Card Type	Serial card
Chip Set	Unidentified
I/O Options	Serial port
Data Bus	16-bit ISA

CONNECTIONS
Function	Label
Serial port	S1

SERIAL PORT 1 ADDRESS SELECTION
Setting		JP1
»	COM1	Pins 1 & 2 closed
	COM2	Pins 3 & 4 closed
	COM3	Pins 5 & 6 closed
	COM4	Pins 7 & 8 closed
	COM5	Pins 9 & 10 closed
	COM6	Pins 11 & 12 closed
	COM7	Pins 13 & 14 closed
	COM8	Pins 15 & 16 closed

SERIAL PORT 2 ADDRESS SELECTION
Setting		JP2
	COM1	Pins 1 & 2 closed
»	COM2	Pins 3 & 4 closed
	COM3	Pins 5 & 6 closed
	COM4	Pins 7 & 8 closed
	COM5	Pins 9 & 10 closed
	COM6	Pins 11 & 12 closed
	COM7	Pins 13 & 14 closed
	COM8	Pins 15 & 16 closed

SERIAL PORT 3 ADDRESS SELECTION
Setting		JP3
	COM1	Pins 1 & 2 closed
	COM2	Pins 3 & 4 closed
»	COM3	Pins 5 & 6 closed
	COM4	Pins 7 & 8 closed
	COM5	Pins 9 & 10 closed
	COM6	Pins 11 & 12 closed
	COM7	Pins 13 & 14 closed
	COM8	Pins 15 & 16 closed

SERIAL PORT 4 ADDRESS SELECTION
Setting		JP4
	COM1	Pins 1 & 2 closed
	COM2	Pins 3 & 4 closed
	COM3	Pins 5 & 6 closed
»	COM4	Pins 7 & 8 closed
	COM5	Pins 9 & 10 closed
	COM6	Pins 11 & 12 closed
	COM7	Pins 13 & 14 closed
	COM8	Pins 15 & 16 closed

SERIAL PORT 1 INTERRUPT SELECTION
IRQ		JP5
»	3	Pins 1 & 2 closed
	4	Pins 3 & 4 closed
	5	Pins 5 & 6 closed
	6	Pins 7 & 8 closed
	7	Pins 9 & 10 closed
	9	Pins 11 & 12 closed
	10	Pins 13 & 14 closed
	11	Pins 15 & 16 closed
	12	Pins 17 & 18 closed
	15	Pins 19 & 20 closed

SERIAL PORT 2 INTERRUPT SELECTION
IRQ		JP6
	3	Pins 1 & 2 closed
»	4	Pins 3 & 4 closed
	5	Pins 5 & 6 closed
	6	Pins 7 & 8 closed
	7	Pins 9 & 10 closed
	9	Pins 11 & 12 closed
	10	Pins 13 & 14 closed
	11	Pins 15 & 16 closed
	12	Pins 17 & 18 closed
	15	Pins 19 & 20 closed

SERIAL PORT 3 INTERRUPT SELECTION
IRQ		JP7
»	3	Pins 1 & 2 closed
	4	Pins 3 & 4 closed
	5	Pins 5 & 6 closed
	6	Pins 7 & 8 closed
	7	Pins 9 & 10 closed
	9	Pins 11 & 12 closed
	10	Pins 13 & 14 closed
	11	Pins 15 & 16 closed
	12	Pins 17 & 18 closed
	15	Pins 19 & 20 closed

SERIAL PORT 4 INTERRUPT SELECTION
IRQ		JP8
	3	Pins 1 & 2 closed
»	4	Pins 3 & 4 closed
	5	Pins 5 & 6 closed
	6	Pins 7 & 8 closed
	7	Pins 9 & 10 closed
	9	Pins 11 & 12 closed
	10	Pins 13 & 14 closed
	11	Pins 15 & 16 closed
	12	Pins 17 & 18 closed
	15	Pins 19 & 20 closed

SERIAL PORT 1 CLOCK SPEED SELECTION
Speed		JP9
»	1.8432MHz	Pins 1 & 2 closed
	3.6864MHz	Pins 3 & 4 closed
	7.3728MHz	Pins 5 & 6 closed

SERIAL PORT 2 CLOCK SPEED SELECTION
Speed		JP10
»	1.8432MHz	Pins 1 & 2 closed
	3.6864MHz	Pins 3 & 4 closed
	7.3728MHz	Pins 5 & 6 closed

SERIAL PORT 3 CLOCK SPEED SELECTION
Speed		JP11
»	1.8432MHz	Pins 1 & 2 closed
	3.6864MHz	Pins 3 & 4 closed
	7.3728MHz	Pins 5 & 6 closed

SERIAL PORT 4 CLOCK SPEED SELECTION
Speed		JP12
»	1.8432MHz	Pins 1 & 2 closed
	3.6864MHz	Pins 3 & 4 closed
	7.3728MHz	Pins 5 & 6 closed

CONFIGURATION MODE SELECTION
Mode		JP13	JP14	JP15
»	DOS mode	Pins 1 & 2 closed	Pins 1 & 2 closed	Open
	AST/UNIX mode	#1	Pins 3 & 4 closed	#2
Note: #1 = setting will depend on desired base address. #2 will depend which IRQ is shared with COM ports. Base address settings are listed below.

BASE ADDRESS SELECTION
COM port	JP13/pins 1 & 2 (DOS)	JP13/pins 1 & 2, 3 & 4 (DOS EXT)	JP13/pins 1 & 2, 5 & 6 (DOS MD1)
1	3F8	3E0	3A0
2	2F8	2F0	3A8
3	3E8	3E8	3B0
4	2E8	2E8	3B8
5	3E0	250	2A0
6	2F0	258	2A8
7	2E0	260	2B0
8	260	268	2B8

BASE ADDRESS SELECTION (CON’T)
COM port	JP13/pins 1 & 2, 7 & 8 (DOS MD2)	JP13/pins 1 & 2, 3 & 4, 5 & 6 (DOS EXT MD1)	JP13/pins 1 & 2, 3 & 4, 7 & 8 (DOS EXT MD2)
1	338	360	340
2	238	260	240
3	328	350	330
4	228	250	230
5	1A0	180	250
6	1A8	188	258
7	1B0	190	260
8	1B8	198	268

MISCELLANEOUS TECHNICAL NOTE

If board is configured in an AST/UNIX mode, the system/software must be able to support the use of one IRQ for all four COM ports that are assigned. Before configuring in an AST/UNIX mode, make sure the system is capable