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Sinclair Project 60
Although I did nothing on the design of Project 60, I wrote the manual for it. I ran Sinclair's service department in those days, so if you need help, I can probably recall enough to do so!
Project 60 manual, issue 2 this is a high-resolution scan of the manual (24MB) done by and from Kio's Sinclair site, where there is a lower resolution scan also available. Issue 2 of the Project 60 manual was smaller, with glossy covers. The size was reduced to make it more compatible with the boxes used for the modules.