Know the hardware.

What we need also is a schematic of the mainboard of the Macintosh 128k, and a photo of the PCB, top and bottom side. 

I think that if I dig into the hardware I could learn more, and the development process should be a bit easier.

Unfortunately, ChatGPT can't help me find those on the Internet, so I did it by myself. It has been difficult to find them but in the end, I have found something useful.

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