Vintage Amiga SCSI Controller A2091 Hard Disk Drive Expansion Board Untested For Sale
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Vintage Amiga SCSI Controller A2091 Hard Disk Drive Expansion Board Untested:
$35.00
Untested Amiga 2000, 3000, 4000 SCSI Hard Drive Internal Expansion Card A2091
YOU GET:
- Amiga expansion card A2091
- This board has been untested and therefore being sold AS-IS
- The board physically appears to be in great condition.
- Connectors appear in great condition NO corrosion.
- Jumper pins are in great condition.
- See pictures for details
- Western Digital 33C93
- uses the same DMAC custom chip for DMA transfers as the A3000
- knows the Rigid Disk Block and SCSI Direct protocols
- built in XT IDE (8 bit) hard disk controller - the connectors and LED are not installed but their place is visible on the card
- 50 pin internal SCSI header
- DB25 external connector
- a 3.5\" hard disk can be mounted on the card
- 16 kB autoboot ROM (can be disabled) - autobooting requires at least Kickstart 1.3
- revision 7.0 of the ROM is necessary for 68040 machines
- supports SCSI network sharing
- supported by Linux, NetBSD and OpenBSD
- A-Max II driver DIP sockets accept 0.5, 1 or 2 MB RAM
- supports 256k×4 (44256) chips, 120 ns or faster
- cannot use DMA to transfer data to 32 bit fast RAM
- if Zorro II DMA memory is not available the driver falls back to programmed I/O transfers
- performs extremely slow in the A4000 because of the above mentioned two problems
