Making a ‘mousebites’ PCB chip replacement adapter board
Evan’s Techie-blog is looking to dump all the TMS7000 series processors’ internal mask Read-Only Memory (ROM)s encountered. Not all are so easy, especially capturing communications with external ROM chips.
I have already desoldered this ROM to read the contents, but now I want to put my own code there.
I have a way to do this, it’s called Demon Debugger. Our latest version of Demon Debugger fits where a standard 2716 would go and uses certain regions for input and output so we could just replace the external mask rom if we know what area it’s trying to read.
This is what I’m calling the ‘mousebites’ adapter. That’s the term I’ve seen for castellated pins on the side of a board, and I think it’s cute. I used the datasheet for the exact mask rom that was installed there to get all the measurements needed to line up my board so it can be soldered where the rom chip used to be.
See the entire process and more about the PCB in the post here.
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