Apple //GS Mega // chip

Does anyone here know where I can get a Mega // chip (with, hopefully, a pin-out) without having to cannibalize an Apple // GS motherboard? I’ve been contemplating a project for years, and still no easy solution.

The pinout is relatively easy: it’s in the circuit diagram.

I think the diagram was originally part of the hardware reference manual
(see also here)

But to get a chip, I think someone somewhere needs to take it out of a IIgs. Preferably a dead one! (Or else someone needs to make an FPGA recreation, which would be technically possible but probably rather difficult to get exactly right.)

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You might try here:
https://www.arcadecomponents.com/customroms.html

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Thanks for the manuals. It seems like either way won’t be easy.

Thanks for the link. I left a message, and hopefully they’ll be able to help me out.