ST506/412 or SCSI controller

• A.L.F. 2 is a general hard disk driver software with 16 different hardware versions based on it
• supports processor cards and does some optimizations for the better processors
• handles drives up to 1 GB only
• Model 1:
  • only ST506/412, either MFM or RLL
  • cannot autoboot – by making the driver reset resistent, rebooting off hard disk is possible
  • the Zorro II version is half length (only a Zorro – XT adaptor board), the metal hard disk mounting frame is optional
• Model 2:
  • ST506/412 (either MFM or RLL) or SCSI
  • autoboot ROM – autobooting requires at least Kickstart 1.3
  • the Zorro II version is full length and has place for mounting a 3.5″ hard disk
• if a Model 1 and a Model 2 controller are installed in one Amiga at once, the Model 2 controls the Model 1 (autobooting is possible on both controllers)
• the 16 versions of A.L.F. 2:
  • A2000 MFM – Model 1 & 2
  • A2000 RLL – Model 1 & 2
  • A2000 SCSI – only Model 2
  • A500 MFM (without casing) – only Model 1
  • A500 MFM (with casing) – Model 1 & 2
  • A500 RLL (without casing) – only Model 1
  • A500 RLL (with casing) – Model 1 & 2
  • A500 SCSI (with casing) – only Model 2
  • A1000 MFM (without casing) – only Model 1
  • A1000 MFM (with casing) – only Model 1
  • A1000 RLL (without casing) – only Model 1
  • A1000 RLL (with casing) – only Model 1
• the A500 and A1000 versions connect to the side expansion port
• those without case have no passthrough connector, the others have

drivers & installation
firmware