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Sharp MZ-80P4 Instruction Manual page 33

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•
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ZeD ASSEMBLER
88-7201
PAGE 01
01 0000
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19 0001 3EOO
CD1600
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20
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23 0009
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25
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26
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27 0012
28 0013
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29 0015 C9
30 0016
31 0016
32 0016
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35 0016
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38 001b
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45 001 E
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54 002A 81
55 002B 20F1
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PRINTER MZ-80P4 CONTROL SUBROUTINE
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PORT
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FEH
PORTIO: EQU
FFH
, JP ABNML:NO POWER,NO PAPER,DISELECT OR MECHANICAL TROUBLE
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DATA CODE TRANSFER SUBROUTINE
, BEFORE CALL "PRINT",SET TRANSFERED PRINT CODE IN ACC
: ALL REGISTOR RESERVED ON NORMAL RETURN
~
; ; ; ; ; ;: ;: i i ; i ;: i
j
i i i ; ;
j
i
j j j j
j
j
i
j j
i
j ; ;
l ; ;
i i ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
PRINT:
ENT
PUSH
LD
CALL
POP
OUT
LD
OUT
LD
CALL
XOR
(JUT
RET
AF
A,OOH
BUSY/C
AF
(PORTIO) ,A
A,80H
(PORTI!) ,A
A,OIH
BIJSY/C
A
(PORT/I)
,A
lBUSY SIGNAL IS LOW'
,DATA TRANSFER
,IT MAKES DATA STB HIGH
lBUSY SIGNAL IS HIGH'
lIT MAKES DATA STa LOW
.......................................................
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BUSY SIGNAL CHECK SUBROUTINE
ONLY ACC. IS BROKEN ON NORMAL RETURN
RESURVED EXCEPT ACCUMULATION (A)
BEFORE CALL "BU8Y/C",SET FOLLOWING CODE IN ACC.
A'O:CHECKS IF BUSY IS LOW LEVEL
A·l:CHECKS IF BUSY IS HIGH LEVEL
;; ; ; i ;; ; ;;
i ;
j ; ; ; ; ; ; ; ; ; ; ;
j ; ; j ; ; ; ; ;
j ;
j:j ; j j ; ; j:j ; ; ; ; ; ; ; ; ; ; ;
BUSY
le:
PU:3H
PUSH
LO
LD
LD
LOOP:
IN
AND
CP
.JR
POP
POP
RET
DEC
LD
OR
JR
DEC
JR
POP
POP
,JP
END
BC
DE
D,A
E,QCH
BC,OOOOH
A,
(PORT I! )
(IDH
D
NZ,+5
DE
BC
BC
A,B
c
NZ,LOOP
E
NZ,LOOF'
DE
BC
ABNML
30
,FOR TIME DELAY
;CHECKS BUSY SIGNAL
,REPEAT
lNORMAL RETURN
lPRINTER IS NOT ON LINE

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