DTC2278E (400518-89A) Hard Disk/Floppy Controller Settings and Configuration

Data Bus	32-bit VESA Local Bus
Card Size	Three-quarter length, half-height card
Hard Drives supported	Four IDE (AT) or EIDE drives
Floppy drives supported	Two 360KB, 720KB, 1.2MB, or 1.44MB drives

CONNECTIONS
Function	Location	Function	Location
10-pin serial port 2 - internal	J2	40-pin secondary IDE(AT) connector	J6
9-pin serial port 1 - external	J3	40-pin primary IDE(AT) connector	J7
16-pin game port	J4	4-pin connector - drive active LED	J8
34-pin cable connector - floppy drive	J5	25-pin parallel port - external	J9

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Game port enabled	W14	Closed
	Game port disabled	W14	Open

SERIAL PORT 1 ADDRESS SELECTION
COM		W5	W6
»	COM1 (3F8h)	Pins 1 & 2 closed	Pins 2 & 3 closed
	COM3 (3E8h)	Pins 2 & 3 closed	Pins 1 & 2 closed
	Disabled	Pins 1 & 2 closed	Pins 1 & 2 closed
	Notes: COM1 & COM3 are automatically configured to IRQ4. COM2 & COM4 are automatically configured to IRQ3.

SERIAL PORT 2 ADDRESS SELECTION
COM		W3	W4
»	COM2 (2F8h)	Pins 1 & 2 closed	Pins 2 & 3 closed
	COM4 (2E8h)	Pins 2 & 3 closed	Pins 1 & 2 closed
	Disabled	Pins 1 & 2 closed	Pins 1 & 2 closed
	Notes: COM1 & COM3 are automatically configured to IRQ4. COM2 & COM4 are automatically configured to IRQ3.

PARALLEL PORT ADDRESS SELECTION
LPT		W1	W2
»	LPT1 (378h)	Pins 2 & 3 closed	Pins 1 & 2 closed
	LPT2 (278h)	Pins 1 & 2 closed	Pins 2 & 3 closed
	LPT3 (3BCh)	Pins 2 & 3 closed	Pins 2 & 3 closed
	Disabled	Pins 1 & 2 closed	Pins 1 & 2 closed

PARALLEL PORT MODE CONFIGURATION
Mode		W7	W22
	ECP	Pins 2 & 3 closed	Pins 1 & 2 closed
	EPP	Pins 1 & 2 closed	Pins 2 & 3 closed
»	Printer	Pins 2 & 3 closed	Pins 2 & 3 closed
Note: You must select a DMA channel when using ECP mode.

DMA CONFIGURATION
Mode		W8	W9	W10	W11
	1	Closed	Open	Closed	Open
»	3	Open	Closed	Open	Closed

SERIAL PORT 1 INTERRUPT SELECTION
IRQ		W19	W20	W21
	IRQ3	Open	Closed	Open
»	IRQ4	Open	Open	Closed
	IRQ5	Closed	Open	Open

SERIAL PORT 2 INTERRUPT SELECTION
IRQ		W16	W17	W18
»	IRQ3	Open	Open	Closed
	IRQ4	Open	Closed	Open
	IRQ5	Closed	Open	Open

PARALLEL PORT INTERRUPT
IRQ		W12	W13
»	IRQ7	Open	Closed
	IRQ5	Closed	Open

MISCELLANEOUS TECHNICAL NOTES

The floppy controller in automatically configured. When a cable is attached, it is enabled; when no cable is attached it is disabled.