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22 Commits 4 Branches 1 Tag 199 KiB
8f10724a7f
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22 Commits

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Author SHA1 Message Date
James Tauber
8f10724a7f fixed inverse use of carry in SBC 2011-08-06 23:53:47 -04:00
James Tauber
6e709fcc4c turns out PLA DOES affect NZ after all 2011-08-06 23:36:04 -04:00
James Tauber
b413e9ac64 renamed load to load_file, added a load to load memory from byte list and refactored loading code 2011-08-06 23:11:52 -04:00
James Tauber
309f8277e1 emulate indirect mode bug in 6502 2011-08-06 23:02:52 -04:00
James Tauber
84bdef67cd reimplemented CMP, CPX and CPY based on 2006/2007 code 2011-08-06 22:39:11 -04:00
James Tauber
6fb2d79cda reimplemented ADC and SBC based on 2006/2007 code 2011-08-06 22:35:45 -04:00
James Tauber
32120dffef apparently PLA does not affect NZ flags 2011-08-06 22:12:11 -04:00
James Tauber
3a20c009d9 little BIT of simplication 2011-08-06 22:05:15 -04:00
James Tauber
c6a6071b2c cleaned up ASL implementation 2011-08-06 21:50:01 -04:00
James Tauber
687b2e345f TSX updated NZ flags 2011-08-06 21:41:52 -04:00
James Tauber
294d9b027a fixed stray comment 2011-08-06 21:31:25 -04:00
James Tauber
ebca76c29b factored out stack pull/push 2011-08-06 21:30:58 -04:00
James Tauber
d6875b2419 refactored flags to status byte and back 2011-08-06 21:12:02 -04:00
James Tauber
20457db088 slight refactor of update_nz and update_nzc 2011-08-06 21:05:22 -04:00
James Tauber
accc0a60bd implemented BRK and RTI 2011-08-06 21:00:50 -04:00
James Tauber
807f392386 make further use of addressing mode refactor 2011-08-06 18:13:56 -04:00
James Tauber
28fcca6bde added zero_page_y_mode 2011-08-06 18:09:37 -04:00
James Tauber
3344005fe7 added wrap-around for zero_page_x_mode 2011-08-06 18:08:39 -04:00
James Tauber
fef234f7c0 refactored addressing mode code 2011-08-06 18:07:50 -04:00
James Tauber
a48716a900 added if __name__ == "__main__" test for mainline 2011-08-06 17:46:38 -04:00
James Tauber
55d700fc68 simplified screen address to col/row translation based on code from 2006 2011-08-06 17:43:59 -04:00
James Tauber
80f221b0f5 initial update from 2001 code 2011-08-06 16:55:33 -04:00