AHA-1540B, AHA-1542B Hard Disk/Floppy Controller Settings and Configuration

Data bus:	16-bit, ISA
Size:	Three-quarter length, full-height card
Hard drives supported:	Up to seven SCSI devices
Floppy drives supported:	Two 360KB, 720KB, 1.2MB or 1.44MB (AHA-1542B) None (AHA-1540B, HA-101S)

CONNECTIONS
Function	Location
34-pin data cable connector-floppy drive	CN1
50-pin SCSI connector-internal	CN2
50-pin SCSI connector-external	CN3
4-pin connector-drive active LED	CN4

SCSI ADDRESS
Select		J5/jumper 4	J5/jumper 5	J5/jumper 6
»	7	open	open	open
	6	closed	open	open
	5	open	closed	open
	4	closed	closed	open
	3	open	open	closed
	2	closed	open	closed
	1	open	closed	closed
	0	closed	closed	closed

USER CONFIGURABLE SETTINGS
Function		Location	Setting
»	SCSI synchronous negotiation disabled	J5/jumper 1	open
	SCSI synchronous negotiation enabled	J5/jumper 1	closed
»	Normal operation	J5/jumper 2	open
	Self diagnostics enabled	J5/jumper 2	closed
»	SCSI parity check enabled	J5/jumper 3	open
	SCSI parity check disabled	J5/jumper 3	closed
»	BIOS enabled	J6/jumper 1	closed
	BIOS disabled	J6/jumper 1	open
»	Not used	J6/jumpers 2-4	open
»	Auto sense enabled	J6/jumper 5	open
	Auto sense disable	J6/jumper 5	closed
»	Floppy drive port address 3F0-3F7h	J7/jumper 1	open
	Floppy drive port address 370-377h	J7/jumper 1	closed
»	Floppy drive enabled	J8/jumper 1	closed
	Floppy drive disabled	J8/jumper 1	open
»	Floppy drive DMA Request is DREQ2	J8/jumper 2	closed
	Floppy drive DMA Request is DREQ3	J8/jumper 3	closed
»	Floppy drive DMA Acknowledge Is DACK2	J8/jumper 4	closed
	Floppy drive DMA Acknowledge is DACK3	J8/jumper 5	closed
»	Floppy drive Interrupt is IRQ6	J8/jumper 6	closed
	Floppy drive Interrupt is IRQ10	J8/jumper 7	closed
»	Floppy drive dual speed disabled	J8/jumper 8	open
	Floppy drive dual speed enabled	J8/jumper 8	closed
»	AT Bus DMA Request is DREQ5	J9/jumper 2	closed
	AT Bus DMA Request is DREQ0	J9/jumper 1	closed
	AT Bus DMA Request is DREQ6	J9/jumper 3	closed
	AT Bus DMA Request is DREQ7	J9/jumper 4	closed
	AT Bus DMA Acknowledge is DACK0	J9/jumper 5	closed
»	AT Bus DMA Acknowledge is DACK5	J9/jumper 6	closed
	AT Bus DMA Acknowledge is DACK6	J9/jumper 7	closed
	AT Bus DMA Acknowledge is DACK7	J9/jumper 8	closed
	Hard drive Interrupt is IRQ9	J9/jumper 9	closed
	Hard drive Interrupt is IRQ10	J9/jumper 10	closed
»	Hard drive Interrupt is IRQ11	J9/jumper 11	closed
	Hard drive Interrupt is IRQ12	J9/jumper 12	closed
	Hard drive Interrupt is IRQ14	J9/jumper 13	closed
	Hard drive Interrupt is IRQ15	J9/jumper 14	closed

DMA CHANNEL
DRQ		J5/jumper 7	J5/jumper 8
»	5	open	closed
	6	closed	open
	7	open	open
	0	closed	closed

INTERRUPT REQUEST
IRQ		J5/jumper 9	J5/jumper 10	J5/jumper 11
	9	open	open	open
	10	closed	open	open
»	11	open	closed	open
	12	closed	closed	open
	14	open	open	closed
	15	closed	open	closed

DMA TRANSFER RATE
Speed		J5/jumper 12	J5/jumper 13
	5.0Mb/s	open	open
»	5.7Mb/s	closed	open
	6.7Mb/s	open	closed
	8.0Mb/s	closed	closed

I/O PORT ADDRESS
Address		J7/jumper 2	J7/jumper 3	J7/jumper 4
»	í 334h	open	open	open
»	330h	closed	open	open
	234h	open	closed	open
	230h	closed	closed	open
	134h	open	open	closed
	130h	closed	open	closed
	Not used	closed	closed	closed
Note: Ȓ denotes default for 1540BS11/1542BS11

BUS WAIT STATE
Wait Time		J7/jumper 5	J7/jumper 6
»	Disable	open	open
	100nsec	closed	open
	200nsec	open	closed
	300nsec	closed	closed

MISCELLANEOUS TECHNICAL NOTE

Note: Manufacturer documentation does not specify possible BIOS memory addresses, but a selection of DC00:6 has been recommended by some card users.