Submitted by
gareth_IIe on August 30, 2020 - 9:33pm
So the first thing I tried was swapping the RAM out and that had no effect. I then had a look at the EF ROM. Testing it wasn't too difficvult, and with the air of an Arduino and breadboard I descovered that blocks of the rom appeared blank. I read the rom a few times and the blank areas moved about. I put a PCB together with a ZIF socket and soldered the connections to make certain the blank areas weren't a loose connection. I then downloaded the rom, bought an EPROM and turned my reader into a programmer. However with the faulty rom replaced very little changed, how
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