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Acorn System 1 Replica – Part 1
Replicating the CPU board The first problem was to get hold of a schematic and make sure it was correct. On-line I found hi-resolution pictures of both sides of the two PCBs so printed them out, stuck them together and traced each track on the PCBs, comparing it with the schematic and there were a…
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Shift Registers
Shift registers are wonderful things and especially useful to the hobbyist who never seems to have enough I/O pins on the CPU/MPC they want to use. So, with a view to helping explain these misunderstood little scamps, many years ago I wrote this to help explain them, how they work and a practical example of…
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Microchip IC Package Specs.
A PDF file from Microchip detailing all the different package types they have for their products… and there are a lot of them.
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Acorn System 1 User Manual & Monitor ROM
This is a scan of the Acorn System 1 User Manual that I found a while ago in the internet. For anybody building a replica of this machine and using the official Acorn System 1 Monitor ROM, this manual is invaluable. There is also a copy of the Acorn System 1 Monitor ROM that I…