> If use on solderless breadboards is not important a compact 
> PCB (4x20) would be my preference.
> 

Right, all those pins down the edge makes the PCB pretty big.

Another direction is to both reduce the pins and make use of the board space
by moving standard items like clock, power regulation and signal
conditioning onto the PCB and not bringing them out to the breadboard.

Another possibility is two rows on one edge and two on the opposite edge.
Then if you want to use it with a solderless breadboard, you put in the RA
SIL's on either side as I suggested along the one edge and use an IDC cable
to DIP adapter on the other. Works best if the high speed lines are on the
one edge.

---
James.
 

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