guesser wrote: ↑
Sat Aug 29, 2020 8:36 pm
That's a metal to diffusion via with a couple of gates around it like the connections to the bus from the output of the ROM I finished tracing out last night.
Ah yes, it's obvious now I look at it again. I've been staring at this too long.
The diffusion silicon is presumably connected off to gnd somewhere off the image is it?
This is because I decided to go tracing those "extra two" bus lines -- bits 8 and 9 -- which the Seventh-Day True Microcontroller Believers
are calling the page bits.
I have this so far (in blue-green). The blown-up region I posted is the eastern end of one page line, which is presumably gated by something:
https://drive.google.com/file/d/1ty6FJe ... sp=sharing
It isn't terribly interesting, although notable that these bits terminate up in the top-left in a similar fashion to the other 8 bits. Makes me wonder if perhaps I was wrong about them hooking up to the input pads.
I'll export the paths in a minute so others can do whatever they want with them.
scarybeasts wrote: ↑
Sat Aug 29, 2020 8:33 pm
Anyone have any objections to seeing if I can reach a bored retro chip expert via Twitter (with links to some of the resources on this thread)?
I have no objections. Apart from brainlessly tracing wires, I feel like pretty much 100% of my theories and suggestions in this thread have turned out to be completely worthless.