Thomas Harte
57edfe8751
Formalises TODO list and marches onward into execution state.
2020-05-16 18:31:43 -04:00
Thomas Harte
dcc0ee3679
Adds input line capture.
2020-05-16 17:44:15 -04:00
Thomas Harte
f7a16762b4
Starts populating the 68000 state registers.
2020-05-16 00:06:04 -04:00
Thomas Harte
8b76d4007e
Starts adding State for the 68000.
2020-05-14 22:46:40 -04:00
Thomas Harte
c5b746543b
Factors the half mask into steps count.
2020-05-14 00:09:01 -04:00
Thomas Harte
11d936331d
Attempts to preserve scheduled_program_counter_.
2020-05-13 23:58:04 -04:00
Thomas Harte
3709aa7555
Edges almost up to an initially complete implementation.
2020-05-13 22:04:04 -04:00
Thomas Harte
7c9d9ee048
Adds basic Z80 state.
2020-05-13 20:15:22 -04:00
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
