Card Type	Hard drive controller card
Processor	RISC
Maximum Onboard Memory	256MB DRAM
Hard Drives supported	Fourteen Fast SCSI devices (5400-001) Fourteen Fast/Wide SCSI devices (5400-002) Fourteen Fast/Wide SCSI devices (5400-003)
Floppy drives supported	None
Data Bus	Fast/Wide SCSI (5400-001) Fast/Wide SCSI (5400-002) Fast/Wide/Differential SCSI (5400-003)
Form-factor	5.25 inch
RAID levels supported	0, 1, 0+1, 4 and 5, JBOD

CONNECTIONS
Function	Location	Function	Location
50/68-pin SCSI connector - channel 1	CN1	UART/monitor connector	CN7
50/68-pin SCSI connector - channel 0	CN2	Environmental control system - not used	CN8
68-pin SCSI connector - host channel	CN3	Battery connector	CN9
External temperature sensor and UPS signals	CN4	Power connector	CN10
Alarm - external	CN5	Fan power connector	W8
Test connector	CN6
Note: Connectors CN1 and CN2 differ on each model. See header.

DRAM CONFIGURATION
Size	Bank 0	Bank 1
4MB	(1) 1 x 36	None
8MB	(1) 1 x 36	(1) 1 x 36
8MB	(1) 2 x 36	None
16MB	(1) 2 x 36	(1) 2 x 36
16MB	(1) 4 x 36	None
32MB	(1) 4 x 36	(1) 4 x 36
32MB	(1) 8 x 36	None
64MB	(1) 8 x 36	(1) 8 x 36
64MB	(1) 16 x 36	None
128MB	(1) 16 x 36	(1) 16 x 36
128MB	(1) 32 x 36	None
256MB	(1) 32 x 36	(1) 32 x 36

MISCELLANEOUS TECHNICAL NOTES

To prevent power interruptions affecting data held in controller’s cache, it is recommended that you connect an attached battery back-up or an uninterruptible power supply. Also, terminating drive buses by installing on-board resistors is not recommended because the end drive on the bus cannot be removed during a "hot swap" without leaving the bus unterminated.