Thomas Harte
4467eb1c41
Ensure relevant throwaway stack reads use the previous stack address.
...
TODO: can CycleFetchPreviousThrowaway be used more widely?
2022-06-24 14:00:03 -04:00
Thomas Harte
a23b0f5122
Map STA (d), y to correct calculator.
2022-06-23 20:57:47 -04:00
Thomas Harte
944e5ebbfa
Take another run at IO addresses.
2022-06-22 15:28:11 -04:00
Thomas Harte
7dcfa9eb65
65816: improve decimal calculations, posted IO addresses, read/write during redundant read-modify-write cycle.
2022-06-21 14:33:06 -04:00
Thomas Harte
ec98736bd7
Ensure IO cycles don't produce an address of (PC+1).
2022-06-21 11:41:05 -04:00
Thomas Harte
574a37814c
Attempts to fix exception selection and timing.
2020-12-08 18:46:30 -05:00
Thomas Harte
9e0e063f8a
Resolves one further GCC warning.
...
Technically this leaves one further, on a temporary printf I have in my IIgs. I'll fix that when I strip all this caveman stufff.
2020-11-22 21:57:48 -05:00
Thomas Harte
d3c7253981
Shifts size-limiting of X and Y to transitions and mutations, away from reads.
...
Primarily to remove potential bug-causing complexity — this is easier to debug. But let's see.
2020-11-04 20:35:41 -05:00
Thomas Harte
5cbb91f352
Fixes COP vector, ensures WDM skips a byte.
2020-11-03 20:01:02 -05:00
Thomas Harte
bf85d71674
Brings ADC into conformance. Fixes JML.
2020-11-03 18:12:10 -05:00
Thomas Harte
0178aaee2b
Attempts retroactively to enforce the rule that 8-bit index modes => no top byte.
...
(Rather than a preserved but ignored top byte)
2020-11-02 18:55:28 -05:00
Thomas Harte
e8943618dc
Adds some extra commentary and distinguishes X/Y sizing from M.
2020-10-31 10:21:13 -04:00
Thomas Harte
1ae2f6f449
PHD and PLD should always be 16-bit; PLP 8-bit.
2020-10-31 09:22:35 -04:00
Thomas Harte
88e26b42f5
Fixed: PHP pushes only 8 bits regardless of mode.
2020-10-30 22:36:00 -04:00
Thomas Harte
266022b193
Fixes PEA.
2020-10-28 22:00:28 -04:00
Thomas Harte
1df2ce513a
Ensures that reset doesn't push to the stack.
2020-10-28 21:23:35 -04:00
Thomas Harte
1e4679ae14
Corrects JSL and RTL.
2020-10-28 17:25:40 -04:00
Thomas Harte
b3ab9fff9b
Imports a custom-built copy of Klaus Dormann's 65C02 test, with only 65816-compatible parts.
...
Thereby fixes another couple of 65816 issues — BRK(, etc) not clearing the decimal flag, and `TRB d` being mismapped.
2020-10-19 19:27:16 -04:00
Thomas Harte
14718b93a4
Improve commentary.
2020-10-19 09:32:50 -04:00
Thomas Harte
99eba2f8ba
Ensures intended 65816 exception behaviour.
...
i.e. the relevant micro-op sequence exists, and its operation isn't lost. Also sets the 65816 by default to jump straight into power-on, not to execute an instruction first. That shouldn't make a functional difference, but it makes debugging easier because it makes startup fully deterministic.
2020-10-18 14:43:47 -04:00
Thomas Harte
3b398f7a9a
Attempts to complete all 65816 bus signalling.
2020-10-16 21:56:20 -04:00
Thomas Harte
096add7551
Exposes non-BusOperation bus outputs.
2020-10-16 21:05:42 -04:00
Thomas Harte
c0a1c34012
Wraps all registers into a struct, so that I can implement abort.
...
Makes some preparations for ready too.
2020-10-15 18:42:38 -04:00
Thomas Harte
27afb8f0a7
Adds direct indirect long test, and thereby fixes addressing mode.
...
Nine to go!
2020-10-14 21:26:20 -04:00
Thomas Harte
b22aa5d699
Starts transcribing the addressing examples I have into tests.
...
Correspondingly extends the exposed register set and test-machine addressing range.
2020-10-13 21:38:30 -04:00
Thomas Harte
8f5537aaaa
Attempts to resolve my direct-indirect addressing stumble.
2020-10-13 20:21:53 -04:00
Thomas Harte
a15d4a156b
Starts trying to ensure appropriate address wrapping.
2020-10-12 22:33:43 -04:00
Thomas Harte
7479dc74ed
Removes printf. It's no longer telling me anything.
2020-10-12 21:52:58 -04:00
Thomas Harte
28da1a724a
Introduces Jeek816 test case.
2020-10-12 21:43:44 -04:00
Thomas Harte
f529eadbec
Corrects 16-bit read-modify-write.
...
Subject to the TODO proviso on 'correct'; has my 6502 prejudice pushed me into unrealistic bus signalling?
2020-10-12 18:36:09 -04:00
Thomas Harte
5dc3cd3a2f
Starts using Jeek816 for a basic native-mode audit. Fixes absolute long addressing.
2020-10-11 22:02:46 -04:00
Thomas Harte
a0885ab7d0
Implements STP and WAI.
...
Albeit still without fully-implemented reactions to exceptions in general.
2020-10-11 17:56:55 -04:00
Thomas Harte
8eaf1303a3
Attempts proactively to ensure proper RTI behaviour on the 65816.
2020-10-11 15:25:13 -04:00
Thomas Harte
20cbe72985
Ties to 8- or 16-bit those instructions that aren't M/X-dependent.
...
This is technically redundant for PEI, PEA and PER since they have dedicated bus programs anyway, but it's good to be explicit.
2020-10-11 14:38:35 -04:00
Thomas Harte
b8848d8580
Implements TCD, TDC, TCS, TSC.
2020-10-10 21:43:05 -04:00
Thomas Harte
ae87728770
Ensures M and X are exposed to the public interface.
2020-10-10 21:33:56 -04:00
Thomas Harte
28c8ba70c1
Implements REP and SEP and exposes the MX flags generally.
2020-10-10 21:23:59 -04:00
Thomas Harte
6892ac13e8
Corrects BIT. All 65816-applicable Wolfgang Lorenz tests now pass.
2020-10-10 17:47:33 -04:00
Thomas Harte
d17c90edf7
Corrects ROL d, x.
2020-10-10 11:25:14 -04:00
Thomas Harte
7966592fae
Corrects ROL d.
2020-10-10 11:22:23 -04:00
Thomas Harte
92e72959c3
Makes corrections to ix addressing mode and shift/roll flags.
2020-10-09 23:12:20 -04:00
Thomas Harte
451f83ba51
Corrects emulation-mode read-modify-writes not to empty the data buffer.
2020-10-09 22:14:42 -04:00
Thomas Harte
0ed98cbfac
Attempts to fix direct indirect indexed; not yet successful I think.
2020-10-08 22:15:19 -04:00
Thomas Harte
7dde7cc743
Implements altered direct indexed addressing in emulation mode.
2020-10-08 22:02:14 -04:00
Thomas Harte
f8004d7096
Implements RTI, corrects TAY.
2020-10-08 18:06:11 -04:00
Thomas Harte
0418f51ef2
Takes a shot at emulation-mode 'exceptions'.
...
It's just RTI and correct decimal SBC left of the official 6502s now, I think.
2020-10-08 17:52:13 -04:00
Thomas Harte
054e0af071
Corrects RTS behaviour: the return address on the stack is off by one.
...
Dormann's tests now proceed to a BRK.
2020-10-08 16:55:45 -04:00
Thomas Harte
907c3374c3
Attempts to clean up my JMP/JSR mess.
...
Also takes a step forwards in decimal SBC, but it's not right yet.
2020-10-08 16:48:46 -04:00
Thomas Harte
b608e11965
Realises that not all non-incrementing PC fetches should be thrown away.
2020-10-07 20:06:27 -04:00
Thomas Harte
e68b3a2f32
Corrects JMP program.
2020-10-07 19:59:29 -04:00
