Texas Instruments 990 - PowerLogic PWB

CRT
L..
MONITOR
-
+
KEYBOARD
-•
...
POWER/LOGIC PWB
--
(B) 1 36264
L..
-
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
L
---------
L.._
....
DISPLAY
_..
UNIT
__..
i...
..
INTERFACE
.......
~
LOGIC
SELF-TEST
LOGIC
..
...
......
...
••
•
•
...
,..
ALARM
.....
....
LOGIC
~
...
TIME BASE
GENERATOR
---------
VIDEO
i...
OUTPUT
-
LOGIC
•
•
REFRESH
MEMORY
~
~~
ill..
L..
I""
....
....
CRU
1~
INTERFACE
-
..
LOGIC
.....
......
KEYBOARD
....
.....
......
INTERFACE
~
...
.....
LOGIC
I""
..
......
_..
..
I
I
I
I
I
I
I
I
I
I
I
1
-.
I
l
I
-.
_l
I
SERIAL DATA
SERIAL DATA
CRU ADDRESS
MODULE SELECT
STORE CLOCK
CRU RESET
VOTO INTERRUPT
I VDT1
INTERRUPT
I
I
I
I
--
....
_..
.......
..
......
TO/FROM
COMPUTER
--------------------.....--
I
_J
Figure 1-2. Model 911 VDT Block Diagram
1-3/1-4
Digital Systems Division