I had this same idea a couple of years back. I designed (with a lot of borrowing) a pcb for a 40 pin 877. It includes regulator, crystal, rs-232, i2c seeprom, LCD connector, I/O connector, programming header, and reset switch. I have used this board in several projects by designing different I/O boards. Most of my projects have become products in the industrial automation field. I will post the schematic. I can't give the design away - so email me if your interested in this pcb.
Bookmarks