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Fulcrum   - Omnidisk FDC Board

This was not an IMSAI board but a board designed and produced by Fulcrum themselves.

Omnidisk FDC

The board could support 5" and 8" floppy disks.  It had 24-bit DMA addressing capability. it had an onboard PROM for power on boot.  There was onboard RAM for sector de-blocking to conserve valuable RAM space above the BIOS.  There was an interface for a Western Digital 1001 hard disk controller as well. The board had full 16-bit port addressing. The board had its own onboard 4MHz 8085 CPU.

Full track buffers allowed the controller to recall entire tracks, not just sectors. This gave great speed increases (typically 3-7X other systems).

The manual for this interesting looking board can be obtained here

A Z80 BIOS and related software can be obtained here


Other Fulcrum  S-100 Boards
64K Static RAM      256K Static RAM      VIO Video Board     Omnidisk FDC


This page was last modified on 10/25/2013