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8 Commits

Author SHA1 Message Date
Peter Evans
d7148b88bf Relative address was not being calculated correctly. 
The disassembler is using the correct approach, so I adapted it to the
execution code.
 2018-01-09 15:57:37 -06:00
Peter Evans
a8bba409c3 Change 16-bit references to respect little-endianness 
As the Apple II (or rather the 6502 chip) is little-endian, meaning the
least significant byte is the first byte you read going forward, rather
than the last byte.
 2018-01-08 17:10:26 -06:00
Peter Evans
cccf6df354 Move address resolver 2018-01-07 15:47:57 -06:00
Peter Evans
1de1e7788a Rename status flags to MOS_ 2018-01-05 14:18:39 -06:00
Peter Evans
d0dad61db8 Better documentation; use a macro to define modes 2017-12-06 16:54:14 -06:00
Peter Evans
5ada987c83 Add the execute function for the 6502 
This executes a single opcode. Note this also makes a change to the
get_address_resolver function such that accepts an opcode, not the
address mode itself.
 2017-12-05 19:01:43 -06:00
Peter Evans
54473be302 Add functions for instructions, cycles, and address modes. 
This also adds a new table for cycles, and adds unit test functions for
the work as well.
 2017-12-04 23:30:18 -06:00
Peter Evans
3cebed2377 Adding all of the instruction files 2017-12-02 13:05:53 -06:00