Tektronix PS 5010 - Page 216

I
FIRMWARE SIGNATURE ANALYSIS -
+ 5 V Signature = 0001
KEYBOARD ENCODER (U1421) (Cont.)
DO, Dl X Y
Key Name
02 (Pulse) (Low) 03 D4 D5 D6 07
INST ID
ENTER
CLEAR
3
6
9
8
5
2
0
1
4
7
INCREMENT 4
SUPPLY SELECT
CURRENT
VOLTAGE
INCREMENT
+
OUTPUT
Make data measurements
on R1211
1-I-3-4-5-6-7-8
DDDDDDDD
01234567
Pinouts for U 142 1
2
q .c
Buffered data bits 2- '
2@-
A*oh.,4#o
*QQooo I 'c
''~~~~~~
CPU board
Fig. 9-7.
REV DEC 1982