repairing early HP calcs

[Chris M]

I dont own any. But according to a recent Circuit
Cellar article, early ics can be easy to implement in
a FPGA. Dont have the issue in front of me, but the
guy needed to mimic if you will a crt controller.
Therefore could the chips used in the early HPs (maybe
up to and including the 41 series?) be readily
emulated by an FPGA?

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