Low cost 5101 Adapter
This Adapter is using a cheap PIC (which need to be programmed with the 'hex' file provided), a Diode and a capacitor, that's it!
The program use the internal RAM and EEPROM of the PIC. The capacitor and the Diode are necessary to give the PIC enough time to save the RAM Content to the EEPROM after switching of the pinball machine.
No backup battery needed anymore!
The Adapter does only work with Bally and Stern MPUs (in Bally compatibilty mode) produced between 1977 and 1985!
In case you do not have a PIC programmer I do recommend my own PIC programmer or a PICKIT3.
needed parts (see shop cart)
adapter, ready to go
as the diode is placed under the IC socket for the PIC, you need to start soldering with the diode
now place the capacitor
next place the adapter pins and the IC socket. Best to put the adapter pins into an old socket for exact soldering.
the adapter pins are a bit weak, so take care!
Adapter in a Bally35 MPU
Adapter in a Stern200 MPU