Just verified a new option rom module design. Adapts a 28C256 SOIC to a Model 100/102/200 option rom socket.
Allows re-programming the eeprom after the chip has been soldered to the module. A pullup resistor and a jumper on-board allows enabling/disabling WE on the eeprom as needed. There is a special programming adapter to make it convenient to re-program after soldering the chip, but there's a problem with that, so at the moment you can still program (re-program) using a dip28 test clip and manually arranging 28 jumper wires. Not the most convenient but functional. This is essentially the same as "ROMBO" or "MOMBO", but now it's an open source design up on oshpark and anyone can get one whenever they want. Home/self assembly isn't too bad. You don't need anything but the parts and a plain soldering pencil and some flux and solder. The soic chip was simple using the "drag technique". It's simple, just search "solder drag technique" on youtube. The trick is just the extra flux pooled around for surface tension. https://oshpark.com/shared_projects/4dLqXOs0 https://goo.gl/photos/Zs8ZnmDco9BwgDDBA -- bkw
