Peter Evans
b21b48cac0
Fix a couple of issues...
...
1. The execute function should not be incrementing the PC register, as
this happens in other places.
2. The push_ and pop_stack functions were not considering that the data
should be in little-endian order.
2018-01-08 21:22:29 -06:00
Peter Evans
1c36c4ea4d
Add missing docblock comments
2018-01-07 16:07:29 -06:00
Peter Evans
cccf6df354
Move address resolver
2018-01-07 15:47:57 -06:00
Peter Evans
af7dae6924
Advance PC by # of bytes consumed
2018-01-05 15:52:20 -06:00
Peter Evans
c7aa9e9fc3
Resolver may be NULL; don't call if so
...
This change also registers a default value for operand (0).
2018-01-05 14:57:38 -06:00
Peter Evans
1de1e7788a
Rename status flags to MOS_
2018-01-05 14:18:39 -06:00
Peter Evans
8f04deb642
Comment out unused cycles variable
2018-01-01 17:12:25 -06:00
Peter Evans
f70f21789b
Add flash memory, disassemble options
2017-12-31 15:50:59 -06:00
Peter Evans
26529f77ab
Implement jump table, labels in code
2017-12-29 17:08:25 -06:00
Peter Evans
d95572bd4a
Move instruction strings to mos6502.dis.c
2017-12-27 21:21:33 -06:00
Peter Evans
253db81460
Comment out unused instruction string table
2017-12-26 16:45:24 -06:00
Peter Evans
daab8a7f58
Add instruction strings (mapped to enum symbols)
2017-12-11 21:03:16 -06:00
Peter Evans
0336fe7366
Documentation for files
2017-12-08 22:12:31 -06:00
Peter Evans
8cd9c5ffab
Documentation, lacking
2017-12-06 21:25:47 -06:00
Peter Evans
89ddd20658
Add read_byte function to return the next byte in memory
2017-12-05 20:40:35 -06:00
Peter Evans
50a84b4099
Remove cycles field from mos6502 struct
...
It was both unused and not necessary, as we can simply compute the
number of cycles in the execute function.
2017-12-05 20:23:17 -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
eaaf63a069
Zero out last_addr and cycles
...
This fixes a super-annoying bug in the unit-test suite where we would
fail randomly because sometimes last_addr would have garbage in it.
2017-12-05 18:41:34 -06:00
Peter Evans
8454d1a6c9
Add instruction handler function, handler table
2017-12-05 18:38:36 -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
87de0a877a
Add all our tests, plus other fixes
2017-12-03 20:19:17 -06:00
Peter Evans
fe9ce3aca3
Tests for the new mos6502 functions
2017-12-02 13:27:30 -06:00
Peter Evans
3cebed2377
Adding all of the instruction files
2017-12-02 13:05:53 -06:00
