IBM XT 5160 Technical Reference page 19

System Block Diagram (Portable)
The following is a system block diagram of the IBM Portable
Personal Computer.
SYSTEM UNIT
Composite CRT
8
Interrupt Speaker
Levels Adapter
4
Channels Keyboard
Direct Memory Adapter
Access Keyboard
Speaker
Power Supply
114 Watt
4
Level
Read-Only
Memory
Oscillator
System Board
8088
Memory
Math
Coprocessor
(Optional)
6
7
8
3
4
5
2 ~Diskette Adapter
4
Extender Card to Receiver Card*
~ ~Color/Graphics
Adapter
See the Expansion Unit Block Diagram
Note: A "System to Adapter Compatibility Chart," to identify
the adapters supported by each system, and an "Option to
Adapter Compatibility Chart," to identify the options supported
by each adapter, can be found in the front matter of the Technical
Reference Options and Adapters manual, Volume 1.
xviii