Thomas Harte
f2e1584275
Starts working on the GPIP functionality block.
2019-10-16 23:21:25 -04:00
Thomas Harte
0fd8813ddb
Attempts to tie an intelligent keyboard to the other end of its serial line.
2019-10-16 23:21:14 -04:00
Thomas Harte
b69180ba01
Corrects documentation error.
2019-10-16 23:19:42 -04:00
Thomas Harte
c352d8ae8c
Adds a received_data_ register, that presently can never fill.
2019-10-13 23:04:57 -04:00
Thomas Harte
530e831064
Corrects transmission logic — exactly hitting write_data_time_remaining now works properly.
2019-10-13 21:40:46 -04:00
Thomas Harte
3b165a78f2
Ensures remaining_delays_ is set properly after [reset/flush]_writing.
2019-10-13 21:39:25 -04:00
Thomas Harte
8d87e9eb1c
The ACIA actually has two clocks, though on an ST they're both 500,000 Hz.
2019-10-13 21:32:34 -04:00
Thomas Harte
f86dc082bb
Ensures serial lines know their writer's clock rate.
2019-10-13 20:41:08 -04:00
Thomas Harte
d7982aa84e
JustInTimeActors can now specify a clock divider.
2019-10-13 18:19:39 -04:00
Thomas Harte
516d78f5a8
Attempts to implement transmission interrupts and ClockingHint::Source.
2019-10-12 23:46:57 -04:00
Thomas Harte
8b50a7d6e3
Attempts mostly to implement 6850 output.
2019-10-12 23:14:29 -04:00
Thomas Harte
4bf81d3b90
Decodes the 6850 control register, and starts working on standardised serial ports.
2019-10-12 18:19:55 -04:00
Thomas Harte
cd75978e4e
Nudges 6850 towards coherence.
2019-10-12 00:04:02 -04:00
Thomas Harte
c5ebf75351
Attempts to start producing actual video.
2019-10-10 22:46:58 -04:00
Thomas Harte
d7ce2c26e8
Adds an empty shell for the ACIA.
2019-10-10 20:54:29 -04:00
Thomas Harte
f88e1b1373
Adds enough logic to advance to an ACIA access error.
2019-10-09 23:01:11 -04:00
Thomas Harte
1de1818ebb
Makes an unsuccessful first attempt at some timer functionality.
2019-10-07 22:44:35 -04:00
Thomas Harte
885f890df1
Adds a target for MFP read/write operations.
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Completely without any implementation, so far.
2019-10-06 23:14:05 -04:00
Thomas Harte
929475d31e
Minor correction: round down, not up.
2019-09-28 23:49:32 -04:00
Thomas Harte
7758f9d0a9
Improves nomenclature.
2019-09-24 22:31:36 -04:00
Thomas Harte
8d4a96683a
Reduces output noise.
2019-09-18 21:41:29 -04:00
Thomas Harte
f53411a319
Removes local NDEBUG.
2019-09-18 21:35:26 -04:00
Thomas Harte
962275c22a
Removes clock for NCR 5380.
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It doesn't have one in real life, and now can live off the time counting that occurs on the SCSI bus.
2019-09-18 20:17:47 -04:00
Thomas Harte
2f6c366668
Makes a concerted effort at properly wrapping a hard disk image.
2019-09-17 21:30:04 -04:00
Thomas Harte
2ce1f0a3b1
Implements multi-sector read/write.
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This once again unblocks Apple HD SC Setup. Progress!
2019-09-16 22:20:42 -04:00
Thomas Harte
960b289e70
Edges closer towards proper DMA operation.
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Specifically: differentiates the three kinds of DMA operation. Still doesn't act correctly with regard to DACK though, and leaves the bus instantaneously improperly formed. Which I'm tempted to try to fix on the target side by properly obeying delays.
2019-09-15 15:03:06 -04:00
Thomas Harte
243e40cd79
Adds signalling of DACK.
2019-09-14 13:48:33 -04:00
Thomas Harte
64dad35026
Decreases logging, at least temporarily.
2019-09-03 22:40:32 -04:00
Thomas Harte
1c7e0f3c9d
Fixes control line modification by the 5380 and SCSI target command chaining.
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So now I'm back to trying to guess how a SCSI command terminates re: the relative meanings of a message phase and a status phase.
2019-09-02 23:14:37 -04:00
Thomas Harte
ca08716c52
Introduces real hard disk images to the nascent world of SCSI.
2019-08-25 17:03:41 -04:00
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
