Texas Instruments 990 - Page 31

~
945424-9701
~
/..,0
0
0
2
3
4
5 6
7 8
9
to
C
r -,--T--r--,--,--,--T--r-n
I LSB I I I I I I I MSB IPARITYI STOP
__ ...J __ i_ __ L_...J __ J __ J __ i__-L_...J
A)136261
Figure 1-13. Model 911 VDT Power/Logic PWB-to-VDT Controller Data Format
DISPLAY UNIT HOUS l~JG
INTERCONNECTION CABLE
POWER/LOGIC \
PWB J
(
GND
< J4-1
J2-1
,t
JS-1
J2-2
(
I \
CVID/VIV
< J4-2
JS-2
'
..... '
<
BET1T
< J4-7
J2-7
VOTO
JS-7
JZ-8
(
BET2T
< J4-8
JS-8
<
I
MODIN
( J4-9
J2-9
JS-9
I
)
)
\
VDT1
(A)136262
Figure 1-14. Model 911 VDT Controller-to-Power/Logic PWB Interface
1.3.4.1 Video (CVID/VlV and GND). Video (VlV) carries the composite video signal from the
VDT controller to the power/logic pwb for separation into its components (video data, hori-
zontal sync, and vertical sync) for the CRT monitor. CVID is the power/logic pwb mnemonic for
the composite video signal. CVID travels on the center conductor of a coaxial cable, and GND is
the grounded shield.
1-21
Digital Systems Division