Commodore A 2091-40 - Page 69

Technical Specifications D-1
Appendix D: Technical Specifications
A2091 Hard Disk Controller Card
sockets for 2 MB of fast RAM
CMOS 256K x 4 DRAMs 120 ns or faster
RAM can be installed as 512K, 1MB or 2MB.
Autoboot ROMs 16 kilobytes
SCSI Interface
ANSI X3T9.2 compatible
DB-25 SCSI connector
50-pin internal SCSI connector
Host Interface connects to 100 pin connector on the Amiga
Power reguirements
+5V @ 1A, +12V © OA, 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
A2091-40 SCSI Hard Disk (Quantum ProDrive 40S)
Formatted storage capacity of 42 megabytes
19 msec average seek time
Autopark
2.0 megabytes/second asynchronous data transfer rate
Full disconnect/arbitrate/reconnect ability
64K-byte look ahead DisCache
48 bit cyclic Error Correction Code (ECC) with 11-bit burst correction capability
Automatic retry for disk read errors
Read/Write with 1:1 interleave
Power requirements
+5V at 0.5A idle, 0.6A seeking, 0.65A max
+12V at 0.5A idle, 0.8A seeking, 1.6A max
8 watts average power consumption, 10.5 watts max
Industry-standard (ANSI) SCSI host interface, CCS Rev 4B
Hard Disk Geometry
3 Read/Write heads
834 data cylinders
2 data zones:
outer zone: 590 cylinders, 35 sectors/track
inner zone: 244 cylinders, 28 Sectors/track