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4,824 Commits 8 Branches 121 Tags 496 MiB
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215 Commits

Author SHA1 Message Date
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
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
Thomas Harte
857f74b320 Fixed: the accepted interrupt level now appears on the bus. 2019-05-02 15:47:12 -04:00
Thomas Harte
1d9608efc7 Alters the order of interrupt bus activity, to bring it into line with a real 68000. 2019-05-02 15:25:43 -04:00
Thomas Harte
93616a4903 Completes test of a vectored interrupt. 
Correcting issues uncovered.
 2019-05-02 00:00:09 -04:00
Thomas Harte
bb07206c55 Corrects internet response to work as currently implemented. 
Also makes corrections to the bus error and address error exceptions.
 2019-05-01 21:59:06 -04:00
Thomas Harte
2e5c0811e7 Makes some effort at getting into interrupt processing. 2019-05-01 15:26:36 -04:00
Thomas Harte
f6ac407e4d Takes further steps towards supporting interrupts. 
Specifically:
* introduces the necessary bus signalling; and
* adds corresponding functional steps.

Still to figure out: getting into and out of an interrupt cycle.
 2019-05-01 15:19:24 -04:00
Thomas Harte
078c3135df The 5/3 split of microcycles appears not accurately to model when lines are tested. 
Therefore I've reverted to a more normative 4:4 form.
 2019-04-30 22:09:13 -04:00
Thomas Harte
92568c90c8 Adds support for HALT as an input, and puts some effort into how to calculate E. 2019-04-30 22:07:48 -04:00
Thomas Harte
f1879c5fbc Corrects interrupt level test within STOP. 2019-04-30 19:32:35 -04:00
Thomas Harte
31bb770fdd Implement STOPpages, waits for DTack, and bus and address error exceptions. 2019-04-30 19:24:22 -04:00
Thomas Harte
e430f2658f Adds a test and by that means fixes divide-by-zero exception return addresses. 2019-04-29 23:09:50 -04:00
Thomas Harte
3060175ff5 Eliminates constructions of std::tuple for performance reasons. 
Specifically: reduces 68000 construction time from 10+ seconds to more like 2.8.
 2019-04-29 22:43:15 -04:00
Thomas Harte
eb4233e2fd Joins some commonalities, shaving about 150 lines of code. 2019-04-29 22:37:23 -04:00
Thomas Harte
6b4c656849 Reverses order of instruction instantiation, reducing total bus step heft by about 11%. 
... since that means inserting more complicated instructions before simpler ones in general, making subset finds more likely.
 2019-04-29 22:20:18 -04:00
Thomas Harte
1b8fada6aa Restores accidentally-cropped functionality. 2019-04-29 22:10:00 -04:00
Thomas Harte
977f9ee831 Takes a run at divide-by-zero exceptions and starts looking towards ways to improve startup time. 2019-04-29 22:08:16 -04:00
Thomas Harte
16fb3b49a5 It leads to a TODO, but implemented decoding and initial setup of STOPpages. 2019-04-29 19:30:00 -04:00
Thomas Harte
3da1b3bf9b Introduces storage for various bus inputs. 2019-04-29 19:22:05 -04:00
Thomas Harte
bc00856c05 Removed TODO; it appears this is just the standard stack frame. 2019-04-29 19:09:20 -04:00
Thomas Harte
52e3dece81 Improves exposition. 2019-04-29 19:07:14 -04:00
Thomas Harte
2c1d8fa18a Adds a check for instruction privilege violation, albeit that I think I need different bus steps. 2019-04-29 19:06:10 -04:00
Thomas Harte
3e34ae67f6 Implements support for the trace flag. 2019-04-29 19:02:59 -04:00
Thomas Harte
ceebecec8d Corrects zero and negative flags for EXT.w. 2019-04-29 17:54:33 -04:00
Thomas Harte
05d1eda422 Fixes crossed-over decoding of EORI and ORI. 2019-04-29 17:45:52 -04:00
Thomas Harte
31f318ad43 Fixes MOVE.bw #, (xxx).w. 2019-04-29 17:41:46 -04:00
Thomas Harte
270f46e147 Normalises CMPl. 2019-04-29 17:27:56 -04:00
Thomas Harte
8564945713 Corrects vector nomination for unrecognised opcodes. 2019-04-29 17:10:33 -04:00
Thomas Harte
7bd7f3fb73 Sign-extends (xxx).w addresses. 2019-04-29 16:55:43 -04:00
Thomas Harte
c466b6f9e7 Factors out the [unit testing] stuff of being a trace-checking 68000 bus handler. 2019-04-29 16:11:01 -04:00
Thomas Harte
d9071ee9f1 Starts sketching out the asynchronous bus. 2019-04-29 13:45:53 -04:00
Thomas Harte
97e118abfa Corrects accidental exclusion of MOVE.bw (xxx).w, [(xxx).w/(xxx).l]. 2019-04-28 23:25:46 -04:00
Thomas Harte
412f091d76 Implements a missing form of BTST. 2019-04-28 23:20:50 -04:00
Thomas Harte
ca1f669e64 Implements MOVEP. 
371 is now the alleged number of missing opcodes. But I'd dare imagine it's more like three or four.
 2019-04-28 22:52:54 -04:00
Thomas Harte
0298b1b3b7 Implements LINK and UNLINK. 
Also starts excluding opcodes that I can't determine the mapping of from the list of those tested against.

Due to those two things together, the latter incomplete: 627 opcodes outstanding. But only STOP and MOVEP remain on my list of things to implement prior to exceptions.
 2019-04-28 17:12:31 -04:00
Thomas Harte
4b1324de77 Takes a run at TRAPV. 
... to leave 1466 as the unimplemented count.
 2019-04-28 15:52:58 -04:00
Thomas Harte
8e8dce9bec Attempts an implementation of CHK. 
1467 is now the official count of things to implement, though I'm starting to get suspicious.
 2019-04-28 15:47:21 -04:00
Thomas Harte
f4350522bf Implements NBCD. 
Now outstanding: 1891.
 2019-04-27 21:29:50 -04:00
Thomas Harte
e2abb66a11 Adds missing addressing modes for ADDA and SUBA. 
... reducing missing opcodes to 1941.
 2019-04-27 17:22:26 -04:00
Thomas Harte
ab5fcab9bf Attempts an implementation of ADDX and SUBX. 
Leaving 2005 non-[A/F]-line instructions.
 2019-04-27 16:57:47 -04:00
Thomas Harte
e75b386f7d Attempts DIVU and DIVS. 
Reportedly leaving 10965 operations now unimplemented.
 2019-04-26 22:22:35 -04:00
Thomas Harte
796203859f Implements PEA. 
This decreases the unimplemented count by 28 from 11841 to 11813.
 2019-04-26 13:49:59 -04:00
Thomas Harte
a3b6d2d16e Corrects test and resolves all instances of opcodes that are valid but shouldn't be. 
The converse case will require implementation of the remaining instructions.
 2019-04-25 22:54:58 -04:00