Memotech Limited MTX 500 Specifications download pdf (Page 85)

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INBIT1: JR NC,INBIT 1

INBIT2: DEC A

JP C,INBIT2 ;A bit faster

CP (IX+0) ;IX = MIDVAL

RET

;

OUTBIT::

CALL BLIP ;Preserves carry flag

LD A,0 ;Preserves carry flag

JR C,HIGH

;

;Both LOW and HIGH entered with A = 0

;

LOW:: JR NC,LOW

OUT (CASPORT),A

L0W1: JR C,LOW1

INC A

OUT (CASPORT),A

RET

;

HIGH:: JR C,HIGH

HIGH1: JR NC,HIGH1

OUT (CASPORT),A

HIGH2: JR C,HIGH2

HIGH3: JR NC,HIGH3

INC A

OUT (CASPORT),A

RET

;

INBYTE:: LD B,B

INBY1: CALL INBIT

RR C

DJNZ INBY1

RET

;

OUTBYTE:: LD B,B

OUTBY1: RR C

CALL OUTBIT

DJNZ OUTBY1

RET

;

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Memotech Limited MTX 500 Specifications Page 85

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