SCSI controller

• 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 (scsi.amhd)

memory

• sixteen 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

recapped with Rubycon brand 105° type

original ROMs
drivers & installation