Here is an adapter that converts a Hitachi 63x09ECP (PLCC Package) CPU to a CoCo-3 DIP-40. It has buffers for address lines and a buffer for the R/W line. This one is corrected for the Hitachi pinout, which is NOT the same as the Motorola part! I have hand-wired a prototype using a Motorola CPU, MC68B09EFN. I have 11 each of the Motorola parts and on 1999/8/25 I tested it in a stock coco-3 and it works great! And then corrected it on 9/17/1999 and added SMD-1206 resistor pullups. As you can see, it hangs out to the right of the 6809E, IC1. It probably won't interfere with rompack, disk or serial plastic cases.

The DIP part of the board has pins that go down into where the 6809E socket is. The PLCC part of the board is on top and there's nothing under the PLCC part. If the DIP connection pins are high enough, it may clear most things inside of the CoCo-3. Pin height should be about 0.5 inches minimum so that the bottom of this board clears the electrolytic caps on the CC3 motherboard.

The buffers for address and R/W lines are between the Dip-40 pins and are SMD parts. Parts are: 74F244, 2 each and 74F08, 1 each.
This page updated 2000/01/26