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[SIM65] Support undocumented opcodes for 6502

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This PR is mostly a complete rewrite of the emulator for 6502/65c02 opcodes.
It provides an easier to maintain implementation of the instructions, by using few macros rather than having hand-written code for each function.
All undocumented, previously missing opcodes for 6502 are also implemented.
The patch also includes a detailed documentation of those opcodes, for reference to developers.
This PR should fix one of the milestones listed here for the next version of CC65:

https://github.com/cc65/wiki/wiki/Before-the-next-release
This commit is contained in:
Carlo Bramini
2024-01-04 13:12:52 +01:00
committed by Carlo Bramini
parent 75461e1319
commit b04d79b1da
5 changed files with 1805 additions and 925 deletions
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asminc/cpu.mac
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@@ -15,7 +15,7 @@ CPU_ISET_4510 = $0400
CPU_NONE = CPU_ISET_NONE
CPU_6502 = CPU_ISET_6502
CPU_6502X = CPU_ISET_6502|CPU_ISET_6502X
CPU_6502DTV = CPU_ISET_6502|CPU_ISET_6502X|CPU_ISET_6502DTV
CPU_6502DTV = CPU_ISET_6502|CPU_ISET_6502DTV
CPU_65SC02 = CPU_ISET_6502|CPU_ISET_65SC02
CPU_65C02 = CPU_ISET_6502|CPU_ISET_65SC02|CPU_ISET_65C02
CPU_65816 = CPU_ISET_6502|CPU_ISET_65SC02|CPU_ISET_65816