Close
0%
0%

EEPROM writer for AT28C256 using Arduino Mega

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

andre-baptistaAndre Baptista
Following
Liked Like project

Just one more thing

To make the experience fit your profile, pick a username and tell us what interests you.

Pick an awesome username
hackaday.io/
Your profile's URL: hackaday.io/username. Max 25 alphanumeric characters.
Pick a few interests
Projects that share your interests
People that share your interests

We found and based on your interests.

Choose more interests.

OK, I'm done! Skip
Similar projects worth following
2.7k views
4 comments
18 followers
View Gallery
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

Enjoy this project?

Share

Discussions

mitchgollub wrote 10/22/2020 at 12:37 • point

Has anyone gotten this to work?  I hooked up my Mega to match the sketch and the picture, but I'm still unable to write to the memory of my AT28C256 chip.

  Are you sure? yes | no

jamesaharrisonuk wrote 12/27/2019 at 05:34 • point

Do you have a schematic? I've guestimated wire up by looking at the pictures, but its not working. The Sketch code uses 16 (0-15) address lines, but the AT28C256 only has 15 (A0-A14 and there is no A15). Where does the extra address line hook up to. Ive changed the sketch to ADDRESS_BUS_SIZE variable to 14.

  Are you sure? yes | no

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!

  Are you sure? yes | no

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

  Are you sure? yes | no

Does this project spark your interest?

Become a member to follow this project and never miss any updates

By using our website and services, you expressly agree to the placement of our performance, functionality, and advertising cookies. Learn More

Yes, delete it Cancel

Report project as inappropriate

You are about to report the project "EEPROM writer for AT28C256 using Arduino Mega", please tell us the reason.

Send message

Your application has been submitted.

Remove Member

Are you sure you want to remove yourself as a member for this project?

Project owner will be notified upon removal.