ZiLOG Z80 User Manual page 272

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80
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LOOP:
DONE:
LD 8, 80 ;Set up counter
LD HL, Inbuf ;Set up pointers
LD DE, Outbuf
LID A, (HL) ;Get next byte from
;input buffer
LD (DE), A ;Store in output buffer
CP ODH ;Is it a CR?
JR Z, DONE ;Yes finished
INC HL ;Increment pointers
INC DE
DJNZ LOOP ;Loop back if 80
;bytes have not
;been moved
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