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Downtown Doug Brown
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Revisiting programmable Mac ROM SIMMs in Quadras
https://www.downtowndougbrown.com/2023/09/revisiting-programmable-mac-rom-simms-in-quadras/
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TL;DR: The pinout of modern programmable Mac ROM SIMMs needs to be changed for correct operation in Quadras. If you’re interested in how I reached that conclusion, or at least want to see some cool pictures, read on below.