A2091 Disk Controller
Disk controller, 1989, Commodore. The A2091 is Commodore's DMA SCSI controller for the Zorro II slot, introduced with the later Amiga 2000HD and 2500: a Western Digital 33C93 SCSI chip with DMA, sockets for up to 2 MB of fast RAM, autoboot ROMs and space to mount a 3.5 inch hard disk on the card. It is also found in many Amiga 4000, where it is slow because it cannot use DMA to 32 bit memory.
| Years | 1989 to 1992 |
|---|---|
| Manufacturer | Commodore International |
| Compatibility | Amiga 2000, 2500, 3000, 4000 (Zorro II slot) |
| Controller | Western Digital WD33C93 SCSI with DMA; unused XT-IDE port on the board |
| Connectors | internal 50 pin SCSI, external DB-25 SCSI |
| RAM | sockets for 512 KB, 1 MB or 2 MB of 16 bit fast RAM (44C256 DRAM) |
| Autoboot | ROM version 6.6 or 7.0 recommended (7.0 needed for 68040 machines); third-party GuruROM available |
| Interface | Zorro II, full length, hard disk mounting on the card |
Documentation
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