IBM Personal System/2 65 SX User Manual

System-Board Memory Connectors
The system board has two 72-pin memory connectors that support
1MB, 2MB, and 4MB memory cards. The following table shows the
pin assignments for the connectors.
Pin vo Signal Pin 0 Signal
1 N/A Ground 37 /O Parity Data 1
2 VO Data 0 38 Vo Parity Data 1
3 VO Data 0 39 N/A Ground
4 VO Data 1 40 oO CAS 0
5 0 Data 1 41 oO CAS 2
6 0 Data 2 42 3° CAS 3
7 0 Data 2 4 °O CAS 1
8 0 Data 3 44 0 RAS 0
9 0 Data 3 45 Oo RAS 1
10 oO +5 Vdc 46 3 Block Select 1
11 QO -CAS Parity 47 oO Write Enable
12 oO Address 0 48 N/A Reserved
13 °O Address 1 49 vO Data 8
14 oO Address 2 50 V0 Data 8
15 QO Address 3 51 VO Data 9
16 O Address 4 52 Vo Data 9
17 Oo Address 5 53 0 Data 10
18 oO Address 6 54 1/0 Data 10
19 N/A Reserved 55 VO Data 11
20 VO Data 4 56 0 Data 11
21 VO Data 4 57 0 Data 12
22 1/0 Data 5 58 VO Data 12
23 VO Data 5 59 Oo +5 Vdc
24 0 Data 6 60 VO Data 13
25 1/0 Data 6 61 0 Data 13
26 vo Data 7 62 vO Data 14
27 0 Data 7 63 1/0 Data 14
28 ° Address 7 64 VO Data 15
29 oO Block Select 0 65 vO Data 15
30 QO +5 Vde 66 oO Block Select 2
31 0 Address 8 67 I Presence Detect 0
32 oO Address 9 68 | Presence Detect 1
33 oO RAS 3 69 | Presence Detect 2
34 oO RAS 2 70 | Presence Detect 3
35 vO Parity Data 0 71 ° Block Select 3
36 1/0 Parity Data 0 72 N/A Ground
RAS = Row Address Strobe
CAS = Column Address Strobe
Figure 3-6. System-Board Memory Connectors
Model 65 System Board — October 1990 3-11

IBM Personal System/2 65 SX Specifications

General

Brand	IBM
Model	Personal System/2 65 SX
Category	Desktop
Language	English