Thomas Harte
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a9e65e9b7a
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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.
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2016-09-19 22:06:56 -04:00 |
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Thomas Harte
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64f2538b1f
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Added CRC checking to DFS comprehension; fixed a bunch of places where I'd used Objective-C's #import rather than #include.
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2016-09-19 08:16:06 -04:00 |
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Thomas Harte
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8a1b805d11
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Fixed file offset calculation for single-sided images.
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2016-09-19 07:34:10 -04:00 |
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Thomas Harte
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b1e7f2dfd0
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There's no cache and no CRC checking yet, but this is probably a rough outline of an FM parser.
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2016-09-18 22:03:06 -04:00 |
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Thomas Harte
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d1c861d3a5
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That should be that, I hope.
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2016-09-18 21:09:32 -04:00 |
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Thomas Harte
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02c9a82cb5
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Edging towards SSD/DSD support. Hold on!
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2016-09-18 19:32:08 -04:00 |
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Thomas Harte
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91cd7e143b
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Started on the SSD/DSD support. Realised I had ommitted multiple head support from my disk class. Fixed that.
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2016-09-18 19:21:02 -04:00 |
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Thomas Harte
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5409c8ec54
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Switched PCMSegments to std::vector; ensured generated [M]FM tracks are correctly sized, thereby making sure the individual flux windows will be correctly sized.
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2016-09-18 18:56:35 -04:00 |
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Thomas Harte
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d9aaf456f0
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Adapted pervasively to MSB-first output. Which seems to be correct.
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2016-09-18 18:46:58 -04:00 |
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Thomas Harte
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180c3df2d4
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Calling it 'number theory' probably isn't accurate but extracted the CRC stuff and started using it for [M]FM encoding.
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2016-09-18 18:33:26 -04:00 |
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Thomas Harte
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55a7418cbf
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Parameterised to perform FM and MFM encodings, at least subject to CRCs still being missing.
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2016-09-18 17:16:20 -04:00 |
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Thomas Harte
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22eed60d2b
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Started sketching out basic MFM track encoding. Which possibly even means that the shifters don't need to be public?
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2016-09-18 16:53:21 -04:00 |
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Thomas Harte
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0089c830c6
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This possibly correctly encapsultes the lowest level of FM and MFM rules.
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2016-09-18 14:17:06 -04:00 |
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Thomas Harte
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bcf91de7e9
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Declared support for the Acorn disk files, started hammering out an encoder.
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2016-09-18 13:35:54 -04:00 |
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Thomas Harte
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6454508db8
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Added a quick bit of documentation.
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2016-09-18 10:30:52 -04:00 |
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Thomas Harte
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65b568003d
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Clarified TODO.
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2016-09-18 10:29:45 -04:00 |
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Thomas Harte
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8c2bf099ad
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Cut down to one GCD and clarified variable names, getting more explicit about what's going on.
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2016-09-18 10:24:09 -04:00 |
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Thomas Harte
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79ef38b123
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Attempted to use the new get_cycles_until_next_event method to take some repetition outside of the PLL and drive event loops.
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2016-09-17 22:02:38 -04:00 |
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Thomas Harte
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dbb758aaf1
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Workaround for a weird bug that suddenly appears to manifest: gzgetc is returning the file name, not bytes from the file. Seems to be related to improper initialisation of the next field within the gzFile header. I can't immediately see where ZLib intends to do that so it's a bit mysterious. But the larger-than-8 readers could probably save time by reading in blocks anyway.
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2016-09-17 22:01:25 -04:00 |
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Thomas Harte
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14a9edcf5d
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Made an attempt to do the time base conversion upfront, saving a lot of hassle and allowing greater prediction.
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2016-09-17 19:52:27 -04:00 |
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Thomas Harte
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9d6dcb80a7
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Started work on a GCR parser and the helper functions that lie behind that.
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2016-09-13 21:53:36 -04:00 |
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Thomas Harte
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e3571e8b9e
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Added insurance against an infinite loop should the tape be exhausted.
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2016-09-12 22:22:23 -04:00 |
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Thomas Harte
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eeec516fa6
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Implemented seeking on tapes, mucked about a bit more with the Commodore analyser, at least temporarily removed cropping from the Vic emulator.
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2016-09-11 17:09:00 -04:00 |
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Thomas Harte
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1de6097f06
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Shuffled C stuff out on top.
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2016-09-08 21:08:03 -04:00 |
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Thomas Harte
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24251a2768
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Negligible indentation fix.
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2016-09-08 07:49:43 -04:00 |
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Thomas Harte
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01e5dae512
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Threw in 300-baud support. Why not?
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2016-09-08 07:48:20 -04:00 |
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Thomas Harte
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3e925e80a3
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Added a field-filling constructor for pulses.
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2016-09-08 07:41:44 -04:00 |
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Thomas Harte
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1e7b5330f5
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More or less rewrote, to use a filled-per-chunk buffer of upcoming pulses rather than working them out as requests come. Which is more straightforward — all the code for a particular chunk goes in exactly one place — and much easier to extend. So threw in a provisional 0104 implementation.
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2016-09-08 07:41:26 -04:00 |
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Thomas Harte
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d7d5f24aab
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Attempted, at least, to insert a dummy byte as per the specification.
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2016-09-06 21:51:04 -04:00 |
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Thomas Harte
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11850b872d
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Sought to emulate 0111 as a longer 0110 to test a particular HQ UEF. Some progress. Not great.
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2016-09-05 18:28:43 -04:00 |
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Thomas Harte
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21e5f407d8
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I need to get a bit more definitive on naming but this gets all the way to setting a configuration upon an Electron.
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2016-08-31 22:03:42 -04:00 |
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Thomas Harte
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963a479908
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Made a quick first attempt at getting a file name from Acorn tape, failing terribly but at least formalising tapes being able to signal their end.
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2016-08-29 21:53:06 -04:00 |
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Thomas Harte
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d1abfc040c
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Addressed my dithering here: the file format containers themselves should do nothing but inspect the data to find out whether it is of the correct format. The machine steps are there for machine-specific validation. So it's probably easier to treat a binary ROM image just as a binary ROM image. Therefore, the Acorn-specific .rom detection is now in an Acorn-specific area.
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2016-08-29 08:48:49 -04:00 |
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Thomas Harte
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29c972f4b8
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Added hacky segue into analysis for all Electron formats. Added analyser to try to differentiate Acorn-format ROMs from other things called .rom, which are likely to be numerous.
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2016-08-28 12:43:17 -04:00 |
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Thomas Harte
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d9f0065154
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Sketched out just enough classes to get through the get-contents-into-memory step of static analysis.
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2016-08-28 12:20:40 -04:00 |
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Thomas Harte
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24938326ac
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ROMs definitely have no behaviour other than responding to memory accesses. Cartridges might. So picked the more general term. Sketched out a class at least to parse PRG as though it were a cartridge. Hence the static analyser can guess at whether a PRG is a cartridge or an ordinary program.
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2016-08-27 18:26:51 -04:00 |
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Thomas Harte
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a1b3a18d11
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Started forcing a resolution on ROMs by doing. But have immediately misstepped. Rename coming momentarily...
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2016-08-27 18:17:40 -04:00 |
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Thomas Harte
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82c8459055
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Minor tidying of namespace usage declarations.
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2016-08-27 17:18:12 -04:00 |
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Thomas Harte
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56c0d70c1f
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Gave disks their own namespace.
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2016-08-27 17:15:09 -04:00 |
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Thomas Harte
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c0402d0c2b
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Gave tapes their own namespace.
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2016-08-27 17:09:45 -04:00 |
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Thomas Harte
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8c333059a8
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Turning this into a slog: gave UEF a more appropriate name, got as far as now having to decide what to do about ROMs as to structure. I guess they're machine specific, so specific classes?
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2016-08-27 16:40:21 -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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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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