Peter Evans
7f6b8d3587
We can no longer assume PC increments during address handling
...
This change required a number of consequent changes to assumptions we'd
made, and I'm not 100% confident we have things right at this point in
time.
2018-01-09 20:59:14 -06:00
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
