Card Type	Data acquisition
Chip Set	NEC 8255
I/O Options	Digital I/O ports (2)
Data Bus	8-bit ISA

CONNECTIONS
Function	Label	Function	Label
Digital I/O port 1 (see pinout below)	CN1	Digital I/O port 2 (see pinout below)	CN2

CN1 PINOUT
Function	Pin	Function	Pin
Ground	1	Channel 1C bit 6	21
Ground	2	Channel 1C bit 7	22
Ground	3	Channel 1C bit 4	23
Channel 1A bit 3	4	Channel 1C bit 5	24
Channel 1A bit 1	5	Channel 1C bit 1	25
Channel 1A bit 2	6	Channel 1C bit 0	26
Clock signal 0 in	7	Channel 1B bit 7	27
Channel 1A bit 0	8	Channel 1C bit 2	28
Gate signal 0	9	Channel 1B bit 6	29
Clock signal 0 out	10	Channel 1C bit 3	30
Clock signal 2 out	11	Channel 1B bit 5	31
Clock signal 2 in	12	Channel 1B bit 0	32
Clock signal 1 in	13	Channel 1B bit 4	33
Gate signal 2	14	Channel 1B bit 1	34
Clock signal 1 out	15	Channel 1B bit 3	35
Gate signal 1	16	Channel 1B bit 2	36
Channel 1A bit 5	17	+5V power	37
Channel 1A bit 4	18	-5V power	38
Channel 1A bit 7	19	+12V power	39
Channel 1A bit 6	20	-12V power	40

CN2 PINOUT
Function	Pin	Function	Pin
Ground	1	Channel 2C bit 7	21
Ground	2	Channel 2C bit 6	22
Ground	3	Channel 2C bit 5	23
Ground	4	Channel 2C bit 4	24
Ground	5	Channel 2C bit 0	25
Ground	6	Channel 2C bit 1	26
Ground	7	Channel 2C bit 2	27
Ground	8	Channel 2B bit 7	28
Ground	9	Channel 2C bit 3	29
Ground	10	Channel 2B bit 6	30
Ground	11	Channel 2B bit 0	31
Ground	12	Channel 2B bit 5	32
Channel 2A bit 0	13	Channel 2B bit 1	33
Channel 2A bit 1	14	Channel 2B bit 4	34
Channel 2A bit 2	15	Channel 2B bit 2	35
Channel 2A bit 3	16	Channel 2B bit 3	36
Channel 2A bit 4	17	+5V power	37
Channel 2A bit 5	18	-5V power	38
Channel 2A bit 6	19	+12V power	39
Channel 2A bit 7	20	-12V power	40

USER CONFIGURABLE SETTINGS
Setting		Label	Position
»	Counter 0 uses internal clock source	JP1/A	Closed
	Counter 0 uses external clock source	JP1/A	Open
»	Counter 1 uses internal clock source	JP1/B	Closed
	Counter 1 uses external clock source	JP1/B	Open
»	Counter 2 uses internal clock source	JP1/C	Closed
	Counter 2 uses external clock source	JP1/C	Open
»	Base I/O address set to 1B0h	JP2	Closed
	Base I/O address set to 1F0h	JP2	Open

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
1PA0	Red	On	Channel 1A bit 0 is active
1PA0	Red	Off	Channel 1A bit 0 is not active
1PA1	Red	On	Channel 1A bit 1 is active
1PA1	Red	Off	Channel 1A bit 1 is not active
1PA2	Red	On	Channel 1A bit 2 is active
1PA2	Red	Off	Channel 1A bit 2 is not active
1PA3	Red	On	Channel 1A bit 3 is active
1PA3	Red	Off	Channel 1A bit 3 is not active
1PA4	Red	On	Channel 1A bit 4 is active
1PA4	Red	Off	Channel 1A bit 4 is not active
1PA5	Red	On	Channel 1A bit 5 is active
1PA5	Red	Off	Channel 1A bit 5 is not active
1PA6	Red	On	Channel 1A bit 6 is active
1PA6	Red	Off	Channel 1A bit 6 is not active
1PA7	Red	On	Channel 1A bit 7 is active
1PA7	Red	Off	Channel 1A bit 7 is not active
2PA0	Red	On	Channel 2A bit 0 is active
2PA0	Red	Off	Channel 2A bit 0 is not active
2PA1	Red	On	Channel 2A bit 1 is active
2PA1	Red	Off	Channel 2A bit 1 is not active
2PA2	Red	On	Channel 2A bit 2 is active
2PA2	Red	Off	Channel 2A bit 2 is not active
2PA3	Red	On	Channel 2A bit 3 is active
2PA3	Red	Off	Channel 2A bit 3 is not active
2PA4	Red	On	Channel 2A bit 4 is active
2PA4	Red	Off	Channel 2A bit 4 is not active
2PA5	Red	On	Channel 2A bit 5 is active
2PA5	Red	Off	Channel 2A bit 5 is not active
2PA6	Red	On	Channel 2A bit 6 is active
2PA6	Red	Off	Channel 2A bit 6 is not active
2PA7	Red	On	Channel 2A bit 7 is active
2PA7	Red	Off	Channel 2A bit 7 is not active