HP Classic upgrade kit - Multi Emulator (updated list of emulated models)

[teenix]

(04-02-2019 09:18 AM)albertofenini Wrote:  

(04-02-2019 08:06 AM)ijabbott Wrote:  I guess the PCB artwork is under copyright, but unless HP suddenly decide to go into the ancient calculator repair business, I can't imagine it being a problem, especially if it's for personal use.

However, copyright aside, how can be found the scheme for the middle layers without destroying
the actual PCB ?
There are at least two middle layers, one for the ground connection and one for other connections

If the inner layers are obscure then perhaps there is no destructive way to see the circuit layout, except maybe x-ray.

cheers

Tony