Radosław Kujawa
8de5574aab
Handle accessing bus in zero page relative mode just as in zero page.
...
It should make things less awkward and still work fine, as the only
instructions using this mode are BBS and BBR. These only use first
operand as the address in zero page to read data from.
2017-02-13 18:37:14 +01:00
Radosław Kujawa
0cbbce4eeb
Fix operands fetching for zero page relative addressing.
2017-02-13 09:37:11 +01:00
Radosław Kujawa
7f1c27af75
Fix carry flag handling for SBC.
2017-02-12 23:27:36 +01:00
Radosław Kujawa
23105b4861
Hopefully fix decimal mode handling. Hopefully.
2017-02-12 22:56:07 +01:00
Radosław Kujawa
8f4900a877
Add simplified assemble_single_implied for implied addressing mode.
2017-02-12 21:54:07 +01:00
Radosław Kujawa
0fc79103f8
Well, once again...
2017-02-12 21:51:20 +01:00
Radosław Kujawa
1995569ec1
Fix prototypes for assembler functions.
2017-02-12 21:50:16 +01:00
Radosław Kujawa
0bd7b85dea
Implement simpler to use assembly mode, straight to bus.
...
While here refactor existing assembly functions.
2017-02-12 16:47:06 +01:00
Radosław Kujawa
630daee702
Premilinary support for decimal mode.
...
While here add SED emulation. Implement BCD support for ADC instruction.
2017-02-10 22:23:06 +01:00
Radosław Kujawa
4c7a15f524
Add emulation of WAI instruction.
2017-02-09 21:53:45 +01:00
Radosław Kujawa
5cca703020
Add RTI emulation and test case.
2017-02-08 15:55:39 +01:00
Radosław Kujawa
299b7ee7d8
Add functions to dump stack.
...
Always useful.
2017-02-06 23:16:00 +01:00
Radosław Kujawa
272c4d0b7b
BIT instruction does not affect overflow flag in immediate mode.
2017-02-04 22:07:56 +01:00
Radosław Kujawa
ac48e5435f
Add preliminary support for interrupts.
2017-02-04 21:44:13 +01:00
Radosław Kujawa
51b47d707b
Set reason for stopping the emulation when stepping.
2017-02-03 22:21:43 +01:00
Radosław Kujawa
a255b093e9
Fix overflow flag for SBC.
2017-02-02 22:54:34 +01:00
Radosław Kujawa
1f8db85688
Fix pointer precedence. Should resolve #1 .
2017-02-02 20:58:30 +01:00
Radosław Kujawa
7f7fdad8dc
Enable GDB-specific debug symbols.
2017-02-02 16:22:53 +01:00
Radosław Kujawa
77ce27e4fc
Try to support assembling multi byte instructions.
2017-02-02 15:41:29 +01:00
Radosław Kujawa
9eff6d535b
Add functions to assemble mnemonics into machine code (into buffer).
2017-02-02 14:45:06 +01:00
Radosław Kujawa
941036615e
Add some null pointer checking asserts.
2017-02-02 14:43:44 +01:00
Radosław Kujawa
6711a8fe11
Fix bus space array indexing. Makes bus loading from buffer work.
2017-02-02 14:43:02 +01:00
Radosław Kujawa
3075ed87fa
Add ability to load things onto bus from buffer.
2017-02-02 12:06:41 +01:00
Radosław Kujawa
eb7179f89a
Fix emulation function for nop.
...
Problem introduced by s/'ing mindlessly.
2017-02-02 11:51:32 +01:00
Radosław Kujawa
4e3721ef85
Mark invalid instructions as invalid, not as nops.
2017-02-02 11:23:30 +01:00
Radosław Kujawa
249509fad0
Clean up unused function.
2017-02-02 11:00:32 +01:00
Radosław Kujawa
8e732f3b94
Make SBC somewhat less broken.
2017-02-01 22:15:16 +01:00
Radosław Kujawa
436810b79f
The overflow flag should be represented by "V".
2017-02-01 22:11:24 +01:00
Radosław Kujawa
92418b0f1f
Add SBC emulation.
...
Of dubious quality.
2017-02-01 14:35:50 +01:00
Radosław Kujawa
371856f6c7
Make emul_bbr/bbs/smb/rmb functions static.
...
Since they are only called by wrappers within the same file.
2017-01-31 23:30:49 +01:00
Radosław Kujawa
faa824e306
Implement emulation of ADC, plug the overflow test.
...
While here fix numerous test cases, lol.
2017-01-31 23:08:23 +01:00
Radosław Kujawa
afadfd8b13
Fix pointer usage.
2017-01-31 14:11:21 +01:00
Radosław Kujawa
44f723b016
Attempt to emulate the BRK instruction.
2017-01-31 00:31:28 +01:00
Radosław Kujawa
b21d884f8b
Clear the decimal flag on initialisation.
2017-01-31 00:31:04 +01:00
Radosław Kujawa
bc137b9390
Add emulation of BBR0-7 and BBS0-7 instructions.
2017-01-30 21:25:45 +01:00
Radosław Kujawa
1c72bd23a8
More meaningful comments.
2017-01-30 21:24:45 +01:00
Radosław Kujawa
5554de9411
Add TSB and TRB emulation.
2017-01-29 22:54:06 +01:00
Radosław Kujawa
923a9db649
Add emulation of SMB0-SMB7 instructions.
2017-01-29 21:34:58 +01:00
Radosław Kujawa
3c5162b0b9
Add emulation of branch instructions.
2017-01-29 13:57:51 +01:00
Radosław Kujawa
79b5a01d10
Add forgotten prototype of program_counter_branch().
2017-01-29 13:57:20 +01:00
Radosław Kujawa
e0fa334e3e
Fix relative address pritning in disassembly.
2017-01-29 13:55:53 +01:00
Radosław Kujawa
f5a4f45127
Add function setting the PC for branches.
2017-01-29 13:29:17 +01:00
Radosław Kujawa
762f140efd
Better operand formatting in disassembly.
2017-01-29 13:08:32 +01:00
Radosław Kujawa
bb3f77ec7f
Add JSR and RTS emulation and tests.
2017-01-29 11:47:34 +01:00
Radosław Kujawa
4a8fbfbaeb
Add CPX and CPY emulation and test cases.
2017-01-28 14:04:20 +01:00
Radosław Kujawa
3640a162a3
Add CMP emulation and test cases.
2017-01-28 13:26:51 +01:00
Radosław Kujawa
f3205e7272
Add CLI and SEI emulation and test case.
2017-01-28 11:19:34 +01:00
Radosław Kujawa
ee66f9c78c
Add emulation and test for CLV instruction.
2017-01-28 11:12:25 +01:00
Radosław Kujawa
735c3677ce
Correct address calculation for absolute indirect and absolute indirect X modes.
2017-01-28 00:10:22 +01:00
Radosław Kujawa
8d2d694158
Implement (partial) JMP emulation and basic test for it.
2017-01-27 22:28:33 +01:00
