; *** REQUIREMENTS *** ; blockdev ; stdio blkBselCmd: .db "bsel", 0b001, 0, 0 ld a, (hl) ; argument supplied cp BLOCKDEV_COUNT jr nc, .error ; if selection >= device count, error call blkSel xor a ret .error: ld a, BLOCKDEV_ERR_OUT_OF_BOUNDS ret blkSeekCmd: .db "seek", 0b001, 0b011, 0b001 ; First, the mode ld a, (hl) inc hl push af ; save mode for later ; HL points to two bytes that contain out address. Seek expects HL ; to directly contain that address. ld a, (hl) ex af, af' inc hl ld a, (hl) ld l, a ex af, af' ld h, a pop af ; bring mode back call blkSeek ld hl, 42 call blkTell ld a, h call printHex ld a, l call printHex call printcrlf xor a ret