DMA SCSI and XT IDE controller

• Western Digital 33C93
• both SCSI and XT IDE mode can work simultaneously
• autoboot ROM – autobooting requires at least Kickstart 1.3
• autoboot disable switch
• time-out switch for drives which spin up slower than 30 seconds
• RDB compatible
• 50 pin internal SCSI header
• internal 40 pin XT IDE header (8 bit only)
• DB25 external SCSI connector
• supported by Linux
• A-Max II driver (scsi.amhd)

memory

• sixteen DIP sockets accept 0.5, 1 or 2 MB RAM
• needs 256k×4 DIPs, 120 ns or faster

notes

• place for a 3.5″ hard disk inside the case
• hard disk activity LED – it can be toggled by jumper to show SCSI or XT-IDE activity
• connects to the side expansion port, no passthrough connector
• external power supply – turns on automatically when the A500 is powered up

DIP switch settings