IBM 5150 Hardware Reference Manual

General specifications for memory used on both cards are:
Access - 250
ns
Cycle - 410 ns
Memory Module Description
Each option contains 18 dynamic memory modules. The 32KB
Memory Expansion Option utilizes 16K x 1 bit modules and the
64KB Memory Expansion Options utilizes
32K x 1 bit modules.
Both memory modules require three voltage levels (+5Vdc, -5Vdc,
+ 12V dc) and 128 refresh cycles every 2 msec. Absolute maximum
access times are:
From RAS: 250 ns
From CAS: 165
ns
Table 19. Memory Module Pin Configuration
PIN 16K X 1 BIT MODULE
NO.
(Used on 32KB Card)
1
-
5V
2
Data In **
3 - Write
4
- RAS
5
AO
6
A2
7 Al
8
+12V
9
+ 5V
10 A5
11
A4
12
A3
13
A6
14
Data Out **
15
- CAS
16
GND
17
-
*
18 -
*
32K X 1 BIT MODULE
(Used on 64KB Card)
- 5V
Data In **
- Write
- RAS 0
-
RAS 1
AO
A2
A1
+12V
+ 5V
A5
A4
A3
A6
Data Out **
- CAS 1
-
CASO
GND
* 16K X 1 bit m.odule has only 16 pins.
** Data In and Data Out are tied together (three state bus).
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IBM 5150 Specifications

General

Brand	IBM
Model	5150
Category	Desktop
Language	English