Thomas Harte
c86db12f1c
Starts implementing DMA support on the 5380.
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The Macintosh doesn't actually use the DMA signals, but uses pseudo-DMA mode so they nevertheless need to be appropriate.
2019-08-24 22:47:11 -04:00
Thomas Harte
2d82855f26
Attempts to provide a data out phase.
2019-08-22 23:16:58 -04:00
Thomas Harte
faec516a2c
Starts pushing towards figuring out a proper infrastructure for mass storage.
2019-08-21 23:22:58 -04:00
Thomas Harte
bb1a0a0b76
Sketches out further SCSI infrastructure.
2019-08-21 22:37:39 -04:00
Thomas Harte
252650808d
Starts seeking to unbind SCSI bus logic and command performance.
2019-08-19 22:47:01 -04:00
Thomas Harte
e3d9254555
Implements phase-match bit.
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Seemingly causing the command phase to proceed.
2019-08-18 23:15:54 -04:00
Thomas Harte
955e909e61
Attempts to nudge the command phase further towards functioning.
2019-08-18 22:39:27 -04:00
Thomas Harte
8339e2044c
Switches to proper SCSI terminology and better attempts a command phase.
2019-08-18 15:10:07 -04:00
Thomas Harte
0e0c789b02
Starts attempting to introduce a direct access device.
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Without having access to the SCSI-1 standard, a lot of this is guesswork.
2019-08-17 23:43:42 -04:00
Thomas Harte
7e001c1d03
Corrects data line loading.
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Also adds some extra temporary logging. Outstanding question: why is ATN not being signalled? Is SEL enough?
2019-08-17 21:30:59 -04:00
Thomas Harte
9047932b81
Corrected basic error. Arbitration now seems to succeed.
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This is seemingly followed by a pattern of signalling BUSY+SEL followed by just SEL with the various other potential device IDs in turn. To which nothing ever responds as currently implemented.
2019-08-15 23:28:30 -04:00
Thomas Harte
f668e4a54c
Makes an attempt at getting the 5380 past arbitration.
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Not entirely successful. Also gets a bit smarter with `final` on ClockingHint::Sources.
2019-08-15 23:14:40 -04:00
Thomas Harte
ce1c96d68c
Starts thinking out the mechanics of emulating a SCSI-1 bus.
2019-08-13 23:09:11 -04:00
Thomas Harte
0f67e490e8
Adjusts NCR address decoding to produce a more plausible initial interaction.
2019-08-11 22:43:25 -04:00
Thomas Harte
a90a74a512
Stubs in just enough of the 5380 to get a Mac Plus too boot.
2019-08-11 20:55:20 -04:00
Thomas Harte
949c1e1668
Adds an empty shell for what will be my 5380 implementation.
2019-08-10 23:53:52 -04:00
Thomas Harte
96005261c7
Adds activity lights for Macintosh disk activity.
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Prompting a quick fix to drives not spinning down.
2019-08-02 16:26:23 -04:00
Thomas Harte
335dda3d55
Attempts more accurately to match Apple's windowing logic.
2019-08-02 12:49:45 -04:00
Thomas Harte
9bbccd89d3
Adds an extended rationale for current implementation.
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Also strips some cruft of prior guesses.
2019-07-31 23:19:46 -04:00
Thomas Harte
2aa308efdd
Tweaks magic formulas.
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The computer now at least seeks outward, until this attempt at drive speed calculation fails.
2019-07-30 16:18:36 -04:00
Thomas Harte
74c18d7861
Attempts a full wiring up of 400kb drive speed.
2019-07-30 15:08:55 -04:00
Thomas Harte
a43ada82b2
Experiments with a JustInTimeActor in the Master System.
2019-07-29 15:38:41 -04:00
Thomas Harte
85cf8d89bc
Ensures an initial non-zero value.
2019-07-25 21:47:44 -04:00
Thomas Harte
0469f0240b
Moves interrupt level selection outside the loop.
2019-07-23 23:13:03 -04:00
Thomas Harte
d69aee4972
Removes stray \n.
2019-07-23 22:17:46 -04:00
Thomas Harte
ee8d853fcb
Ensures you can't get a phase 2 for free with run_for(0).
2019-07-17 14:20:27 -04:00
Thomas Harte
67055d8b56
Reduces CheckingWriteProtect costs, negligibly.
2019-07-15 22:39:55 -04:00
Thomas Harte
7baad61746
Attempts a full implementation of asynchronous write mode.
2019-07-15 17:11:12 -04:00
Thomas Harte
1d1e0d74f8
Corrects and introduces new parts.
2019-07-12 21:37:33 -04:00
Thomas Harte
d53d1c616f
Continues trying to get to write support.
2019-07-12 21:20:05 -04:00
Thomas Harte
2c39229b13
Adds has-new-disk flag, allowing mounting of software from the desktop.
2019-07-12 13:17:24 -04:00
Thomas Harte
b730ac5d5a
Reintroduces 1-second disable implementation.
2019-07-11 23:02:47 -04:00
Thomas Harte
c8917e677b
Edging towards implementing IWM write support, but mainly tidied up.
2019-07-11 21:42:34 -04:00
Thomas Harte
cac97a9663
Devolves drive responsibility.
2019-07-10 22:39:56 -04:00
Thomas Harte
be251d6b03
Begins substituting the DoubleDensityDrive for the Sony.
2019-07-10 16:24:48 -04:00
Thomas Harte
6cfaf920ee
Added attribution and commentary on rotation speeds.
2019-07-10 16:22:06 -04:00
Thomas Harte
1657f8768c
Transfers and slightly extends drive logic into the drive.
2019-07-10 16:17:51 -04:00
Thomas Harte
c4ab0bb867
Starts sketching out an interface for IWM drives, eliminating a dangling use of unsigned as it goes.
2019-07-10 16:05:59 -04:00
Thomas Harte
fb6da1de4a
Reduces logging temporarily.
2019-07-08 17:37:15 -04:00
Thomas Harte
245e27c893
Solidifies belief that the shift register bit is cleared on read/write.
2019-07-08 16:45:15 -04:00
Thomas Harte
28de629c08
Fixes the 6522 sufficiently to fix keyboard input.
2019-07-08 15:29:34 -04:00
Thomas Harte
210bcaa56d
Introduces an initial shift unit test, and makes it pass.
2019-07-07 22:13:36 -04:00
Thomas Harte
191a7a9386
Reintroduces an empty second drive.
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This prevents the uninitialised disk error. Which is a clue.
2019-07-02 16:59:00 -04:00
Thomas Harte
b9c2c42bc0
Switches drives to using floats for time counting.
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Hopefully to eliminate a lot of unnecessary `Time` work; inaccuracies should still be within tolerable range.
2019-07-02 15:43:03 -04:00
Thomas Harte
6c588a1510
Makes some further random swings at tracking the startup procedure.
2019-06-28 13:03:47 -04:00
Thomas Harte
00c32e4b59
Further miscellaneous changes to debug logging. All temporary.
2019-06-18 10:34:31 -04:00
Thomas Harte
877b46d2c1
Advances IWM/drive emulation very close to the point of 'Welcome to Macintosh'.
2019-06-15 16:08:54 -04:00
Thomas Harte
cc7226ae9f
Starts trying to get a bit more rigorous about collected meanings.
2019-06-13 22:48:10 -04:00
Thomas Harte
bde975a3b9
Possibly mights the tiniest bit of headway with 'the IWM'.
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I'm now pretty sure that my 3.5" drive, which for now is implemented in the IWM (yuck) is just responding to queries incorrectly.
2019-06-13 22:38:09 -04:00
Thomas Harte
f6f9024631
Corrects Macintosh aspect ratio (and framing).
2019-06-13 18:41:38 -04:00
