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
