Here is the first photo taken of the 8MB interface coco-3 board. It has been powered-up and seems fully functional. Since this pix was taken, the rest of the board has been stuffed and has been tested. This board will use any 4MB SIMMs that are 30-pin type. SIMM speed does not matter. I am using 3-chip on the hand-wired prototype at 70ns (I think).

What you see:
Large chip in middle is the Lattice CPLD (CMOS), it controls most everything on this board. Auto-Refreshing of the SIMMs, 4MHz and LED for visual, address decoding for the serial and parallel chips, $FFD9 detection and driving another LED, and of course the 8MB interface. This board acts just like any 2MB interface and no changes are required to use NitrOS-9 or OS9 software. See the "Detail" page for more info on how it works.

This page updated: 1999/11/23