Thomas Harte
249b0fbb32
Corrects PC on stack after an illegal instruction.
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Also fixed LOG_TRACE functionality.
2019-05-08 22:36:25 -04:00
Thomas Harte
41740fb45e
Implements video position feedback.
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At a substantial performance cost for now, but I'll worry about that once things are working.
2019-05-08 16:54:19 -04:00
Thomas Harte
0ad88508f7
Removes ROM mirroring above $600000.
2019-05-08 15:07:03 -04:00
Thomas Harte
8293b18278
Adds a TODO on what I think might be an incorrect implementation?
2019-05-08 15:06:40 -04:00
Thomas Harte
2ba0364850
Adds the shift register interrupt.
2019-05-08 15:02:07 -04:00
Thomas Harte
8b72043f33
Ensures no uninitialised variables.
2019-05-08 14:54:54 -04:00
Thomas Harte
2e7bc0b98a
Attempts the shift register.
2019-05-08 14:54:40 -04:00
Thomas Harte
f0f9722ca6
Takes a first crack at the keyboard's serial protocol.
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Albeit that without a working shift register in the VIA, this shouldn't really work yet.
2019-05-08 14:20:28 -04:00
Thomas Harte
b5ef88902b
Edges further towards a functioning keyboard.
2019-05-08 13:58:52 -04:00
Thomas Harte
8278809383
Attempts to get more rigorous on communicating outward control line changes.
2019-05-08 13:33:22 -04:00
Thomas Harte
4367459cf2
Takes a first go at handshake and pulse modes.
2019-05-08 12:48:29 -04:00
Thomas Harte
254132b83d
Eliminates 6522Base in pursuit of working handshake modes.
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Specifically: this means that the places from which the BusHandler may be called are more numerous.
2019-05-08 12:35:17 -04:00
Thomas Harte
7b466e6d0a
Begins work on a functioning keyboard.
2019-05-08 12:34:26 -04:00
Thomas Harte
7e6d4f5a3e
Adds emulation of the real-time clock.
2019-05-08 00:12:19 -04:00
Thomas Harte
ce099a297a
Eliminates RAM writes in ROM area.
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I no longer think that logic is correct.
2019-05-07 17:16:22 -04:00
Thomas Harte
949c848815
Broadens address decoding.
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To no obvious change in output.
2019-05-06 22:57:29 -04:00
Thomas Harte
9bf9b9ea8c
Ensures unmapped peripherals return a consistent value.
2019-05-06 21:32:10 -04:00
Thomas Harte
d8ed8b66f3
Improves carry/extend for ROXL and ROXR.
2019-05-06 21:14:16 -04:00
Thomas Harte
a131d39451
I now believe only the 6522 is on the synchronous bus.
2019-05-06 14:10:13 -04:00
Thomas Harte
b540f58457
Sets a more appropriate display type.
2019-05-05 23:22:05 -04:00
Thomas Harte
4f5a38b5c5
Adds support for the alternate video buffer.
2019-05-05 23:05:24 -04:00
Thomas Harte
cefc3af08b
Corrects RAM read decoding when the ROM overlay is enabled.
2019-05-05 22:48:40 -04:00
Thomas Harte
e6ed50383c
Corrects PEA and MOVE.l (An)[+], (xxx).L; also adds an extra test that caught the latter.
2019-05-05 22:47:54 -04:00
Thomas Harte
96facc103a
Adds an IWM shim and corrects graphics output.
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... now that there is some.
2019-05-05 21:55:34 -04:00
Thomas Harte
407bbfb379
Pretending the Disk II is an IWM doesn't seem to achieve much.
2019-05-05 18:12:25 -04:00
Thomas Harte
a99ebda513
Takes a first shot at (inverted) Mac video output.
2019-05-04 22:27:58 -04:00
Thomas Harte
537b604fc9
It looks like writes should always go to RAM.
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Now I see the screen buffer being filled with `0xffff`s, along with what is probably disk motor control data.
2019-05-04 17:29:30 -04:00
Thomas Harte
98bc570bf7
Adds further boilerplate around VIA and IWM decoding.
2019-05-04 17:12:26 -04:00
Thomas Harte
181b77c490
Adds decoding of IWM accesses and respect for the ROM overlay bit.
2019-05-04 16:38:01 -04:00
Thomas Harte
bc9eb82e6f
Adds in VIA access decoding, and a note to self on video.
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The Mac now proceeds to try to talk to the IWM.
2019-05-04 14:23:37 -04:00
Thomas Harte
29fc024ecd
Starts negotiating the Macintosh memory map.
2019-05-04 12:33:27 -04:00
Thomas Harte
c1695d0910
Adds various notes to self.
2019-05-03 23:55:28 -04:00
Thomas Harte
6d6a4e79c9
Adds the absolute basics to include a 6522 in the Macintosh.
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Not yet wired to anything.
2019-05-03 23:40:22 -04:00
Thomas Harte
417a3e1540
Adds missing call to flush.
2019-05-03 23:31:12 -04:00
Thomas Harte
fa8c804d47
Makes explicit a few implicit type conversions.
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There's plenty more down this well, alas.
2019-05-03 23:26:03 -04:00
Thomas Harte
68392ce6f5
Adds enough of a concept of Mac video to get a properly initialised display.
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Completely empty at present, naturally. Also this is the very first time I've run my 68000 at live speed. From just one data point, it's not terrible. Phew!
2019-05-03 23:25:42 -04:00
Thomas Harte
6873f62ad8
Ensures that the Mac now retains its ROM properly.
2019-05-03 22:39:09 -04:00
Thomas Harte
5f385e15f6
Adds the bare bones necessary to be able to create a Macintosh from File -> New... .
2019-05-03 22:16:07 -04:00
Thomas Harte
8c5d37b6ee
Refactors the AppleII into a sub-namespace to make room for other Apple machines.
2019-05-03 18:14:10 -04:00
Thomas Harte
9c3c2192dd
Merge pull request #611 from TomHarte/68000
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Adds an Initial Emulation of the 68000
2019-05-03 15:08:24 -04:00
Thomas Harte
4f9f73ca81
Corrects tests affected by change in run_for_instructions semantics and new program base address.
2019-05-03 15:05:14 -04:00
Thomas Harte
2c9a1f7b16
Restores vector.
2019-05-03 14:50:07 -04:00
Thomas Harte
0ea4c1ac80
Evicts #includes from my namespace.
2019-05-03 14:48:39 -04:00
Thomas Harte
a873ec97eb
Also previously missing: vector.h.
2019-05-03 14:43:31 -04:00
Thomas Harte
cc8a65780e
Adds further missing includes.
2019-05-03 14:42:36 -04:00
Thomas Harte
c117deb43b
Introduces a couple of missing #includes.
2019-05-03 14:37:05 -04:00
Thomas Harte
ae31d45c88
Introduces the 68000 to SConstruct.
2019-05-03 14:31:09 -04:00
Thomas Harte
a0eb20ff1f
Tweaks divide-by-zero timing.
2019-05-03 14:29:36 -04:00
Thomas Harte
34fe9981e4
Added necessary mea culpas.
2019-05-03 14:25:25 -04:00
Thomas Harte
291e91375f
Takes a shot at the synchronous bus.
2019-05-03 14:20:59 -04:00
