IPC8255/8254 IO card Settings and Configuration

Card Type	Data acquisition
Chipset	8254/8255
I/O Options	Digital I/O lines (24)
Data Bus	IPCCPU expansion bus

CONNECTIONS
Function	Label	Function	Label
IPCCPU expansion bus	P1	8254 clock signals (see pinout below)	P3
8255 digital I/O lines 1-24 (see pinout below)	P2	Unidentified	P4

P2 PINOUT
Function	Pin	Function	Pin
Channel 0 bit 0	1	Channel 1 bit 5	14
Channel 0 bit 1	2	Channel 1 bit 6	15
Channel 0 bit 2	3	Channel 1 bit 7	16
Channel 0 bit 3	4	Channel 2 bit 0	17
Channel 0 bit 4	5	Channel 2 bit 1	18
Channel 0 bit 5	6	Channel 2 bit 2	19
Channel 0 bit 6	7	Channel 2 bit 3	20
Channel 0 bit 7	8	Channel 2 bit 4	21
Channel 1 bit 0	9	Channel 2 bit 5	22
Channel 1 bit 1	10	Channel 2 bit 6	23
Channel 1 bit 2	11	Channel 2 bit 7	24
Channel 1 bit 3	12	Ground	25
Channel 1 bit 4	13	+5V DC power	26

P3 PINOUT
Function	Pin	Function	Pin
Channel 1 bit 0	1	Clock signal 1 in	8
Clock signal 0 in	2	Channel 1 bit 4	9
Channel 1 bit 1	3	Gate signal 1 out	10
Gate signal 0 out	4	Channel 1 bit 5	11
Channel 1 bit 2	5	Clock signal 1 out	12
Clock signal 0 out	6	Channel 1 bit 6	13
Channel 1 bit 3	7	Clock signal 2 in	14

P3 PINOUT (CON’T)
Function	Pin	Function	Pin
Channel 1 bit 7	15	4.9152MHz clock signal	21
Gate signal 2 out	16	Inverse of clock signal 1 out	22
TO1 signal	17	2.4576MHz clock signal	23
Clock signal 2 out	18	Inverse of clock signal 2 out	24
9.8304MHz clock signal	19	Ground	25
Inverse of clock signal 0 out	20	+5V DC power	26

USER CONFIGURABLE SETTINGS
Setting		Label	Position
»	Card is first card	JP2	Pins 3 & 4 closed
	Card is second card	JP2	Pins 1 & 2 closed

BASE I/O ADDRESS SELECTION
Setting		JP1/A	JP1/B	JP1/C	JP1/D	JP1/E
	90h	Closed	Open	Open	Open	Open
	A0h	Open	Closed	Open	Open	Open
»	B0h	Open	Open	Closed	Open	Open
	C0h	Open	Open	Open	Closed	Open
	E0h	Open	Open	Open	Open	Closed

CLOCK 0 RATE SELECTION
Setting		JP3/A	JP3/B	JP3/C
»	2.4576MHz	Open	Open	Closed
	4.9152MHz	Open	Closed	Open
	9.8304MHz	Closed	Open	Open

CLOCK 1 RATE SELECTION
Setting		JP4/A	JP4/B	JP4/C
»	2.4576MHz	Open	Open	Closed
	4.9152MHz	Open	Closed	Open
	9.8304MHz	Closed	Open	Open

CLOCK 2 RATE SELECTION
Setting		JP5/A	JP5/B	JP5/C
»	2.4576MHz	Open	Open	Closed
	4.9152MHz	Open	Closed	Open
	9.8304MHz	Closed	Open	Open

MISCELLANEOUS TECHNICAL NOTES

This card is designed to be used with Decision Computer International Co., Ltd.’s IPCCPU board. See this document for more information.