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Safiire 2015-02-18 18:40:00 -08:00
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# assembler6502 # assembler6502
An assembler for the 6502 microprocessor written in Ruby An NES assembler for the 6502 microprocessor written in Ruby
6502 Assembler
Usage: ./assembler\_6502.rb <infile.asm> -o outfile.nes Usage: ./assembler\_6502.rb <infile.asm> -o outfile.nes
@ -20,20 +18,21 @@ An assembler for the 6502 microprocessor written in Ruby
where labels were used. where labels were used.
I have used this to compile some code for the NES, and it ran correctly I have used this to compile some code for the NES, and it ran correctly
on FCEUX, got it to make some sounds, etc. on FCEUX, got it to make some sounds, load tiles, sprites, and scrolling.
Some Todos: Some Todos:
- I need to add the #\<$800 and #\>$800 style operators to select the
MSB and LSB of immediate values during assembly.
- I may make this into a Rubygem - I may make this into a Rubygem
- Maybe I can put some better error messages. - Maybe I can put some better error messages.
- I should just make a 6502 CPU emulator probably now too. - Should I also make a 6502 Emulator in Ruby?
Some new additions: Some new additions:
- Ported NES101 tutor to this assembler.
- Added msb and lsb byte selectors on address labels
- added .org directive - added .org directive
- added .dw directive - added .dw directive
- added .bytes directive - added .bytes directive
- added .incbin directive - added .incbin directive
- added .ascii directive
- Invented my own iNES header directive that is JSON - Invented my own iNES header directive that is JSON
- Split the project up into separate files per class - Split the project up into separate files per class
- Wrote some more unit tests - Wrote some more unit tests
@ -47,6 +46,3 @@ their correct places, and then after resolving symbols during the second pass,
I just clip out the Cartridge ROM area and iNES header at the end, works great I just clip out the Cartridge ROM area and iNES header at the end, works great
so far. so far.
Next up I will port some more tutorials that use sprites and use controller input
and sound all together.