Commodore A2090
-Full length Zorro II Card
-Does not support autoboot (A company called Combitec did make an additional board to allow autobooting from this card)
-Also known as the A2500 Hard Disk Controller
-Known as the A2094 in rare occassions (not 2090a)
The 2094 is actually a Hard Disk kit which came with a 2090 autobooting HD
Controller, a 3.5" 40MB HD, cables, mountings, ROMs, manuals and disks.
(Thanks to Arne Lunde)
-ST506 (IBM XT MFM) Controller
-Standard SCSI controller
-Zilog 80B Processor
-In Zorro III machines, all drivers and buffers must be loaded into CHIP RAM
Commodore A2090a (The above plus...)
-Has 2 ROMS (u50 & u51) which the A2090 does not have, to allow it to autoboot, although it
uses it's own custom booting method and does not use the standard commodore
Rigid Disk Block system. In order to prep and format a hard drive, you require a
special prepping utility. NB. Some boards were actually sold without the ROMs but
can be upgraded
-You can not have partitions larger than 256MB without a patch. Probably applies
to the A2090 also.
-You need at list Kickstart 1.3 to autoboot
Board# Physical Size Revision Number ----------------------------------------------------------- U50 HI Top centre, below J2 28 pin 315098-01 2090 AB5C U51 LO Top centre, below U50 28 pin 315097-01 2090 D32B U36 Top right 28 pin 390230-09 2090a 2FEF Connector/Jumper Description ------------------------------------------------------------ J0 34pin ST506 Control Connector J1 20pin ST506 Data Cable Connector 1 J2 20pin ST506 Data Cable Connector 2 J4 2pin SCSI LED Connector for A2090 J4 2pin Autoboot ON/OFF for A2090a J5 LED Connector CN1 DB25F SCSI Connector CN2 50pin SCSI Connector ***PLEASE NOTE THAT SOME PARTITIONS MUST HAVE THE FOLLOWING NAMES*** Physical Device | 2 Cylinder Section | Unit | First Partition -----------------+--------------------+------+---------------- 1st ST506 Drive | RES0: | 1 | DH0: 2nd ST506 Drive | RES1: | 2 | DH1: 1st SCSI Drive | RES2: | 3 | DH2: 2nd SCSI Drive | RES3: | 4 | DH3: 3rd SCSI Drive | RES4: | 5 | DH4: 4th SCSI Drive | RES5: | 6 | DH5: xth SCSI Drive | RES(x+1): | (x+2)| DH(x+1):
Thanks to Calum Tsang.