Radio Shack CCR-81 Operation Manual

computer Graphics
Operation Manual
TRS-BO®
r--
JJ99
POP
HL
1~~
XOR
A
1~1 RET
1~2
X
EQU
80'H
1~3
y
EQU 81H
1~4
GRAPH
EQU
82H
1~5
STATUS
EQU 83H
1~6 MASK DEFB
80'H iMask to use in extracting bits
1~7
BGMODE
DEFB 12H
iControl
byte:
start graphics mode
1~8
BUFFER
DEFS
24~ iPrinter data buffer
10'9
EGMODE
DEFB lEH
iControl byte:
end graphics mode
110'
BPOS DEFB
0'
iBit position in printer buffer
III
XLOC DEFB
0'
iCurrent X location value
112
i
113
i
114
.
INITG --
Initialize
Model III Graphics Board
,
115
.
,
116
INITG
LD A,l~H
117
OUT
(236) ,A
iTurn on
port
118
LD
BC,15
119
LD
HL,DATA
12~
LOOP
LD A,B
iProgram
CRTC
chip for 80' by 24
121
OUT
(136),A
122
LD
A, (HL)
123
OUT
(137) ,A
,,---"
124
INC
HL
125
INC B
126
LD
A,B
127
CP
C
128
JR NZ,LOOP
129
RET
13~
DATA
DEFB
99
131 DEFB
8~
132
DEFB
85
132 DEFB
8
133
DEFB
25
134 DEFB
4
135
DEFB
24
136 DEFB
24
137
DEFB
JJ
138
DEFB 9
139
DEFB
~
14JJ
DEFB
0'
141
DEFB
0'
142
DEFB
0'
143
DEFB
0'
144
DEFB
0'
145
146
END
GPRINT
,~
Itadlelllaell
-81-

Radio Shack CCR-81 Specifications

General

Brand	Radio Shack
Model	CCR-81
Category	Desktop
Language	English