IBM 5150 Hardware Reference Manual

Keyboard Interface B lock Diagram
74S74
74LS322
PAO
QH
QH
0
PAl
OG
0
IRQ]
r"\ PA2
OF
CLOCK
PA3
OE
~
-CLR
-0
1'--
PM
00
+5V-O
-PR
PAS
OC
PA6 OB
PA7
OA
PB7
-OE
LSl25
L
¢ +5V
-CLR
4.1K OHM
-6
KEYBOARD
+5V -
DO
DRV
DATA
-SE
GND-
0
OS
~
S/-P
4
-6
r---
01
LATCH
~ 0 """
10
;--
CLOCK
0
CLOCK
I CLOCK
:J
1
LS04
GND-
0
KEYBOARD CLOCK
I
DRV
j.--
9
l
-6
4.1K OHM
PB 6
,.
LSl25
+5V
PCL K
Figure 5. KEYBOARD INTERFACE BLOCK DIAGRAM
2-15

IBM 5150 Specifications

General

Processor	Intel 8088
Clock Speed	4.77 MHz
RAM	16 KB - 256 KB
Manufacturer	IBM
Model	5150
Release Year	1981
Storage	5.25-inch floppy drives
Graphics	MDA or CGA
Operating System	IBM PC DOS
Ports	Cassette, keyboard
Expansion Slots	5