Card Type	Serial card
Chip Set	Unidentified
I/O Options	Serial port
Data Bus	8-bit ISA

CONNECTIONS
Function	Label
Serial port	P1

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Factory configured – do not alter	E1	Unidentified
»	Factory configured – do not alter	E7	Unidentified
	DMA tri state drivers permanently enabled	E9	Pins 1 & 3 closed
	DMA tri state drivers enabled by status control port bit 7	E9	Pins 2 & 4 closed
»	Factory configured – do not alter	E11	Unidentified
»	Factory configured – do not alter	E12	Unidentified
»	Factory configured – do not alter	E13	Unidentified
»	Factory configured – do not alter	E14	Unidentified
»	Factory configured – do not alter	SW2	Unidentified

SERIAL PORT 1 SELECTION
Setting		E6
»	Transmit clock output (TXC out)	Pins 1 & 2 closed
	Transmit clock input (TXC in)	Pins 3 & 4 closed
	Terminal timing source from SCC TRXC pin or input to TXC pin 24 on P1	Pins 5 & 6 closed
	Terminal timing source input to RXC pins is echoed to pin 24 on P1	Pins 7 & 8 closed
	Receive clock input	Pins 11 & 12 closed

SERIAL PORT 2 SELECTION
Setting		E3
»	Transmit clock output (TXC out)	Pins 1 & 2 closed
	Transmit clock input (TXC in)	Pins 3 & 4 closed
	Terminal timing source from SCC TRXC pin or input to TXC pin 24 on P1	Pins 5 & 6 closed
	Terminal timing source input to RXC pins is echoed to pin 24 on P1	Pins 7 & 8 closed
	Receive clock input	Pins 11 & 12 closed

INPUT/OUTPUT CLOCK MODE SELECTION (PORT 1)
Setting	E10
Transmit clock output	Pins 1 & 2 closed
Transmit clock input	Pins 3 & 4 closed
Not used	Pins 5 & 6 open
Receive clock input	Pins 7 & 8 closed

INPUT/OUTPUT CLOCK MODE SELECTION (PORT 2)
Setting	E2
Transmit clock output	Pins 1 & 2 closed
Transmit clock input	Pins 3 & 4 closed
Not used	Pins 5 & 6 open
Receive clock input	Pins 7 & 8 closed

SERIAL PORT INTERRUPT SELECTION
IRQ		E8
	2/9	Pins 1 & 2 closed
	3	Pins 3 & 4 closed
	4	Pins 5 & 6 closed
»	5	Pins 7 & 8 closed
	Normal IRQ mode	Pins 9 & 10 closed
	Multi IRQ mode	Pins 11 & 12 closed

BASE I/O ADDRESS SELECTION
Setting		SW1/1	SW1/2	SW1/3	SW1/4	SW1/5	SW1/6	SW1/7
»	238	Off	On	On	On	Off	Off	Off
	280	Off	On	Off	On	On	On	On
	2A0	Off	On	Off	On	Off	On	On
	2E8	Off	On	Off	Off	Off	On	Off
	300	Off	Off	On	On	On	On	On
	328	Off	Off	On	On	Off	On	Off
	3E8	Off	Off	Off	Off	Off	On	Off

DMA CHANNEL SELECTION
Channel	E4
1 – two channel mode	Pins 1 & 2 closed
3 – two channel mode	Pins 1 & 2 closed
Two channel A/B mode A3B1	Pins 3 & 4 closed
Two channel A/B mode A1B3	Pins 5 & 6 closed
Closed = channel A, Open = channel B	Pins 7 & 8
3 – acknowledges channel 3	Pins 9 & 10 closed
1 – acknowledges channel 1	Pins 11 & 12 closed

DMA SELECTION
Setting	E5
SCC channel A/B uses channel 3	Pins 1 & 2 closed
SCC channel A uses channel 3	Pins 3 & 4 closed
SCC channel A/B uses channel 1	Pins 5 & 6 closed
SCC channel A uses channel 1	Pins 7 & 8 closed
SCC channel B enabled for half duplex DMA transfers	Pins 9 & 10 closed
SCC channel A – DMA channel 1/3 for full duplex transfers	Pins 11 & 12 closed