Radio Shack CCR-81 Operation Manual

Computer Graphics
Operation Manual
TRS-BO®
i~
~l1l1fn
GPRT2 -- Print
graphics
X horizontal
~1111112
~1111113 PSECT ~F~l1l1H
111111114
GPRT2
PUSH
HL
111111115
PUSH
DE
~1111116
PUSH
BC
~1111117
PUSH
IX
111111118
CALL INITG
111111119
LD
HL,BGMODE
iTurn on graphics print mode
~1111111
LD B,l
11111111
LD
C ,,0DH
11111112
CALL
PRLINE
~111113
LD c,,0
iGraphics Y address
11111114
LD A,,0E3H
11111115
OUT
(STATUS) ,A
11111116
.
,
~111117
NEWLN PUSH
BC
11111118
LD HL,BUF
iClear buffer
11111119
LD DE, BUF+l
11~11211
LD BC,639
11111121
LD A,811H
~111122
LD
(HL) ,A
11111123
LDIR
"~,
11111124
i
~111125
POP
BC
11~1126
LD D,l
iBit in
buf to set
11111127
i
~111128
NEWRW
LD
A,C
11111129
OUT
(Y) ,A
iUpdate
Y address
111111311
INC
C
11111131
LD
HL,BUF
~111132
XOR A
~111133
OUT
(X) ,A
iRestart X address
11111134
LD
B,811
iGet 811 graphics bytes
11111135
.
,
11111136
BYTE
PUSH
BC iSave Y & loop
counter
11111137
IN
A, (GRAPH)
~111138
LD C,A
iSave graphics
byte in C
~111139
LD
E,811H iGet bits left
to right
1111114~
BIT
LD A,C
11111141
AND E
11111142
JR
Z,OFFI
11111143
LD
A,D
~111144
OR
(HL)
11111145
LD
(HL) ,A
iSet bit in buffer
11111146
OFFI
INC HL iNext buffer byte
11111147
SRL E
iNext bit
----------Itadlelllaeli ---------
-83-

Radio Shack CCR-81 Specifications

General

Brand	Radio Shack
Model	CCR-81
Category	Desktop
Language	English