1-2
Introduction
General description
Figure 1-1
PIO-24 block diagram
Referring to the block diagram, the PIO-24 is a high-current, 24-line, parallel, dig-
ital I/O interface board for the IBM PC or PC-compatible. The board emulates an
8255 Programmable Peripheral Interface Control Word MODE 0. (While the Keithley
PIO-12 also uses an 8255 Programmable Peripheral Interface chip, it drives much less
current than the PIO-24.)
The PIO-24 and computer with DriverLINX software requires:
•
an IBM PC or compatible AT (386, or Pentium CPU) with minimum of 2 MB
of memory
•
at least one floppy disk drive, and one fixed disk drive
•
Microsoft Windows 95/98, or Windows NT 4.0 or higher
•
a compiler supporting Microsoft Windows development
•
a mouse is highly recommended.
PC Bus
Data Bus
Buffer
Address
Decoder
Direction
Control
Rear Connector
Address
Selector
Switch
Interrupt
Level
Selector
D0
D7
Data
A0
A9
Address
IOR/
IOW/
IRQ2
IRQ7
Interrupt
P
O
W
E
R
PA
PB
PC
24 Lines of Digital I/O
Interrupt Input
Interrupt Enable
+5V
-5V
+12V
-12V
Common
L
A
T
C
H
D
R
I
V
E
R
B
U
F
F
E
R
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