CONNECTIONS
Function	Location
50-pin SCSI connector-internal	J1
50-pin SCSI connector-external (Models 8x2 only)	J2
34-pin control cable connector-floppy drive	J3
4-pin connector-drive active LED	J4

USER CONFIGURABLE SETTINGS
Function		Location	Setting
»	SCSI parity check enabled	W3	closed
	SCSI parity check disabled	W3	open
»	Factory configured - do not alter	W4	open
»	Factory configured - do not alter	W10	open
»	AT-type floppy drives supported (Models 82x only)	W11	open
	Non-stand. floppy drives supported (Models 82x only)	W11	closed
	Factory set on board 32K PROM size	W15	open
»	Factory configured - do not alter	W26	open
»	SCSI-2 RSVD lines grounded (terminators installed)	W32	closed
	SCSI-2 RSVD lines not grounded (terminators removed)	W32	open
»	Floppy drive port address is 3F0-3F7 (Models 82x only)	W33	pins 1 & 2 closed
	Floppy drive port address is 370-377 (Models 820x only)	W33	pins 2 & 3 closed
»	Floppy drive enabled	W35	closed
	Floppy drive disabled	W35	open
»	Power-ground and chassis-ground separate	W44	open
	Power-ground and chassis-ground connected	W44	closed

SCSI ADDRESS
Address		W0	W1	W2
	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

BIOS ADDRESS
Select		W15	W16	W17
	C0000h	closed	closed	closed
	C8000h	open	closed	closed
	D0000h	closed	open	closed
»	D8000h	open	open	closed
	E0000h	closed	closed	open
	E8000	open	closed	open
	F0000h	closed	open	open
	F8000h	open	open	open

I/O PORT ADDRESS
Address		W5	W6	W7	W8	W9
	100	closed	closed	closed	open	closed
	120	open	closed	closed	open	closed
	140	closed	open	closed	open	closed
	160	open	open	closed	open	closed
	180	closed	closed	open	open	closed
	1A0	open	closed	open	open	closed
	1C0	closed	open	open	open	closed
	1E0	open	open	open	open	closed
	200	closed	closed	closed	closed	open
	220	open	closed	closed	closed	open
	240	closed	open	closed	closed	open
	260	open	open	closed	closed	open
	280	closed	closed	open	closed	open
	2A0	open	closed	open	closed	open
	2C0	closed	open	open	closed	open
	2E0	open	open	open	closed	open
	300	closed	closed	closed	open	open
	320	open	closed	closed	open	open
»	340	closed	open	closed	open	open
	360	open	open	closed	open	open
	380	closed	closed	open	open	open
	3A0	open	closed	open	open	open
	3C0	closed	open	open	open	open
	3E0	open	open	open	open	open

DMA CHANNEL
Channel		W20	W21	W22	W23	W24	W25
	DRQ3	closed	open	open	open	closed	closed
»	DRQ5	open	closed	open	open	closed	open
	DRQ6	open	open	closed	open	open	closed
	DRQ7	open	open	open	closed	open	open

INTERRUPT REQUEST
IRQ		W27	W28	W29	W30
	Disabled	N/A	N/A	N/A	closed
	IRQ3	closed	closed	closed	open
	IRQ4	open	closed	closed	open
	IRQ5	closed	open	closed	open
	IRQ6	open	closed	closed	open
	IRQ7	closed	closed	open	open
»	IRQ12	open	closed	open	open
	IRQ14	closed	open	open	open
	IRQ15	open	open	open	open

MISCELLANEOUS TECHNICAL NOTES

W12-14, W31, W34, W36, W37, W43, W45 are factory configurable or Not used and are hard wired on some board revisions. The default for these jumpers is "open", with a jumper stored on pin 2.