Thomas Harte
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de863719d0
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Made a first attempt at Acorn ADFS support plus the start of a suitable analyser.
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2016-09-25 17:46:11 -04:00 |
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Thomas Harte
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6084020ab3
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Added shift-break as a better way to boot suitable disks. Continued attempting to clean the 1770.
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2016-09-25 14:11:22 -04:00 |
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Thomas Harte
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a538b45213
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Sought to implement the verify step of type 1 commands.
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2016-09-25 09:54:49 -04:00 |
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Thomas Harte
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67b54269c9
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Added typer support for loading from DFS. It'll do for now.
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2016-09-24 22:52:49 -04:00 |
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Thomas Harte
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0918751802
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Fixed stepping out.
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2016-09-24 22:48:45 -04:00 |
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Thomas Harte
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9e1d4c8b01
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Fixed an initial setup error with seek.
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2016-09-24 22:43:12 -04:00 |
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Thomas Harte
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d50629e6aa
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This is clearly the winning solution. Edited down.
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2016-09-24 22:36:38 -04:00 |
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Thomas Harte
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07ff5138b7
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The catalogue now loads.
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2016-09-24 22:35:34 -04:00 |
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Thomas Harte
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1b69ad0fd4
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This attempts to implment sector reading. DFS reports an error.
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2016-09-24 22:29:02 -04:00 |
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Thomas Harte
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ce4100e5b9
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Fixed slots for DFS and ADFS to sideways RAM; continued working on the 1770 to get as far as trying to get the body of a sector.
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2016-09-24 22:04:54 -04:00 |
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Thomas Harte
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7154e8986e
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Fixed stepping delay.
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2016-09-24 20:16:23 -04:00 |
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Thomas Harte
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53522e28e2
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Performed an about-face on how this should probably be implemented. Now forsaking the state machine in favour of a macro'd switch-for-cooperative-event-based-messaging implementation. Let's see how this ends up looking.
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2016-09-24 20:12:45 -04:00 |
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Thomas Harte
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88bbeedad3
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Set actual bit length.
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2016-09-22 21:28:23 -04:00 |
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Thomas Harte
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75eb62b577
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One painful step at a time, this now starts the disk rotating and gets as far as deciding whether it's about to head off on a read or a write.
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2016-09-22 21:25:31 -04:00 |
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Thomas Harte
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8db0030068
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Fixed ROM loading by the Electron, turned the WD1770 into a 'disk drive' (it'll do for now), persuaded it to get all the way through a very specifically convenient type 1 command.
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2016-09-20 22:14:33 -04:00 |
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Thomas Harte
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7a34ae0da6
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This is the start of my slog through type 1 commands. I kind of need to figure out what I'm doing about drives and PLLs now though.
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2016-09-20 16:58:23 -04:00 |
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Thomas Harte
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3b97b038b9
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Corrected and sketched out state machine far enough to get to a complaint about unhandled work.
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2016-09-20 15:56:31 -04:00 |
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Thomas Harte
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e358057440
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Added a WD1770 run_for_cycles call. So I really can now move that as far as reporting that it has no disk?
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2016-09-20 07:42:17 -04:00 |
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Thomas Harte
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cd5939501f
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Treading water some more, ensured the DFS and ADFS ROMs get to the Electron. It now even inserts the DFS ROM if it has a DFS disk image. Might need to make it a sideways RAM though? Regardless, the next job surely — surely! — has to be to stop avoiding the 1770?
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2016-09-20 07:36:57 -04:00 |
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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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c9dd07cecd
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DFS disks are now delivered right up to the emulator's front door. So everything's in place to get started on that WD1770 nonsense.
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2016-09-19 08:29:23 -04:00 |
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Thomas Harte
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e025768604
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Two passes of the index hole => no sector found.
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2016-09-19 08:17:07 -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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c58cdbf151
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Minor tweak to support zero-length files.
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2016-09-19 07:37:11 -04:00 |
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Thomas Harte
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ca4df5dd61
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Introduced a full container for disk catalogues, so as also to capture non-file information, and 'completed' (i.e. albeit that CRC checking is still absent) DFS catalogue decoding.
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2016-09-19 07:35:02 -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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231f3dd0f4
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This is exactly as far as I'm going to get with DFS parsing today, I think.
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2016-09-18 22:18:01 -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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fbcb59d47a
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A policy change trial: let the person above deal with any error.
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2016-09-18 21:18:41 -04:00 |
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Thomas Harte
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0ce901bd48
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Added necessary wiring to get as far as asking an arm of the analyser to check out an Acorn disk image.
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2016-09-18 21:18:11 -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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5ebca62bba
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Now the CRC is a factoring out.
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2016-09-18 18:35:50 -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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0e44cfa8a1
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Merge branch 'master' into WD1770
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2016-09-18 10:34:11 -04:00 |
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Thomas Harte
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656d0c7a69
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Merge pull request #50 from TomHarte/FasterDisk
Introduces a slightly less expensive timed event loop
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2016-09-18 10:33:16 -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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6f0b9adc3d
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Factors.cpp is dead.
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2016-09-18 10:23:34 -04:00 |
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Thomas Harte
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48317f3b77
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Templated these two methods, so as no longer to put a constraint on precision.
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2016-09-18 10:23:15 -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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bfed9585b8
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Added a sector cache to avoid having to re-decode things five times over.
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2016-09-17 22:01:54 -04:00 |
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