; comments are ignored
; This is a very simple test file for an assemblier.
.db msg "Hello, world!"

copy r1, msg
copy r2, 0
.loop:
    cmp r1, 0
    jz .loop
    add r1, 1
mov r1, 5   ; move the immediate value 5 into r1
add r1,5   ; add 5 into r1
int 21      ; maybe that will call some string drawing BIOS-like routine
ret
; form  YYYY YYXX - Y opcode, X modifier
; nop:  0000 0000
; copy: 0000 01XX
; add:  0000 10XX - | Perhaps running these will clear any overflow
; addc: 0000 11XX - | or under flow flags if no errors occur.
; sub:  0001 00XX - | jz should clear the zero flag.
; subb: 0001 01XX - |
; call: 0001 1100 - Always call [imm16]
; jmp:  0010 0000 - Always jmp [imm16] (No short jumps)
; jz:   0010 0100 - Always jz [imm16] (no short jumps)
; cmp:  0010 11XX
; push: 0011 11XX -| pop / push imm16/imm8 | reg
; pop:  0100 00XX -|

; 
; imm8 imm16 reg
; mov reg, imm16|reg
; add reg, imm16|reg
; int imm16
; db [label] 'String data here' (Null byte is added implicatly by the assemblier)
; 
; enum Type {
;   Op,
;   Reg,
;   Imm16,
;   Imm8
; }
; struct Token {
;   enum Type type;
;   char *value;
; }