Radio Shack TRS-80 Operation Manual page 105

Computer Graphics
TRS-aO®
Operation Manual
~
~99
YPOS DEFB ~
1~~ OPNFLG DEFB
1
1~1
DCBEE DEFS 5~
1~2
BUFFER DEFS
256
10'3
·
INITG --
Initialize Model III Graphics Board
,
10'4
·
,
'1~5
INITG LD A,l~H
1~6
OUT
(236),A
;Turn on port
1~7
LD BC,15
1~8
LD HL,DATA
1~9
LOOP LD A,B
;Program CRTC chip for
8~
by
24
11~
OUT (136) ,A
I I I LD
A, (HL)
112 OUT (137),A
113 INC HL
114 INC B
115 LD A,B
116 CP C
117 JR NZ,LOOP
118 RET
119 DATA DEFB 99
12~
DEFB
8~
121
DEFB
85
122
DEFB
8
~
123
DEFB
25
124 DEFB 4
125 DEFB 24
126 DEFB 24
127
DEFB ~
128 DEFB 9
129
DEFB ~
13~
DEFB
~
131
DEFB ~
132
DEFB ~
133 DEFB
~
134 DEFB
~
135
·
,
136 END GSAVE
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