250-4161/250-4161A Hard Disk/Floppy Controller Settings and Configuration

Card type	Hard drive controller
Hard Drives supported	Up to 7 SCSI devices
Floppy drives supported	None
Data Bus	16-bit ISA
Card Size	Half-length, full-height card

CONNECTIONS
Function	Location	Function	Location
50-pin SCSI connector - internal	CN1	Drive active LED	LED

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	TERMPWR supplied from host adapter to SCSI interface	F1	Closed
	TERMPWR not supplied to SCSI interface	F1	Open
»	Synchronous Negotiation disabled	J1/1	Open
	Synchronous Negotiation enabled	J1/1	Closed
»	Factory configured - do not alter	J1/2	Open
»	SCSI parity check enabled	J1/3	Open
	SCSI parity check disabled	J1/3	Closed
»	Zero wait states enabled	J4	Open
	One wait state enabled	J4	Closed
»	System computer is Tandy 4000	J5	Open
	System computer is Tandy 3000	J5	Closed

DMA CHANNEL SELECTION
Channel		J1/7	J1/8	J6/1	J6/2	J6/3
	0	Closed	Closed	Closed	Open	Open
»	5	Open	Closed	Open	Closed	Open
	6	Closed	Open	Open	Open	Closed
	7	Open	Open	Open	Open	Open

DMA CHANNEL SELECTION (CONTINUED)
Channel		J6/4	J7/1	J7/2	J7/3	J7/4
	0	Open	Closed	Open	Open	Open
»	5	Open	Open	Closed	Open	Open
	6	Open	Open	Open	Closed	Open
	7	Closed	Open	Open	Open	Closed

INTERRUPT SELECTION
Setting		J1/9	J1/10	J1/11	J8/1	J8/2
	9	Open	Open	Open	Closed	Open
	10	Closed	Open	Open	Open	Closed
»	11	Open	Closed	Open	Open	Open
	13	Closed	Closed	Open	Open	Open
	14	Open	Open	Closed	Open	Open
	15	Closed	Open	Closed	Open	Open

INTERRUPT SELECTION (CONTINUED)
Setting		J8/3	J8/4	J8/5	J8/6
	9	Open	Open	Open	Open
	10	Open	Open	Open	Open
»	11	Closed	Open	Open	Open
	13	Open	Closed	Open	Open
	14	Open	Open	Closed	Open
	15	Open	Open	Open	Closed

BIOS ADDRESS SELECTION
Address		J10/1	J10/2	J10/3
	C0000h	Closed	Closed	Closed
	C4000h	Closed	Closed	Open
	C8000h	Closed	Open	Closed
	CC000h	Closed	Open	Open
	D0000h	Open	Closed	Closed
	D4000h	Open	Closed	Open
	D8000h	Open	Open	Closed
»	DC000h	Open	Open	Open

BASE I/O ADDRESS SELECTION
Setting		J9/1	J9/2	J9/3	J9/4	J9/5	J9/6	J9/7	J9/8
	004h	Closed	Open	Open	Open	Open	Open	Open	Open
	008h	Open	Closed	Open	Open	Open	Open	Open	Open
	00Ch	Closed	Closed	Open	Open	Open	Open	Open	Open
	010h	Open	Open	Closed	Open	Open	Open	Open	Open
	014h	Closed	Open	Closed	Open	Open	Open	Open	Open
»	330h	Open	Open	Closed	Closed	Open	Open	Closed	Closed
	3F0h	Open	Open	Closed	Closed	Closed	Closed	Closed	Closed
	3F4h	Closed	Open	Open	Open	Open	Open	Closed	Closed
	3F8h	Open	Open	Open	Open	Open	Open	Closed	Closed
	3FCh	Open	Closed	Closed	Closed	Closed	Closed	Closed	Closed
	3FFh	Closed	Closed	Closed	Closed	Closed	Closed	Closed	Closed
Note: The switches are a binary representation of the decimal memory addresses. SW1/8 is the Most Significant Bit and switch SW1/1 is the Least Significant Bit. The switches have the following decimal values: SW1/8=512, SW1/7=256, SW1/6=128, SW1/5=64, SW1/4=32, SW1/3=16, SW1/2=8, SW1/1=4. Add the values of the closed jumpers to obtain the correct memory address. (Closed=1, Open=0)

ID SELECTION
SCSI ID		J1/4	J1/5	J1/6
	0	Closed	Closed	Closed
»	1	Open	Closed	Closed
	2	Closed	Open	Closed
	3	Open	Open	Closed
	4	Closed	Closed	Open
	5	Open	Closed	Open
	6	Closed	Open	Open
	7	Open	Open	Open

TERMINATION SELECTION
Setting		RN6	RN7
»	Termination enabled	Installed	Installed
	Termination disabled	Removed	Removed
Note: Terminators should be removed if inline terminators are used or the host adapter is not at the end of the SCSI bus.