Soo, the project has been dead for about… well 2.5 years now 😯
I recently got the time and reason to continue, as a i have an EE course called “Advanced MicroProcessors” where we have to do a project and want to use the display.
I scrap’ed the idea of revers-engineering the controller board and jumped straight to the protocol between the controller and the daisy-chained LED driver boards.
Preliminary continuity tests between the bus and component on the board gave me an idea about the pinout of the connector.
Poking around with my Logic16 gave my some understanding as well, but not much.
After this i threw in som single wires (i forgot the term) in the connection. (all hail AliExpress for saving me the work of doing these plugs by hand!)
Soo. First update goes:
k-ww tipped me off how to read the am27c256 EPROM chip on the controller and this post is about my try to this exact thing.
To read it i need a MCU with 15 adress lines and 8 data lines. For this i used a Atmel ATmega32 and my STK500 board.
Hooked-up it looks like this:
I got a lot of help on this project at in the “general talk” part of the HaD-forum an realized it would fit in here more.
The first thread: http://forums.hackaday.com/viewtopic.php?f=2&t=2319
And i pic of the project in question:
I have two goals in this project
1. Reverse engineer the controller board
2. Make a new controller board
(3. Learn 😉 )
Any input and questions are appreciated!
I’ll post below:
(NB! This project was moved from the old HaD forums, as they moved on to hackaday.io and I didn’t want to follow)