HP 8112A Operating, Programming And Servicing Manual page 348

A3 M I C R O P R O C E S S O R B O A R D 081 1 6- 6 6 5 2 3
'fl
a:
J1
FROM
U 3 0
B-14 Backdating
2. Figure B-2 shows the location of the RAMs UlO and U l l on the
microprocessor board 081 16-65503. Modify Chapter 10.7, Figure
10.7-9 accordingly.
TPl +5V
• •
U5
Figure B-2. 08 1 16-66523: U 1 0, U 1 1 layout
3. Figure B-3 shows the RAM circuit on the microprocessor board
081 16-65523. Modify Chapter 10.7, Figure 10.7-5 accordingly.
TO U 2 9 B / 8
-
R / W
Alil
A l
A 2
A 3
A4
A5
A6
A 7
A B
A9
0 7 1 1
06 1 2
0 5 1 3
0 4 1 4
-
U 30/5 R/W
A D D R E S S B U S _..
D A T A BUS
Figure B-3. 08 1 1 6-66523: U 1 0, U 1 1 schematic
SA SP TP3
• • •
U8
TO U2B/ l
l B
VCC
CS
-
1 0 R/W
G 2
5
1
6
2 (")
N
7
&
4
4
-
B
I
3
&
1 6
<(
2
32
1
64
1 7
1 2B
1 6
256
1 5
U l l
5 1 2
RAM
[> 1
2
<J
[> 1
<J 2
[> 1
<J 2
[> 1
<J 2
TP2 TP1
•
•
TO U2B/ 1
1 0
G2
A0 5
1
A l 6
2 (")
N
A2 7
4
&
4
A3
-
B
I
A4 3
&
1 6
<(
A 5 2
32
A6 1
64
1 7
A 7
1 2B
1 6
A B
256
A9 1 5
U 1 0
5 1 2
R A M
03 1 1
[> 1
2
<J
02 1 2 [> 1
<J 2
0 1 1 3
[> 1
2
<J
Olil 1 4
[> 1
2
<J