David Buchanan
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64df2291fc
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Static-ify instruction arrays
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2020-12-11 16:18:42 +00:00 |
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Rob McMullen
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4303c7276d
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Marked read_addr & write_addr as extern in 6502.h
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2018-05-17 13:49:33 -07:00 |
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Rob McMullen
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b664db7406
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Changed header to define external vars to prevent multiple symbol definitions if included in multiple C files
* space is reserved for the variables in 6502.c
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2018-05-17 09:51:33 -07:00 |
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Rob McMullen
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60a354d64c
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Removed commented out DEBUG define since it's not used anywhere
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2017-12-19 18:36:34 -08:00 |
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Rob McMullen
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20d6e48c9f
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Added decimal mode for ADC and SBC
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2017-12-19 17:25:35 -08:00 |
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Rob McMullen
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138531960f
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Added -l command line argument to specify load address
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2017-12-19 11:44:17 -08:00 |
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Rob McMullen
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2ae87bf12e
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Fixed cycle timing for multi-byte NOP instructions
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2017-12-19 09:20:27 -08:00 |
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Rob McMullen
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454e33269a
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Fixed STA; it's the only operation that doesn't have extra cycles for crossing page boundaries
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2017-12-19 09:20:27 -08:00 |
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Rob McMullen
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75bb592753
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Added extra cycles when crossing page boundaries and for branches taken
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2017-12-19 09:18:36 -08:00 |
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Rob McMullen
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b6542017bd
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Updated instruction cycle timing for each opcode
* Opcode timings are without page crossing or branch taken extra cycles
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2017-12-18 21:19:51 -08:00 |
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Rob McMullen
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d4f85001dc
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Added multi-byte NOP instructions
* fixes line #5010: C6C7 08 PHP
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2017-12-18 12:19:59 -08:00 |
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Rob McMullen
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15287322f1
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Handle zero page wraparound in ($xx),Y
* fixes line #3065: D95B C9 12 CMP
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2017-12-18 12:01:18 -08:00 |
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Rob McMullen
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986a9f33b6
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Handle zero page wraparound in ($xx,X)
* fixes line #1100: CFF4 C9 5D CMP
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2017-12-18 11:58:03 -08:00 |
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Rob McMullen
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44dfdfaca5
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Handle JMP ($xxFF) bug
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2017-12-18 11:27:17 -08:00 |
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Rob McMullen
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145de40872
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Fixed PLP to always clear B flag
* line #103: C826 D0 09 BNE
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2017-12-18 10:37:23 -08:00 |
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Rob McMullen
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3471e9aa3a
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Fixed PHP to only modify B flag in byte written, status reg itself is unchanged
* line #71: C7E8 68 PLA
* see http://visual6502.org/wiki/index.php?title=6502_BRK_and_B_bit
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2017-12-18 10:11:25 -08:00 |
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Rob McMullen
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4bfc5655b6
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Removed DECIMAL message to allow comparisons to NES log
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2017-12-18 09:52:50 -08:00 |
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Rob McMullen
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c5e9cf084e
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Added command line args to set initial machine state
* changed debug print to match a validation run found on nesdev.com
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2017-12-18 09:15:02 -08:00 |
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DavidBuchanan314
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622a2dda85
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Add framework for cycle counting
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2017-01-08 16:28:32 +00:00 |
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DavidBuchanan314
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04e228bfef
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Fixed memory wrapping in address-mode decoders
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2017-01-03 21:51:21 +00:00 |
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DavidBuchanan314
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1da995b11a
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Made variable names slightly more consistent
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2017-01-03 20:19:58 +00:00 |
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DavidBuchanan314
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378169d56b
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Initial commit
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2017-01-03 19:39:48 +00:00 |
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