chASM

Chip-8 Assembly Language in JavaScript

what is chASM ?

chASM is a simple toy assembly language designed to quickly make games for the chip-8. its syntax is very minimalistic and contains some of the minor q.o.l features many assembly languages have.

features

chASM has a few simple features:

Feature	Description	Syntax
Labels	Used for program structure	label:
Defines	Used for common values	.define funnynum 69
Data Sections	Used to insert raw data	.data 0x80 0xff

usage

chASM is not meant to be taken as a professional programming language; it is a toy language designed to swiftly make small programs.

here is an example program that draws a random maze:

    .define size 4
  
maze:
# pick random maze piece
    rnd 2 1
# assign i to maze piece depending on v 2 (random number)
    seq_xkk 2 1
    jmp pickleft
    ldi r

drawandadvance:
    draw 0 1 size
    add_xkk 0 size
# check if at the wall
    sne_xkk 0 64
    call resetxy
# start again
    jmp maze    

pickleft:
    ldi l
    jmp drawandadvance

resetxy:
    ld_xkk 0 0
    add_xkk 1 size
    call checkatend
    ret

checkatend:
    sne_xkk 1 32
    jmp forever
    ret

forever:
    jmp forever
  
# maze sprites
l:
    .data 0x80 0x40 0x20 0x10
r:
    .data 0x10 0x20 0x40 0x80

conclusion

well, thats all there is to chASM, have fun !