AHA-1540 Hard Disk/Floppy Controller Settings and Configuration

Data bus:	16-bit ISA
Size:	Full-length, full-height card
Hard drive supported:	Up to seven SCSI drives
Floppy drives supported:	None

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

USER CONFIGURABLE SETTINGS
Function		Location	Setting
»	Synchronous negotiation disabled	J1/A	open
	Synchronous negotiation enabled	J1/A	closed
»	Factory configured - do not alter	J1/B	open
»	Parity enabled	J1/C	open
	Parity disabled	J1/C	closed
»	Wait state disabled	J4	N/A
	Wait state enabled	J4	N/A

SCSI ADDRESS CONFIGURATION
Address		J1/D	J1/E	J1/F
»	7	open	open	open
	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

DMA CHANNEL SELECTION
Channel		J1/G	J1/H	J6/A	J6/B	J6/C
»	5	open	closed	open	closed	open
	0	closed	closed	closed	open	open
	6	closed	open	open	open	closed
	7	open	open	open	open	open

DMA CHANNEL SELECTION (CON’T)
Channel		J6/D	J7/A	J7/B	J7/C	J7/D
»	5	open	open	closed	open	open
	0	open	closed	open	open	open
	6	open	open	open	closed	open
	7	closed	open	open	open	closed

AT INTERRUPT SELECTION
IRQ		J1/I	J1/J	J1/K	J8/A	J8/B
»	11	open	closed	open	open	open
	9	open	open	open	closed	open
	10	closed	open	open	open	closed
	12	closed	closed	open	open	open
	14	open	open	closed	open	open
	15	closed	open	closed	open	open
	Not defined	open	closed	closed	N/A	N/A
	Not defined	closed	closed	closed	N/A	N/A

AT INTERRUPT SELECTION (CON’T)
IRQ		J8/C	J8/D	J8/E	J8/F
»	11	closed	open	open	open
	9	open	open	open	open
	10	open	open	open	open
	12	open	closed	open	open
	14	open	open	closed	open
	15	open	open	open	closed

PORT ADDRESS SELECTION
Address		J9/A	J9/B	J9/C	J9/D	J9/E	J9/F	J9/G	J9/H
»	330h	open	open	closed	closed	open	open	closed	closed
	004h	closed	open	open	open	open	open	open	open
	008h	open	closed	open	open	open	open	open	open
	010h	open	open	closed	open	open	open	open	open
	020h	open	open	open	closed	open	open	open	open
	040h	open	open	open	open	closed	open	open	open
	080h	open	open	open	open	open	closed	open	open
	100h	open	open	open	open	open	open	closed	open
	200h	open	open	open	open	open	open	open	closed

AT BIOS ADDRESS SELECTION
Address		J10/A	J10/B	J10/C
»	DC000h	open	open	open
	C8000h	closed	open	closed
	D8000h	open	open	closed
	CC000h	closed	open	open