ACB-4525S4000, ACB-4525Z Hard Disk/Floppy Controller Settings and Configuration

Data bus:	None (SCSI to ESDI interface)
Size:	Drive card
Hard drives supported:	SCSI to two RLL ESDI drives
Floppy drives supported:	None

CONNECTIONS
Function	Location
20-pin data cable connector-drive 0	CN0
20-pin data cable connector-drive 1	CN1
34-pin control cable connector-hard drive(s)	CN2
4-pin connector-DC power	CN3
50-pin SCSI connector-to host adapter	CN4

SCSI ADDRESS
SCSI ID		JP5/Jumper 1	JP5/Jumper 2	JP5/Jumper 3
	0	open	open	open
	1	closed	open	open
	2	open	closed	open
	3	closed	closed	open
	4	open	open	closed
	5	closed	open	closed
	6	open	closed	closed
»	7	closed	closed	closed

USER CONFIGURABLE SETTINGS
Function		Location	Setting
»	Not used	JP2	N/A
»	Provides a protocol compatible with ACB-5500 and ACB-4000 families of controllers (4525S4000 only)	JP5/jumper 4	closed
	Does not allow for compatibility with ACB-5500 and ACB-4000 controllers (4525S4000 only)	JP5/jumper 4	open
»	Zero latency default enabled (4525Z only)	JP5/jumper 4	closed
	Zero latency default disabled (4525Z only)	JP5/jumper 4	open
»	Spindle motor starts on command	JP5/jumper 5	closed
	Spindle motor starts on power-up	JP5/jumper 5	open
»	SCSI unit attention disabled	JP5/jumper 6	closed
	SCSI unit attention enabled	JP5/jumper 6	open
»	SCSI parity check enabled	JP5/jumper 7	closed
	SCSI parity check disabled	JP5/jumper 7	open
»	Normal operation	JP5/jumper 8	open
	Self-diagnostic enabled	JP5/jumper 8	closed

MISCELLANEOUS TECHNICAL NOTES

The function of JP1 is to determine the select technique used to interface the host adapter. Soldering Pin-2 to Pin "P" allows for the "pulse" select that is used by controllers designed to work with SCSI hosts. Soldering Pin-2 to Pin "H" or "L" allows for the "handshake" or "level" select signal used in accordance with SCSI standards. Unit attention (JP5/6) is not supported if the JP5/4 jumper is installed on the ACB-4525S4000.