IBM Personal System/2 50 - System Board Memory Connector

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 0 Signal Pin vo Signal
1 N/A § Vde 2 | -Column Address
Strobe
3 0 Data Bit 1 4 I Address Bit 1
5 ! Address Bit 2 6 VO Data Bit 2
7 I Address Bit 3 8 t Address Bit 4
9 N/A Ground 10 vo Data Bit 3
11 | Address Bit 5 12 I Address Bit 6
13 VO Data Bit 4 14 ! Address Bit 7
15 ! Address Bit 8 16 VO Data Bit 5
17 ! Address Bit 9 18 N/A No Connection
19 l Row Address Strobe 1 20 Vo Data Bit 6
21 t -Write Strobe 22 N/A Ground
23 /0 Data Bit 7 24 oO Presence Detect
25 /0 Data Bit 8 26 Oo Presence Detect
27 { Row Address Strobe 28 N/A No Connection
29 vO Data Bit 9 (Parity) 30 N/A +5 Vdc
Figure 3-5. System Board Memory Connector, Type 17
Model 50 System Board — October 1990 3-9