40 Commits

Author	SHA1	Message	Date
James Tauber	02714dff55	if writing to text screen row group 3 just skip instead of throwing exception	2011-08-07 07:03:50 -04:00
James Tauber	6525a27511	don't treat indices as signed in indexed addressing modes (ht: ghewgill)	2011-08-07 06:42:47 -04:00
James Tauber	4177ae0b25	consistent whitespace	2011-08-07 06:29:15 -04:00
James Tauber	772cdad470	Merge pull request #4 from ghewgill/master ... add disassembler	2011-08-07 03:22:40 -07:00
James Tauber	c42c5044fc	split memory handling into separate classes for RAM, ROM and Soft Switches	2011-08-07 06:19:49 -04:00
Greg Hewgill	267d0c8e06	add disassembler, enable for dump mode	2011-08-07 21:52:26 +12:00
Greg Hewgill	56e82f7cb6	don't allow writes to ROM area (this caused the ][+ ROM to hang on boot)	2011-08-07 21:31:01 +12:00
Greg Hewgill	c9dcee2f08	fix typos for zero_page_y_mode in instruction dispatch table	2011-08-07 20:30:44 +12:00
Greg Hewgill	1925846c3c	fix dump() function so it works (when uncommented)	2011-08-07 19:32:39 +12:00
Greg Hewgill	dde4a83f85	fix typo in instruction table	2011-08-07 19:10:30 +12:00
Greg Hewgill	e961d7e00d	simplify calculating signed values in adc and sbc	2011-08-07 18:33:42 +12:00
Greg Hewgill	5a8b25b771	only need to allocate 64k of memory	2011-08-07 18:17:24 +12:00
James Tauber	ce179a470f	if curses can't write a character to the screen, just skip it; fixes #1	2011-08-07 01:34:10 -04:00
James Tauber	44099ae4f2	improved implementation of indirect bug across page boundaries including indexed indirects as well	2011-08-07 01:22:48 -04:00
James Tauber	c101868549	fixed error in BVS	2011-08-07 00:39:17 -04:00
James Tauber	36355def33	whitespace nit	2011-08-07 00:37:49 -04:00
James Tauber	f521fba883	properly use 0 and 1 not False and True for flags	2011-08-07 00:30:12 -04:00
James Tauber	777266f8e1	implemented non-accumulator version of ROR	2011-08-07 00:24:25 -04:00
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