■
I1
AO
cn
-0
i
A9 r
Address
Decoder
Address
Selector
10R/ I
Switch
IOW/ r
IRQ21
o
t i I I
o
Q
A
Interrupt
Level
Selector
2
o
o
A
O
IRQ71
1
Overview
General Description
The P10-12 is a 24-line, parallel, digital I/O interface board for
IBM PC/XT, PC AT, and compatible computers. This board provides a
flexible interface for a variety of parallel I/O devices, including
instruments, displays and user-assembled systems. Figure 1-1 shows a
block diagram of the P10-12.
PC Bus
DO
o
D7
Data Bus
Buffer
01
,
8255
PP I
Rear Connector
> PA I
PB
PC
Interrupt Input
I Interrupt Enable
+5 V
I-5 V
+12 V
-12 V
Common
Figure 1-1. Block Diagram of the P10-12
1-1
Содержание PIO-12
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