Vdt Controller Assembly Configuration - Texas Instruments 990 Manual

Video display terminal
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N
I
-
. .....
JUMPER
P8,P10
1920
CHARACTER
JUMPER P7 ,P11
960 CHARACTER
CAPACITY DUAL
OR SINGLE
(B)136319
C!>7
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CJ
C17
CJ
C24
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U49
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CJ
C27
JUMPER P5
2ND CRT-960
CHAR CAPACITY
JUMPER P6
2ND CRT
1920 CAPACITY
GRAPHICS
ROMS (VDT1)
I
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LOC
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4Q0-7FF
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-- --
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1920
VDT1 MEMORY
2olu2.~I~
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ONLY
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(LSB)
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BIT 0
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GRAPHICS
ROMS (VOTO)
Ul 13
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U45
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C23
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JUMPER P9
GRAPHICS
ENABLE
CJ
U47
C20
Figure 2-5. VDT Controller Assembly Configuration
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U128
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U132
BIT 7
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LOC 400-7FF
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REFRESH MEMORY VOTO
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