DELL 486DX/XX REV.3 I/O CARD Hard Disk/Floppy Controller Settings and Configuration

Data bus:	16-bit, ISA
Size:	Half-length, full-height card
Hard drive supported:	Two IDE (AT) Interface drives
Floppy drives supported:	Two 360KB, 720KB, 1.2MB, or 1.44MB drives

CONNECTIONS
Function	Location
25-pin parallel port	CN1
10-pin serial port - external	CN2
10-pin serial port - internal	J3
40-pin IDE(AT) interface connector	J4
34-pin control cable connector - floppy drive	J5
4-pin connector - drive active LED	J6

SERIAL PORT 1 (CN2) CONFIGURATION
COM/Address/IRQ		J7
»	COM1/3F8h/IRQ4	pins 1 & 3, 19 & 21 closed
	COM1/3F8h/IRQ3	pins 1 & 3, 21 & 23 closed
	COM1/3F8h/IRQ5	pins 1 & 3, 15 & 17 closed
	COM1/3F8h/IRQ7	pins 1 & 3, 13 & 15 closed
	COM2/2F8h/IRQ3	pins 3 & 5, 21 & 23 closed
	COM2/2F8h/IRQ4	pins 3 & 5, 19 & 21 closed
	COM2/2F8h/IRQ5	pins 3 & 5, 15 & 17 closed
	COM2/2F8h/IRQ7	pins 3 & 5, 13 & 15 closed

SERIAL PORT INTERRUPT SELECTION
IRQ		J7
»	COM1/3F8h/IRQ4	pins 1 & 3, 19 & 21 closed
	COM1/3F8h/IRQ3	pins 1 & 3, 21 & 23 closed
	COM1/3F8h/IRQ5	pins 1 & 3, 15 & 17 closed
	COM1/3F8h/IRQ7	pins 1 & 3, 13 & 15 closed

SERIAL PORT 1 (CN2) CONFIGURATION
COM/Address/IRQ	J7
COM3/3E8h/IRQ3	pins 7 & 9, 21 & 23 closed
COM3/3E8h/IRQ4	pins 7 & 9, 19 & 21 closed
COM3/3E8h/IRQ5	pins 7 & 9, 15 & 17 closed
COM3/3E8h/IRQ7	pins 7 & 9, 13 & 15 closed
COM4/2E8h/IRQ3	pins 9 & 11, 21 & 23 closed
COM4/2E8h/IRQ4	pins 9 & 11, 19 & 21 closed
COM4/2E8h/IRQ5	pins 9 & 11, 15 & 17 closed
COM4/2E8h/IRQ7	pins 9 & 11, 13 & 15 closed
Disabled	pins 1, 3, 5, 7, 9 & 11 open

SERIAL PORT 2 (J3) CONFIGURATION
COM/Address/IRQ		J7
»	COM2/2F8h/IRQ3	pins 4 & 6, 22 & 24 closed
	COM2/2F8h/IRQ4	pins 4 & 6, 20 & 22 closed
	COM2/2F8h/IRQ5	pins 4 & 6, 16 & 18 closed
	COM2/2F8h/IRQ7	pins 4 & 6, 14 & 16 closed
	COM1/3F8h/IRQ3	pins 2 & 4, 22 & 24 closed
	COM1/3F8h/IRQ4	pins 2 & 4, 20 & 22 closed
	COM1/3F8h/IRQ5	pins 2 & 4, 16 & 18 closed
	COM1/3F8h/IRQ7	pins 2 & 4, 14 & 16 closed
	COM3/3E8h/IRQ3	pins 8 & 10, 22 & 24 closed
	COM3/3E8h/IRQ4	pins 8 & 10, 20 & 22 closed
	COM3/3E8h/IRQ5	pins 8 & 10, 16 & 18 closed
	COM3/3E8h/IRQ7	pins 8 & 10, 14 & 16 closed
	COM4/2E8h/IRQ3	pins 10 & 12, 22 & 24 closed
	COM4/2E8h/IRQ4	pins 10 & 12, 20 & 22 closed
	COM4/2E8h/IRQ5	pins 10 & 12, 16 & 18 closed
	COM4/2E8h/IRQ7	pins 10 & 12, 14 & 16 closed
	Disabled	pins 2, 4, 6, 8, 10 & 12 open

PARALLEL PORT (CN1) CONFIGURATION
LPT/Address/IRQ		J8
»	LPT1/278h/IRQ7	pins 1 & 2, 4 & 5 closed
	LPT1/278h/IRQ5	pins 1 & 2, 5 & 6 closed
	LPT2/378h/IRQ5	pins 2 & 3, 5 & 6 closed
	LPT2/378h/IRQ7	pins 2 & 3, 4 & 5 closed
	Disabled	all pins open