SDC802 Hard Disk/Floppy Controller Settings and Configuration

Card Type	Hard drive controller
Hard Drives supported	Up to 7 SCSI-1 devices
Floppy drives supported	Two 360KB, 720KB, 1.2MB, or 1.44MB drives
Data Bus	8-bit ISA
Card Size	Half-length, full-height

CONNECTIONS
Function	Location	Function	Location
25-pin SCSI connector - external	CN1	34-pin cable connector - floppy drive	CN3
50-pin SCSI connector - internal	CN2

BIOS ADDRESS SELECTION
Setting	JP1/1	JP1/2	JP1/3	JP1/4	JP1/5	JP1/6	JP1/7	JP1/8
C000h	Closed	Open	Open	Open	Open	Open	Open	Open
C400h	Open	Closed	Open	Open	Open	Open	Open	Open
C800h	Open	Open	Closed	Open	Open	Open	Open	Open
CC00h	Open	Open	Open	Closed	Open	Open	Open	Open
D000h	Open	Open	Open	Open	Closed	Open	Open	Open
D400h	Open	Open	Open	Open	Open	Closed	Open	Open
D800h	Open	Open	Open	Open	Open	Open	Closed	Open
DC00h	Open	Open	Open	Open	Open	Open	Open	Closed
Note:To disable BIOS remove chip U11 (not diagrammed).

INTERRUPT SELECTION
IRQ		JP2/1	JP2/2	JP2/3	JP2/4	JP2/5
	IRQ3	Open	Closed	Open	Open	Open
	IRQ4	Open	Open	Closed	Open	Open
	IRQ5	Open	Open	Open	Closed	Open
	IRQ7	Open	Open	Open	Open	Closed
»	IRQ9/None	Closed	Open	Open	Open	Open

WAIT STATE SELECTION
Setting		JP3/1	JP3/2
»	Normal	Closed	Open
	Zero	Open	Closed

FLOPPY INTERFACE CONFIGURATION
Setting		JP4/1	JP4/2
»	Enabled	Open	Closed
	Disabled	Closed	Open

FLOPPY DRIVE SPEED SELECTION
Setting		JP5/1	JP5/2
»	Single speed	Closed	Open
	Dual speed	Open	Closed

FLOPPY DRIVE PRECOMPENSATION SELECTION
Setting		JP6/1	JP6/2
»	125ns	Closed	Open
	187ns	Open	Closed

FLOPPY DRIVE STANDARD/IBM COMBO MODE SELECTION
Setting		JP7/1	JP7/2
»	IBM Combo card	Open	Closed
	Standard	Closed	Open

MISCELLANEOUS TECHNICAL NOTES

Remove terminating resistors when connecting external and internal devices at the same time.