A4091 Reproduction

Original Commodore A4091 schematics and layout

Facts

• Fast SCSI-II (10MB/s max) controller for Amiga Computers
• One of only two Zorro-III SCSI controllers ever designed
• Full-length Zorro-III with DMA
• Designed for the Amiga 4000; works in the Amiga 3000
• Requires Super Buster 11
• Based on NCR 53C710 chip
• Reproduction based on an old board and PAL source code released as part of the Dave Haynie Archives.
• 80 components on the top; 147 components on the bottom
• Manual build time is about 7 hours per board - plus Debugging ;)
• The ReA4091 has been fully open sourced. Check out the ReA4091 GitHub project
• Two versions: ReA4091 and the shorter ReA4091 Mini to keep your ISA/PCI slots available.
• Modern Autoboot ROM (Open Source!)
  • TD64 and NSD64 support for hard disks larger than 4GB
  • Early Boot Diagnostics menu (press right mouse button during boot)
  • CDROM boot support
  • Also works on original A4091 boards