Everything You Always Wanted To
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Amiga Technical References
Commodore A2091 SCSI
Interface
Technical Specifications
A2091 Hard Disk Interface Card
-
Sockets for 2 MB of 16-bit RAM
CMOS 256K x 4 DRAMs 120ns or faster
RAM can be installed as 512k, 1MB or 2MB
-
Autoboot ROMs 16K
-
SCSI Interface
ANSI X3T9.2 compatible
DB-25 SCSI connector
50-pin internal SCSI connector
-
Host Interface connecto to 100 pin ZorroII connector on the Amiga
-
Power requirements
-
+5V @ 1A, +12V @ 0A, No hard-drive on card
-
+5V @ 2A, +12V @ 1A, Hard drive on card max
- Maximum power consumption of card-mounted hard-drive
+5V @ 1A, +12V @ 1A continuous, 2A maximum startup
Jumper Settings:
Jumper 1: Memory Size
2 Meg
1 Meg
512k
0 k
Jumper 2: Auto: Enables Autoboot ROMs Kickstart 1.3 or higher
Dis: Disables Autoboot ROMs Kickstart 1.2
Jumper 3: Factory Use Only
Will set interupts (this is not a toy)
Jumper 5:
Option 1: OFF LUN Disabled - One drive at each address
ON LUN Enabled - Multiple drives at each address
Option 2: OFF Time-out disabled - Short wait period for
drive parity checking enabled
ON Time-out enabled - Long wait period for drive
Parity checking disabled on message-in phase
Option 4: Reserved
Jumper 201: Factory Use Only
4 PIN POWER
CONNECTOR
25-pin External
SCSI Connector
50-pin Internal
SCSI Connector
Copyright © 2000 Amiga Auckland Inc. All rights reserved.
Revised: June 16, 2005.