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System Board Memory Connector
The system board has four 30-pin connectors and comes with four
256KB memory module packages installed. The following figure
shows the pin assignments and signal definitions for these
connectors.
Pin
110
Signal
Pin
1/0
Signal
1
N/A
+ 5Vdc
2
I
-Column Address Strobe
3
1/0
Data BH 1
4
I
Address BH 1
5
I
Address BH 2
6
1/0
Data Bit 2
7
I
Address BH 3
8
I
Address BH4
9
N/A
Ground
10
1/0
Data BH3
11
I
Address BH 5
12
I
Address BH6
13
1/0
Data BH4
14
I
Address BH7
15
I
Address BH 8
16
1/0
Data Bit 5
17
I
Address BH 9
18
N/A
No Connection
19
I
Reserved
20
1/0
Data Bit 6
21
I
-WrHe Strobe
22
N/A
Ground
23
1/0
Data Bit 7
24
0
Presence Detect
25
1/0
Data BH8
26
0
Presence Detect
27
I
Reserved
28
N/A
No Connection
29
1/0
Data Bit 9 (Parity)
30
N/A
+5Vdc
Figure
3-5. System Board Memory Connector
Model 60 System Board
3-9
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