Rebuilt my 1702A EPROM programmer so that all those ugly "wall warts" are hidden in this case. Also built my latest revision of my Vintage EPROM reader for the Arduino.
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I have been playing around with the Arduino Mega in order to use it as an EPROM reader. My ultimate goal is to use it to check old Commodore ROMs and PLA chips to see that they are working correctly. Also, with some modifications, I hope to be able to read some old 1702A EPROM chips from the 1970s. These early EPROMs need two voltages, +5V and -9V, which makes it a bit trickier. I have to make up a special personality board for that one.
So far I have been able to read the following EPROMs: 2716, 2732, 2764, 27128, 27256, & 27512. I have a Commodore 16 and a Commodore Plus/4 that do not work. These are notorious for failing due to some of the chips overheating. I've tried getting these two to work without success thus far. Since I don't have access to a working machine to test which chips are working and which ones are not, I decided to build a test unit using an Arduino UNO to at least eliminate a few of the possibilities. This is what I came up with. It function is to test the C16 and Plus/4 PLA (Programmable Logic Array) and ROM chips. Now that the hardware piece is finished, it is time to do the coding.
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AuthorCharles Baetsen holds a Bachelor and a Master's degree in Engineering Physics from McMaster University in Hamilton, Canada. Archives
February 2024
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