IBM 5150

CONTENTS
SECTION 1. HARDWARE OVERVIEW ......... 1-1
System Block Diagram ............................ 1-4
SECTION 2. HARDWARE ...................... 2-1
System Board ................................... 2-3
System Board
Data Flow .......................... 2-6
I/O Channel ..................................... 2-8
I/O Channel Diagram ............................ 2-9
System Board
I/O Channel Description ............. 2-10
System Board Component Diagram
................. 2-13
Keyboard
........................................ 2-14
Keyboard Interface Block Diagram
................. 2-15
Keyboard Diagram
............................... 2-16
Keyboard Scan Codes
............................. 2-17
Keyboard Interface Connector Specifications
......... 2-18
Cassette User Interface
............................ 2-19
Cassette Jumpers
............................... 2-19
Circuit Block Diagrams
......................... 2-19
Cassette Interface Connector Specifications
.......... 2-21
Speaker Interface
................................. 2-22
Speaker Drive System Block Diagram
............. 2-22
I/O Address Map ................................. 2-23
System Memory Map
............................. 2-25
System Board And Memory Expansion Switch Settings
... 2-28
5
1/4" Diskette Drives Switch Settings .............. 2-29
Monitor Type Switch Settings
.... , ..... , ........... 2-29
System Board Memory Switch Settings
.............. 2-30
32/64
KB Memory Expansion Option Switch Settings ... 2-31
Power Supply
................................... 2-33
Power Supply Location
............................ 2-34
Input Requirements
............................... 2-34
DC Output ...................................... 2-34
AC Output ...................................... 2-34
Power Supply Connectors And Pin Assignments
...... 2-35
Important Operating Characteristics
................. 2-36
Over Voltage/Current Protection
................. 2-36
Signal Requirements
............................ 2-36
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