DC420 Hard Disk/Floppy Controller Settings and Configuration

Data bus:	32-bit, VL-bus
Size:	Three/quarter-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 - external	CN1
9-pin serial port 1 - external	CN2
10-pin serial port 2 - internal	CN3
34-pin control cable connector - floppy drive	J1
40-pin IDE (AT) Interface connector	J3
4-pin connector - drive active LED	JP3

USER CONFIGURABLE SETTINGS
Function		Location	Setting
»	Main board supports VL-bus ID3 (speed < 50MHz)	JP1	pins 1 & 2 closed
	Main board does not support VL-bus ID3 (speed > 50MHz)	JP1	pins 2 & 3 closed
»	Factory configured - do not alter	JP2	pins 1 & 2 closed
»	Floppy drive enabled	JP4/G	pins 1 & 2 closed
	Floppy drive disabled	JP4/G	pins 2 & 3 closed

SERIAL PORT 1 (CN2) CONFIGURATION
COM/Address/IRQ		JP4/A	JP4/B
»	COM1/3F8h/IRQ4	pins 1 & 2 closed	pins 2 & 3 closed
	COM3/3E8h/IRQ4	pins 2 & 3 closed	pins 1 & 2 closed
	Disabled	pins 2 & 3 closed	pins 2 & 3 closed

SERIAL PORT 2 (CN3) CONFIGURATION
COM/Address/IRQ		JP4/C	JP4/D
»	COM2/2F8h/IRQ3	pins 1 & 2 closed	pins 2 & 3 closed
	COM4/2E8h/IRQ3	pins 2 & 3 closed	pins 1 & 2 closed
	Disabled	pins 2 & 3 closed	pins 2 & 3 closed

PARALLEL PORT (CN1) CONFIGURATION
Address/IRQ		JP4/E	JP4/F	JP4/H
»	378h/IRQ7	pin 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed
	3BCh/IRQ7	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed
	278h/IRQ5	pins 2 & 3 closed	pins 1 & 2 closed	pins 1 & 2 closed
	Disabled	pins 2 & 3 closed	pins 2 & 3 closed	all pins open

PARALLEL PORT BI-DIRECTIONAL FUNCTION
Setting	JP5
Bi-directional	open
Uni-directional	closed

MEMORY CONFIGURATION
Size		Bank 0	Bank 1
»	512KB	(1) 512K x 8	None
	1MB	(1) 512K x 8	(4) 256K x 4