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ZeD ASSEMBLER
88-7201
PAGE 01
01 0000
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18 0000
F5
19 0001 3EOO
CD1600
Fl
D3FF
20
21
22
0003
0006
0007
23 0009
24
OOOB
25
OOOD
26
OOOF
27 0012
28 0013
3E80
D3FE
3EOl
CD1600
AF
D3FE
29 0015 C9
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0016
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0016
38 001b
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0016
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0018
45 001 E
46
0020
47 0022
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0025
50 0026
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010000
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E60D
BA
200:3
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51
0027
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52
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53
0029 7B
54 002A 81
55 002B 20F1
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0020 10
57
002E 20EE
58 0030 01
59 0031 Cl
60 00:32 C:30000
61 0035
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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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