IBM XT 5160 User Manual

The speaker connection is a 4-pin Berg connector.
Pin
Function
P3
1
Data out
2
Key
3
Ground
4 +5 Vdc
Speaker Connector (P3)
8255A I/O Bit Map
The 8255A I/O Bit Map shows the inputs and outputs for the
Command/Mode register on the system board. Also shown are
the switch settings for the memory, display, and number of
diskette drives. The following page contains the I/O bit map.
System Board 1-27

IBM XT 5160 Specifications

General

Brand	IBM
Model	XT 5160
Category	Desktop
Language	English