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System Board Memory Connector
The Type 1 and 2 system boards use different types of memory
connectors. The Type 1 system board has two 30-pin connectors and
comes with two 512KB memory module packages installed. The Type
2 system board has one 72-pin connector and comes with one 1MB
memory module package installed. The following figures show the
pin assignments and signal definitions for these connectors.
Pin
110
Signal
Pin
110
Signal
1
N/A
5Vdc
2
I
-Column Address Strobe
3
1/0
Data Bit 1
4
I
Address Bit 1
5
I
Address Bit 2
6
1/0
Data Bit 2
7
I
Address Bit 3
8
I
Address Bit 4
9
N/A
Ground
10
1/0
Data Bit 3
11
I
Address Bit 5
12
I
Address Bit 6
13
1/0
Data Bit 4
14
I
Address Bit 7
15
I
Address Bit 8
16
1/0
Data Bit 5
17
I
Address Bit 9
18
N/A
No Connection
19
I
Row Address
20
1/0
Data Bit 6
Strobe 1
21
I
-Write Strobe
22
N/A
Ground
23
1/0
Data Bit 7
24
0
Presence Detect
25
1/0
Data Bit 8
26
0
Presence Detect
27
I
Row Address Strobe
28
N/A
No Connection
29
1/0
Data Bit 9 (Parity)
30
N/A
+5Vdc
Figure
3-5. System Board Memory Connector, Type 1
Model 50 System Board
3-9
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