36 lines
508 B
NASM
36 lines
508 B
NASM
; Utility commands
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cmd_h: call eat_whitespace
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call eat_hex_word
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jc .err
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mov bx, dx
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call eat_whitespace
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call eat_hex_word
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jc .err
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xchg bx, dx
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push dx
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add dx, bx
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call print16
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call space
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pop dx
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sub dx, bx
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call print16
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jmp crlf
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.err: mov di, eat_hex_word.emsg
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jmp parse_error
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cmd_?: mov si, .txt
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jmp putcs
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.txt: db "G Go", 0x0A, 0x0D
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db "H w w Add and subtract two values", 0x0A, 0x0D
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db "R[r] Print register values", 0x0A, 0x0D
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db "T Single-Step", 0x0A, 0x0D
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db 0
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