6502/EightBit
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977 Commits 1 Branch 0 Tags 112 MiB
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Commit Graph

142 Commits

Author SHA1 Message Date
Adrian Conlon
9a0cf0cca8 Tidy extra space 2024-03-06 22:38:26 +00:00
Adrian Conlon
7bfadb05b4 More address mode simplifications 2024-03-06 21:30:27 +00:00
Adrian Conlon
ee9d2bd02b More address mode clarification/simplification 2024-03-06 18:36:09 +00:00
Adrian Conlon
5cf821acb6 More address simplifications 2024-03-05 10:29:01 +00:00
Adrian Conlon
ff01ed5f6f A few small simplifications 2024-03-05 08:56:15 +00:00
Adrian Conlon
8369e0d976 Address calculations are a little easier, if they're always 16-bit 2024-03-04 17:07:22 +00:00
Adrian Conlon
92d677f9d0 Refactor M6502 address mode related code. 2024-03-04 16:58:25 +00:00
Adrian Conlon
2e29233b3b Tidy up of the M6502 page fixup code 2024-03-01 23:18:24 +00:00
Adrian Conlon
0a9a1e5d4c Complete all the undocumente M6502 features. Hurrah! 2024-01-07 16:20:58 +00:00
Adrian Conlon
72be3238f2 Undocumented M6502 instruction implemented 2024-01-07 15:52:16 +00:00
Adrian Conlon
86ef340650 Tidy arithmetic overflow handling in M6502 core 2024-01-07 14:35:12 +00:00
Adrian Conlon
4f4bc5355d Simplification of M6502 flag set/reset code 2024-01-07 14:04:41 +00:00
Adrian Conlon
7eca073a6e Make explicit swallow operations. 2024-01-07 12:15:11 +00:00
Adrian Conlon
22f337569d Looks like the stray tick in the 6502 step method wasn't stray after all! 2024-01-07 11:37:28 +00:00
Adrian Conlon
70c316fd4f Add support for the M6502 undocumented instruction *ANE 2024-01-06 23:10:53 +00:00
Adrian Conlon
3ebc321c59 Add an implementation of the *JAM instruction that passes HarteTest 2024-01-06 22:44:59 +00:00
Adrian Conlon
69a845e2f4 How did that "secret" tick in the M6502 implementation get there??? 2024-01-06 20:53:50 +00:00
Adrian Conlon
9334f6ee93 Fix the ATX implementation in the M6502 core 2024-01-06 13:10:51 +00:00
Adrian Conlon
bd289ed8fb Add a working M6502 ARR implementation 2024-01-06 12:19:02 +00:00
Adrian Conlon
349bada9cc Add undocumented instructions SYA and SXA to M6502 implementation 2024-01-06 09:52:17 +00:00
Adrian Conlon
5d24a136a2 Correct loads of undocumented M6502 instructions 2024-01-05 12:52:27 +00:00
Adrian Conlon
93088b355c M6502: Unify accumulator write page boundary fixup code 2023-12-31 14:58:15 +00:00
Adrian Conlon
e4fbeebfa7 Correct problem in page boundary condition for M6502. 2023-12-31 14:32:16 +00:00
Adrian Conlon
1a5df4c8a7 More "noexcept" specifiers added to M6502 class 2022-01-24 23:00:25 +00:00
Adrian Conlon
8e0092ec9d Tidy up noexcept specification 2022-01-17 19:10:15 +00:00
Adrian Conlon
5522fde9a7 Make the flag manipulations in the 6502 implementatin a little more comprehensible 2021-12-08 19:47:35 +00:00
Adrian Conlon
fed763a802 correct cycle inaccuracies (according to the Harteman tests) in "STA (indirect indexed Y)" 
Signed-off-by: Adrian Conlon <adrian.conlon@gmail.com>
 2021-10-30 22:40:13 +01:00
Adrian Conlon
eeecb7c719 Correct BCD addition handling 
Signed-off-by: Adrian Conlon <adrian.conlon@gmail.com>
 2021-10-30 21:25:56 +01:00
Adrian Conlon
03b536838b Some constexpr improvements in low level classes. 
Signed-off-by: Adrian Conlon <adrian.conlon@gmail.com>
 2021-10-24 11:12:23 +01:00
Adrian Conlon
760f5d5aec Correct filler memoryRead accesses to use PC() rather than the last location read. 
Signed-off-by: Adrian Conlon <adrian.conlon@gmail.com>
 2021-10-10 21:35:26 +01:00
Adrian Conlon
22506ea56c Extensive change warning: lots of "noexcept" and "constexpr" changes. Not sure if I'll keep all of them, but interesting... 
Signed-off-by: Adrian Conlon <adrian.conlon@gmail.com>
 2021-07-18 14:28:40 +01:00
Adrian Conlon
2f76e901f9 More tidying of include files for VS2019 compatibility (plus more correct!) 
Signed-off-by: Adrian Conlon <adrian.conlon@gmail.com>
 2021-05-29 12:18:13 +01:00
Adrian Conlon
cab29e3ce4 Tidy some code formatting. No functional changes. 2021-04-07 21:37:30 +01:00
Adrian Conlon
b1ca06447f Ensure 6502 uses memory rather than bus read/write mechanism 
Signed-off-by: Adrian Conlon <adrian.conlon@gmail.com>
 2021-03-08 16:44:09 +00:00
Adrian Conlon
6285a397ab Tidy 6502 whitespace 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2020-02-22 09:02:37 +00:00
Adrian Conlon
c8bdabf34f Reflect that the I/O for Intel style processors isn't part of the CPU, but attached to the Bus and access controlled by the CPU. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2020-02-09 11:51:58 +00:00
Adrian Conlon
d9466082ec M-Cycle accurate Z80 modifications. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-12-29 01:18:54 +00:00
Adrian Conlon
d0467421ff Improve compatibility with .net emulator code. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-11-09 18:58:23 +00:00
Adrian Conlon
ee3ecc682d Add R/W pins to the MC6809 and MOS6502 processors. Hoping it'll ease peripheral development. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-09-15 12:49:32 +01:00
Adrian Conlon
254cfbe342 Tidied up pin management to be synchronised with the .Net code. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-09-06 23:55:57 +01:00
Adrian Conlon
f0376fa81e Use macros to define our device pins. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-14 23:17:54 +00:00
Adrian Conlon
7f853ec73f Add missing 6502 pin events 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-14 08:26:27 +00:00
Adrian Conlon
92d23d82d6 Start big refactor of device/CPU pin usage (to allow pin events throughout). 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-14 02:10:17 +00:00
Adrian Conlon
68030610d8 Move to an event driven clock tick event for all CPUs 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-09 23:24:33 +00:00
Adrian Conlon
8b187e7614 The clock still has to tick, even while held on RDY low, otherwise cycle timing won't work. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-09 09:05:12 +00:00
Adrian Conlon
a90ca6ba38 Move RDY initialisation to the CPU power-on sequence. Not strictly correct, but OK. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-09 00:33:56 +00:00
Adrian Conlon
01175cf9eb Add support for emulated SYNC and RDY lines. Untested, but feel close. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-08 23:55:27 +00:00
Adrian Conlon
047babbe7c Rearrange the RESET handler for cycle accuracy. Use more of the general interrupt handler, but with "dummy" stack write access. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-08 23:09:52 +00:00
Adrian Conlon
25321e78e7 Now that HALT/RESET/NMI/IRQ and BRK have a unified architecture, I think this wraps up the instruction handler of the 6502. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-08 01:32:43 +00:00
Adrian Conlon
3faec680b0 I think this fixes one of my NES issues. The fix-up required for the PC is handled by the fetchByte associated with the BRK instruction. 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
 2019-01-07 01:28:23 +00:00