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795ccfde5d
Bug Fixes: - Fixed several bugs in the CPU that caused processor status flags to be set incorrectly. Instructions affected were: STA, STX, STY, CMP, CPX, CPY, BIT. - Made some internal-use-only methods on the CPU class private. - Fixed incorrect disassembly of (Indirect,X) and (Indirect),Y instructions. Although this didn't affect behavior, it certainly caused me some confusion in debugging. - Added missing "BCS" instruction to instruction table. Enhancements: - Now includes a full version of Lee Davison's Enhanced 6502 BASIC bundled as source code and a ROM image. Get that REAL COMPUTER EXPERIENCE!(tm) - If a file named "rom.bin" exists in the same directory where the simulator is executed, it will be loaded at addresses $d000-$ffff. - Gave the CPU an idle loop to make simulated timing a little more realistic (but this is still an area needing major improvement) - Changed the CPU's toString() method to give better debugging output. - Added a small typeahead buffer to the Console. - Better exception messaging. Misc: - Bumped version to 0.5, updated README.
40 lines
1.0 KiB
Plaintext
40 lines
1.0 KiB
Plaintext
Sample Programs
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1. hello.prg
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When loaded at address $0300, this program will print "Hello, 6502 World!" in
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infinite loop.
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2. echo.prg
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When loaded at address $0300, this program will echo back to the console
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anything typed.
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Both hello.prg and echo.prg were assembled with the Ophis assembler:
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https://hkn.eecs.berkeley.edu/~mcmartin/ophis/
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3. ehbasic.rom
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This is Lee Davison's Enhanced 6502 BASIC.
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To use this ROM image, just copy the file 'ehbasic.rom' into the directory
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where you run Symon. Rename the file to 'rom.bin'. When you start Symon,
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the ROM file will be automatically loaded at address $d000.
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Click the "Run" button and EhBASIC should automatically start running.
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Type 'C' to do a cold start.
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Then, type $C000 when prompted for the memory size.
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NOTE: EhBASIC only wants upper-case input. This confused me at first!
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More information can be found in the 'ehbasic' directory, and by visiting
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the EhBASIC web page:
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http://mycorner.no-ip.org/6502/ehbasic/index.html
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