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896 Commits

Author SHA1 Message Date
Thomas Harte
66c2eb0414 Further tightens const and constexpr usage. 2020-05-12 22:22:21 -04:00
Thomas Harte
25996ce180 Further doubles down on construction syntax for type conversions. 2020-05-09 23:00:39 -04:00
Thomas Harte
cc357a6afa Removes boilerplate from header. 2020-04-02 19:15:57 -04:00
Thomas Harte
dfc1c7d358 Separates 6502 State object to make it optional. 
Also makes a few minor const improvements while I'm poking around.
 2020-04-02 19:11:27 -04:00
Thomas Harte
7ed8e33622 Eliminates unused 6502 counter. 2020-04-02 18:49:28 -04:00
Thomas Harte
a491650c8b Adds safety asserts. 2020-03-30 21:39:31 -04:00
Thomas Harte
95c68c76e1 Corrects use of StructImpl. 2020-03-30 00:27:40 -04:00
Thomas Harte
edc553fa1d Removes duplicative 'register'. 2020-03-29 22:58:00 -04:00
Thomas Harte
4f2ebad8e0 Takes a shot a set_state. 2020-03-29 22:50:30 -04:00
Thomas Harte
cfb75b58ca Pulls all 6502 MicroOp sequences into the main operations_ table. 
This will make state restoration somewhat more tractable.
 2020-03-29 18:36:41 -04:00
Thomas Harte
4fbe983527 Provisionally adds State and get_state to the 6502. 
`set_state` may be a little more complicated, requiring a way to advance in single-cycle steps **without applying bus accesses**.
 2020-03-28 00:33:27 -04:00
Thomas Harte
a51fe70498 Standardises cast syntax. 2020-03-06 21:55:00 -05:00
Thomas Harte
b971e2a42c Adds get_is_resetting to the Z80, eliminating the CPC's custom version. 2020-02-29 19:58:25 -05:00
Thomas Harte
01faffd5bf Corrects memptr behaviour of OTIR/OTDR and INIR/INDR. 
This seemingly perfects memptr.
 2020-02-27 20:55:43 -05:00
Thomas Harte
26de5be07c Corrects memptr behaviour of LDIR/LDDR and CPIR/CPDR. 2020-02-27 20:44:53 -05:00
Thomas Harte
87474d5916 Corrects memptr behaviour of OUT (C), 0. 2020-02-27 20:38:27 -05:00
Thomas Harte
06163165d9 Corrects memptr effect of LD rr, (nn). 2020-02-26 22:22:54 -05:00
Thomas Harte
ec82c075be Fixes memptr for IN C, (C). 2020-02-26 22:19:37 -05:00
Thomas Harte
3b0df172a7 Corrects memptr behaviour of JP nn. 2020-02-26 22:02:15 -05:00
Thomas Harte
7058dbc3cc Corrects memptr for LD HL, (nn). 2020-02-26 21:54:49 -05:00
Thomas Harte
b64de89d2d Corrects JR memptrs. 2020-02-26 21:47:34 -05:00
Thomas Harte
8878396339 Corrects DJNZ memptr behaviour. 2020-02-26 21:42:31 -05:00
Thomas Harte
3097c4ccae Improves MEMPTR testing and some results. 2020-02-24 23:32:18 -05:00
Thomas Harte
7959d243f6 Adds single-stepping. Of a kind. 2020-02-24 23:31:42 -05:00
Thomas Harte
79dd402bc8 Consolidates different test port input selection. 2020-02-23 16:12:28 -05:00
Thomas Harte
3f3229851b Implements MEMPTR for IN. 2020-02-23 00:32:33 -05:00
Thomas Harte
dca79ea10e Requires trace flag currently set. 2020-01-18 22:52:53 -05:00
Thomas Harte
b7fd4de32f Ensures a one-instruction latency on the trace flag. 2020-01-18 22:06:00 -05:00
Thomas Harte
9f2f547932 Adds and satisfies test on the function code word. 
Thanks to ijor's "68000 Address and Bus Error Stack Frame" re: contents.
 2020-01-04 23:58:07 -05:00
Thomas Harte
f0d5bbecf2 Introduces a test of stack contents after an address error. 
Fixes: stacked PC, address of fault.
 2020-01-04 23:22:07 -05:00
Thomas Harte
a28c52c250 Fixes A7-relative JSRs. 
I completely withdraw my earlier statement re: the test cases.
 2020-01-04 22:22:33 -05:00
Thomas Harte
7de1181213 Make a new guess at post-overflow DIV flags, based on tests. 
Specifically: for DIVU, stick with the current guess of a fixed set. For DIVS, leave N and Z alone.
 2020-01-03 23:44:49 -05:00
Thomas Harte
c7a5b054db There's no TODO here; overflow is always 0 for a 16x16 multiply. 
... and the original 68000 doesn't support 32x32 multiplies.
 2020-01-03 22:44:19 -05:00
Thomas Harte
2f8078db22 Switches to should_log as a global when I'm hacking about. 2020-01-02 20:15:48 -05:00
Thomas Harte
5be30b1f7b Introduces further comparative tests, prompting a new CHK fix. 
Specifically: how to set N when both is_under and is_over are true, and to eliminate a failure fully to prefetch in the longer addressing modes.
 2020-01-01 19:11:36 -05:00
Thomas Harte
b184426f2b Ensure that an interrupt from a STOP doesn't return to the STOP. 2020-01-01 14:51:47 -05:00
Thomas Harte
1de4f179c0 Adds more thorough comment on the bus program used. 2019-12-25 19:49:49 -05:00
Thomas Harte
3cb5684d95 Fixes RTR: the whole top half of the SR should be preserved. 
Specifically, the 68000 Reference Manual says: "The supervisor portion of the status register is unaffected." Clearly when I first read that I misread it as the supervisor _flag_ (rather than _portion_) should be preserved.
 2019-12-25 19:49:20 -05:00
Thomas Harte
274867579b Deploys constexpr as a stricter const. 2019-12-22 00:22:17 -05:00
Thomas Harte
cf16f41939 Makes value8_high/low and value16 branchless. 2019-12-21 20:58:37 -05:00
Thomas Harte
08f2877382 I think the 68000 actually loads a byte value onto both the upper and lower data lines. 2019-12-21 20:37:03 -05:00
Thomas Harte
a3e64cae41 Corrects SBCD carry. 2019-12-17 22:16:02 -05:00
Thomas Harte
8a2ac87209 Reverted SBCD/NBCD V behaviour. 2019-12-16 23:08:59 -05:00
Thomas Harte
096b447b4b Corrects MOVE -(An), SR/CCR, which was not previously decrementing. 
Also adds a safety check against other instances of the same error. There seem to be none.
 2019-12-16 22:38:54 -05:00
Thomas Harte
84167af54f Corrects CHK N flag. 2019-12-16 20:01:33 -05:00
Thomas Harte
8be26502c4 Fixes NBCD -(An)+, adds some additional comments. 2019-12-16 20:01:19 -05:00
Thomas Harte
4c068e9bb8 Corrects flags on CMPA.w. 2019-12-15 20:39:47 -05:00
Thomas Harte
dc1abd874e Corrects indentation typo. 2019-12-14 23:52:53 -05:00
Thomas Harte
4dd235f677 Adds supervisor/user to logged flags in trace mode. 2019-12-08 22:39:10 -05:00
Thomas Harte
407cc78c78 Extends to offer simpler 8-bit access handling. 2019-12-08 20:19:44 -05:00
Thomas Harte
b12136691a Corrects comment. 2019-11-18 23:46:33 -05:00
Thomas Harte
db03b03276 Corrects [AND/OR/EOR].bw Dn, -(An) to decrement destination. 
It was previously doing a predecrement on the internal source address, which is unused. This fixes at least Dan Dare III and Silkworm.
 2019-11-09 11:25:23 -05:00
Thomas Harte
6afefa107e Resolves unused variable warning. 2019-11-05 23:18:25 -05:00
Thomas Harte
07582cee4a BusGrant is a further signal I will need. 2019-11-03 21:10:42 -05:00
Thomas Harte
a67e0014a4 Fixes video base address and mono/colour monitor value. 
Now I see a GEM desktop. In blue.
 2019-11-02 19:36:15 -04:00
Thomas Harte
c070f2100c Attempts to regularise data bus access. 2019-11-01 23:01:06 -04:00
Thomas Harte
1c154131f9 Expands size of storage in Cycles/HalfCycles; adjusts widely to compensate. 2019-10-29 22:36:29 -04:00
Thomas Harte
ecc0cea5a1 Added a potential branch for the newer TOS memory map. 2019-10-26 16:52:06 -04:00
Thomas Harte
8a14f5d814 Updates to Xcode11 recommended project settings. 
The updated compiler also flagged a potential issue with CPU::Z80::Register not being a namespace re: 'Refresh' versus CPU::Z80::PartialMachineCycle. I don't entirely see it, but this fixes the problem.

I also finally figured out what the compiler was trying to tell me about ROMRequester.xib.
 2019-09-22 12:13:56 -04:00
Thomas Harte
6a80832140 Moves timing of interrupt sampling into prefetch queue advancement. 
As per comment, that is definitely the only place it can occur; I don't know whether it always occurs there.
 2019-08-04 21:06:34 -04:00
Thomas Harte
35b1a55c12 Corrects DIVS negative flag. 2019-08-04 20:36:33 -04:00
Thomas Harte
e3794c0c0e Takes a second pass at DIVS timing, seeming to correct that side of things. 2019-08-04 20:33:43 -04:00
Thomas Harte
478f2533b5 Corrects 68000 address bus during interrupt acknowledge. 
All unused bits should be 1, not 0.
 2019-08-03 15:38:36 -04:00
Thomas Harte
b7b62aa3f6 Resolves some type conversion warnings. 2019-07-26 23:20:40 -04:00
Thomas Harte
5769944918 Shrinks MicroOp struct size from 16 bytes to 4. 2019-07-25 10:14:36 -04:00
Thomas Harte
9ef1211d53 Adds missing header file. 2019-07-24 22:13:32 -04:00
Thomas Harte
f2ae04597f Updates test case. 2019-07-24 22:07:17 -04:00
Thomas Harte
1327de1c82 Slims the Program struct down to 8 bytes total. 2019-07-24 22:02:50 -04:00
Thomas Harte
827c4e172a Cuts a third from the Program struct. 
Observation: [source/destination]_address are always one of the address registers. So you can fit both within a single byte.

Net effect: around a 12% reduction in execution costs, given that this reduces the size of the instructions table from 3mb to 2mb.
 2019-07-24 18:39:36 -04:00
Thomas Harte
c300bd17fa Regularises as many source/destination sets as fit the current setter. 2019-07-24 18:22:44 -04:00
Thomas Harte
0187fd8eae Hides all runtime Program member accesses behind macros. 
... and fixes unit tests.
 2019-07-24 12:01:30 -04:00
Thomas Harte
4aca6c5ef8 Adds a note of admission here. 2019-07-23 23:03:15 -04:00
Thomas Harte
fa226bb1b9 Seeks to reduce enquiry costs. 2019-07-17 15:09:26 -04:00
Thomas Harte
cac97a9663 Devolves drive responsibility. 2019-07-10 22:39:56 -04:00
Thomas Harte
2ccb564a7b Throws some extra logging into place, to test the IWM changeover. 2019-07-10 21:39:45 -04:00
Thomas Harte
ed4ddcfda8 Reduces call/return overhead on Microcycle methods. 2019-07-09 19:55:30 -04:00
Thomas Harte
69b94719a1 Switches to faster bit count logic. 2019-07-09 18:41:20 -04:00
Thomas Harte
5078f6fb5c Marginally reduces MOVE heft. 2019-07-09 18:07:11 -04:00
Thomas Harte
94457d81b6 Eliminates redundant and integer-size-troubling AND on ASL. 2019-07-08 18:33:50 -04:00
Thomas Harte
fb352a8d40 Ensures assert is completely excluded if NDEBUG. 2019-07-08 18:00:37 -04:00
Thomas Harte
b9c2c42bc0 Switches drives to using floats for time counting. 
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
c4cbe9476c Corrects EA selection logic, fixing MOVEP. 2019-07-02 13:54:21 -04:00
Thomas Harte
0a67cc3dab Goes nuclear on ROXL and ROXR. 2019-07-01 23:05:48 -04:00
Thomas Harte
726e07ed5b Corrects ASL overflow flag. 2019-07-01 19:46:58 -04:00
Thomas Harte
11d8f765b2 Corrects divide-by-zero exception length, enables all other DIVS checks. 2019-07-01 15:46:04 -04:00
Thomas Harte
514e57b3e9 Corrects DIVU timing and flags, improves DIVS. 2019-07-01 14:24:32 -04:00
Thomas Harte
d8fb6fb951 Corrects MULU timing. 2019-06-30 22:40:10 -04:00
Thomas Harte
255f0d4b2a Corrects MULS timing. 2019-06-30 22:33:54 -04:00
Thomas Harte
8d0cd356fd Corrects TRAP, TRAPV and CHK timing. 2019-06-29 21:25:22 -04:00
Thomas Harte
17666bc059 Corrects CHK flags. 2019-06-28 19:48:53 -04:00
Thomas Harte
241d29ff7c Imports SBCD and NBCD tests, and fixes corresponding operation. 2019-06-28 19:39:08 -04:00
Thomas Harte
c5039a4719 Imports ANDI, ORI and EORI to SR tests. 
Hence corrects supervisor/user privileges for SR/CCR.
 2019-06-28 15:05:46 -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
d81053ea38 Invents some additional PEA tests, and further fixes PEA. 2019-06-27 17:59:03 -04:00
Thomas Harte
8d39c3bc98 Takes a shot at fixing PEA for A7-relative addresses. 
Unit tests required. Tomorrow.
 2019-06-26 23:24:54 -04:00
Thomas Harte
c0591090f5 Imports DIVU tests. 2019-06-26 22:25:48 -04:00
Thomas Harte
538aecb46e Imports CMP tests, and fixes CMP.l timing. 2019-06-26 22:02:04 -04:00
Thomas Harte
dbdbea85c2 Imports CMPA tests, and fixes CMPA.w. 2019-06-26 21:42:48 -04:00
Thomas Harte
ba2224dd06 Imports NEGX tests and thereby fixes NEGX's zero flag. 2019-06-26 19:39:04 -04:00
Thomas Harte
79066f8628 Imports NOT tests, fixes NOT overflow and carry flags. 2019-06-25 22:18:11 -04:00
Thomas Harte
2c813a2692 Imports CMPM tests and fixes CMPM.bw source/destination order. 2019-06-25 21:46:01 -04:00
Thomas Harte
d2cb595b83 Proactively attempts to fix CMPM PostInc addressing. 2019-06-25 21:24:03 -04:00
Thomas Harte
ecb5a0b8cc Incorporates ADDX tests and fixes ADDX PreDec. 2019-06-25 19:18:07 -04:00
Thomas Harte
e12e8fc616 Incorporates ASR tests, and fixes ASR (xxx).w. 
... which was re-injecting the wrong bit to preserve sign.
 2019-06-25 18:44:31 -04:00
Thomas Harte
1fbbf32cd2 Adds ASL tests, and corrects ASL (xxx).w. 
Overflow is wrong on other ASLs though, I think.
 2019-06-25 18:09:01 -04:00
Thomas Harte
31edb15369 Reduces 68000 startup costs a little further. 2019-06-25 17:41:13 -04:00
Thomas Harte
e830d23533 Incorporates TRAPV tests. 2019-06-24 21:21:35 -04:00
Thomas Harte
9a666fb8cc Imports NEG tests and fixes NEG.l Dn timing. 2019-06-24 19:43:30 -04:00
Thomas Harte
0e208ed432 Fixes cycle counting in the test machine. 2019-06-24 17:55:09 -04:00
Thomas Harte
c8b769de8a Completes import of LSL tests and fixes various LSL issues. 
Including LSL (xxx).w actually being LSR, and the carry flag generally being questionable.
 2019-06-24 17:45:38 -04:00
Thomas Harte
c447655047 Resolves assumption that shifts greater than the bit count of the relevant int are well-defined in C. 2019-06-24 16:51:43 -04:00
Thomas Harte
3ec9a1d869 Incorporates JMP tests, fixes JSR (xxx).l timing. 2019-06-24 15:36:33 -04:00
Thomas Harte
faef917cbd Improves resizeable microcycle test. 2019-06-24 10:55:22 -04:00
Thomas Harte
d27ba90c07 Attempts to introduce more rigour to variable-length instruction handling. 2019-06-24 10:43:28 -04:00
Thomas Harte
db4ca746e3 Introduces BSET tests, fixes BSET timing. 2019-06-23 22:53:37 -04:00
Thomas Harte
d50fbfb506 Imports EXG and PEA tests, and fixes EXG timing. 2019-06-23 22:21:25 -04:00
Thomas Harte
86fdc75feb Incorporates RTR test, adding a ProcessorState helper. 2019-06-23 18:37:32 -04:00
Thomas Harte
b63231523a Completes import of ROL tests. 2019-06-23 17:33:12 -04:00
Thomas Harte
70e296674d Starts import of ROL tests. 
Including time tests, this time.
 2019-06-22 22:42:57 -04:00
Thomas Harte
8c8493bc9d Ensures proper loading of the SP at reset. 2019-06-21 18:20:26 -04:00
Thomas Harte
ccfe1b13cb Imports DIVS, MULS and MOVE from SR tests. 
Not all passing.
 2019-06-21 16:03:11 -04:00
Thomas Harte
0c1c10bc66 Introduces a test that proves that DIVS' attempt to set proper timing isn't working. 2019-06-20 19:29:02 -04:00
Thomas Harte
fafd1801fe Introduces first DIVS test, and associated fixes. 2019-06-20 19:02:03 -04:00
Thomas Harte
79d8d27b4c Reintroduces use of locations_by_bus_step_ to decrease 68000 construction time. 2019-06-20 15:10:11 -04:00
Thomas Harte
440f52c943 Incorporates TRAP test. 2019-06-19 21:18:30 -04:00
Thomas Harte
91ced056d2 Adds tests for ADD. No failures. 2019-06-19 18:56:21 -04:00
Thomas Harte
8dace34e63 Imports third-party tests for ABCD, and thereby fixes ABCD. 2019-06-19 18:13:06 -04:00
Thomas Harte
8182b0363f Adds enum to help with status decoding. 2019-06-19 17:01:49 -04:00
Thomas Harte
c5b036fedf Ensures aborted decodes don't overwrite prior correct ones. 2019-06-19 17:00:44 -04:00
Thomas Harte
e26ddd0ed5 Corrects address fetches for CMPI.l #, (xxx).w. 2019-06-19 13:52:56 -04:00
Thomas Harte
ca83431e54 Fixed: Scc is a byte operation. 
It was, until now, post-incrementing and pre-decrementing registers other than A7 incorrectly.
 2019-06-19 13:15:12 -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
bde975a3b9 Possibly mights the tiniest bit of headway with 'the IWM'. 
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
Thomas Harte
59a94943aa Resolves final set of build warnings. 2019-06-13 10:55:29 -04:00
Thomas Harte
bf4889f238 Reduces warnings to 6. 2019-06-13 10:43:00 -04:00
Thomas Harte
7cc5afd798 Eliminates another couple of implicit type conversion warnings. 2019-06-13 10:30:26 -04:00
Thomas Harte
11ab021672 Further reduces implicit conversion warnings, to 17. 2019-06-13 10:27:49 -04:00
Thomas Harte
feafd4bdae Eliminates further type conversion warnings. 2019-06-13 10:20:17 -04:00
Thomas Harte
d6150645c0 By hook or by crook, mouse input now works. 2019-06-12 22:19:25 -04:00
Thomas Harte
ec5701459c Makes various temporary logging changes. 2019-06-11 19:54:07 -04:00
Thomas Harte
697e094a4e Sketches out the absolute basics of an SCC interface. 2019-06-08 18:47:11 -04:00
Thomas Harte
e9d0676e75 Fiddles further with the tachometer. 2019-06-06 21:36:19 -04:00
Thomas Harte
7591906777 Numerous IWM fixes: the machine now seems to be trying to measure the tachometer. 2019-06-06 18:32:11 -04:00
Thomas Harte
058fe3e986 Fixes some other low-hanging warning fruit. 2019-06-04 16:47:10 -04:00
Thomas Harte
51ee83a427 Resolves a further 11 conversion errors. 2019-06-04 16:34:45 -04:00
Thomas Harte
5b21da7874 Reduces number of warnings to 70. 2019-06-04 16:27:09 -04:00
Thomas Harte
bd7f00bd9c Resolves a further handful of implicit type conversion warnings. 2019-06-04 15:43:44 -04:00
Thomas Harte
4d4ddded6d Fixes register-relative JMP and JSR. 2019-06-03 15:29:50 -04:00
Thomas Harte
881feb1bd3 Adds preliminary parsing of the Disk Copy 4.2 format. 2019-06-02 13:39:25 -04:00
Thomas Harte
035f07877c Reduces conversions to vector. 2019-05-30 12:08:35 -04:00
Thomas Harte
b3d2b4cd37 Fixes the interrupt return address. 2019-05-29 20:27:46 -04:00
Thomas Harte
c86fe9ada9 Ensures replace_write_values works in release builds. 2019-05-29 19:00:53 -04:00
Thomas Harte
ecf93b7822 Eliminates some type conversion warnings. 2019-05-29 14:56:50 -04:00
Thomas Harte
541b75ee6e Further fixes PEA, and OR/AND/EOR Dn, (An). 2019-05-29 14:37:15 -04:00
Thomas Harte
77b08febdb Corrects PEA and adds an additional debugging aid. 2019-05-29 12:47:17 -04:00
Thomas Harte
fcda376f33 Removes three further type conversion warnings. 2019-05-28 21:56:49 -04:00
Thomas Harte
0848fc7e03 Ensures the Mac uses auto vectored interrupts. 2019-05-28 16:24:41 -04:00
Thomas Harte
3bb8d6717f Ensures A7 is correct at end of an UNLINK. 2019-05-28 16:02:42 -04:00
Thomas Harte
5e2496d59c Simplifies and corrects MOVE logic. 2019-05-28 15:17:03 -04:00
Thomas Harte
c52da9d802 Adds some logging preparatory to a MOVE change. 2019-05-28 15:05:42 -04:00
Thomas Harte
0b999ce0e4 Attempts to fix register-relative JSRs. 2019-05-09 06:43:07 -04:00
Thomas Harte
b04bd7069d Corrects Scc and DBcc (xxx).l and (xxx).w. 2019-05-09 06:28:55 -04:00
Thomas Harte
249b0fbb32 Corrects PC on stack after an illegal instruction. 
Also fixed LOG_TRACE functionality.
 2019-05-08 22:36:25 -04:00
Thomas Harte
d8ed8b66f3 Improves carry/extend for ROXL and ROXR. 2019-05-06 21:14:16 -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
417a3e1540 Adds missing call to flush. 2019-05-03 23:31:12 -04:00
Thomas Harte
fa8c804d47 Makes explicit a few implicit type conversions. 
There's plenty more down this well, alas.
 2019-05-03 23:26:03 -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
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