This post describes how I repaired an A501 Trapdoor memory expansion. I explain how to diagnose the error and some tricks how this can be done with just an Amiga 500. The symptoms are that the Amiga does not boot and indicates a yellow screen.
The batteries used for the backup voltage for the real time clocks and SRAM settings in vintage computers are a real nuisance today. These were used in nearly all personal computers back in the 80s and beginning of the 90s and every single one started to leak and damage the PCB of the surrounding system. In the Amiga 500 they are used for the clock on trapdoor memory expansions. If you have one with such an ancient battery, it should be removed immediately. Here I describe, how a standard CR2032 coin cell holder can be fitted in place of the old battery to keep the clock running. Continue reading Changing the battery on a memory expanstion to a CR2032 battery
This Blog will document some of my Electronic Projects I am working on or have finished. I am mainly interested in creating new hardware for vintage computers to improve the fun and usability.