Texas Instruments 990 - Page 35

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MODE KEYS
KEYBOARD
(01136250
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1
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I HORIZONTAL
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DEFLECTION
COILS
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r
BUFFER
REGISTER
REPEAT
LOGiC
VERTICAL
DEFLECTION
AMPLIFIER
CRT MONITOR
+1 s voe
-12 voe
+5 voe
L-------
VIDEO
DUAL-
GAIN
AMPLIFIER
H-SYNC
LOGIC
VERT. SYNC
V-SYNC
LOGIC
UART
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STATIJS
LOGIC
11-BIT SERIAL DATA
LED DISPLAY
AUDIO
AMPLIFIER
3.3 vocl
TERMINAL READY
11-BIT SERIAL DATA
AUDIO
OSCILLATOR
I
I
I
MODEM AUDIO
+15 voe
SUPPLY
-12 voe
SUPPLY
+5 voe
SUPPLY
POWER/LOGIC PWB
-------
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L-------~-
DISPLAY ASSEMBLY CABINET
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r-------------------------,
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COMPOSITE VIDEO
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DISPLAY
UNIT
INTERFACE
LOGIC
ALARM
LOGIC
SELF-TEST
LOGIC
TIME BASE
GENERATOR
L~--------------
VIDEO
OUTPUT
LOGIC
CRU
~T"=~~~~ l4-- .... IN1_~~~CE -.-~,;;.:.;,;,,.;;;,;;;~~---
LOGIC
VDT CONTROLLER
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Figure 1-16. Model 911 VDT Detailed Block Diagram
TO/FROM
COMPUTER
1-25/1-26
Digital Systems Division