
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2017-08-07 19:07:12 -04:00 |
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Thomas Harte
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745afd217f
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The port input/output flags are now honoured; reading a port that is set as an output returns the current output value.
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2017-08-07 19:01:18 -04:00 |
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Thomas Harte
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4427e9a254
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Merge pull request #178 from TomHarte/CPC664
Introduces the beginning seeds 8272 emulation, and therefore floppy emulation for the CPC
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2017-08-07 18:39:33 -04:00 |
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Thomas Harte
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2b0dcf8573
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Transcribed the status bits that I think actually need to be obeyed.
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2017-08-07 12:37:45 -04:00 |
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Thomas Harte
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47732ffb98
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Prevented the 8272 from overreading ID fields (and, by doing so, overrunning its internal buffer). Exposed the MFMController's CRC generator for inspection.
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2017-08-07 12:37:22 -04:00 |
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Thomas Harte
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d07f3216ab
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Added a broad phase on whether seeking is ongoing.
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2017-08-07 12:12:59 -04:00 |
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Thomas Harte
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56d65ba6f3
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Adapted slightly, to retain the ability to advertise an incorrect size, to adjust the confusion I've created by having two different types of thing both called new_sector, and to print a warning when ignoring error flags.
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2017-08-07 12:12:04 -04:00 |
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Thomas Harte
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895a3cbf24
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Corrected reading of the track size table for extended disks. My first extended disk has now loaded.
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2017-08-07 11:38:19 -04:00 |
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Thomas Harte
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d951c8c1c2
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Fixed search for track start position with extended disks: it's no longer an infinite loop. So that's a pretty good performance improvement.
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2017-08-07 11:36:29 -04:00 |
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Thomas Harte
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a294963e98
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Made an absolutely basic attempt to accommodate some extended disk images.
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2017-08-07 11:26:15 -04:00 |
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Thomas Harte
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68c73184b1
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Had failed to spot that by taking control of stepping at this level, the appropriate invalidate_tracks were not being sent.
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2017-08-07 10:36:53 -04:00 |
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Thomas Harte
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7f824d6494
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Ensured seeks and recalibrates end immediately if no seeking is required.
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2017-08-07 10:31:32 -04:00 |
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