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IBM 5150 - Block Diagram

IBM 5150
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Several keyboard arrangements are available. These are
illustrated on the following pages.
For
information about the
keyboard routines required to implement non-U.S. keyboards,
refer to the
Guide
to
Operations and
DOS
manuals.
Block Diagram
8255A5
LS322
PAO-------lOH
OH'
PA1 OG
PA2
OF
PA3
OE
PA4------I
PA5-------l
PA6------4
PA7------4
PB7
PB6
Keyboard
Clock
1
0
IRQ1
Keyboard
2
0
Data 3
0
Reset
4
0
GND
0
5
+5V
PC
LK
--'--I---l
Keyboard Interface Block Diagram
4-4
Keyboard

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