Hi.
The PE 'Digi-Cal calculator project ran from July 1972 to May 1973. What an interesting and educational project, and how we take LSI ICs for granted these days!
With the huge number of TTL ICs it must have cost a small fortune to build (and run)
. I can't imagine too many were built. Deserves a place in the science museum I think.
Could be a great retro project to undertake now assuming that all components can be obtained. The power supply could easily be updated so that would be a small hurdle out of the way.
Regards,
Symon