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EEPROM writer for AT28C256 using Arduino Mega

Quick and dirty breadboard circuit and Arduino sketch to make possible write in the AT28C256 EEPROM

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When making my pet project JACA homebrew Computer I quickly realize that I would need some way to write in the ROM chips (for microcode and for the programs itself). Obviously I could buy an EEPROM writer but I prefer to have some fun doing my own. Besides this I was learning Arduino and it looks like a great way to acomplish this. (For this same reason pardon me if there is some shame bad programming technique.

Source code:
https://create.arduino.cc/editor/albs_br/94b6f3f5-413d-4714-80dc-836bf5b3705c/preview

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Marcel van Kervinck wrote 04/02/2018 at 10:37 point

I made one like this as well, it is a great tool for learning these chips. After a while I rebased the code on MEEPROMMER. You have to play around with the cycle times and retry-scheme to speed-up things. The code can get tricky from there. Still it is worth looking at it. https://github.com/mkeller0815/MEEPROMMER

When I got to the point of locking/unlocking ATmel EEPROMs I found some issues with that. I debugged them (there is a problem in MEEPROMMER). I got it to work, but I had a "proper" programmer shipped from China as well and never looked back. They are so much faster, easy to use, and quite cheap.

I just saw "The 8-bit Guy" just unbox exactly the programmer I'm using!

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Dylan Brophy wrote 03/10/2018 at 07:04 point

I did something like this before! Pain to do, and I only got it working once :P  Cool to see this on HaD

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