ROM Adapter Board

[Michael Holley]

I have made several ROM replacement sockets for the masked programmed 
Motorola 6800 MIKBUG ROM used in the SWTPC 6800 system. The MCM6830 ROM does 
not have a EPROM equivalent. The replacement board has a 74LS20 (to map the 
4 enables) and a 2716 EPROM.

The challenge was to find pins that could be soldered into the ROM board 
that would plug into the existing socket on the CPU board. I bought several 
types of pins and headers from surplus stores and Digi-Key. I have 
determined that capacitor leads are the best solution. Many capacitor lead 
are made of steel and are much stiffer than resistor leads. The ones I get 
from 0.1 uf bypass caps are just the right size for machine tooled sockets. 
I can make a lower profile adapter then if I use header pins.

I describe the process (with pictures) in the Users Guide on this page.
http://www.swtpc.com/mholley/ROM_Emulator/ROM_Index.htm

Michael Holley