16 Jun
2016
16 Jun
'16
8:55 a.m.
(Since this discussion has long ago gone off topic, I may as well continue.) On 16 June 2016 at 11:00, Lennart Sorensen via talk <talk@gtalug.org> wrote:
Who built a computer that cared about AC frequency to drive the real time clock? Never heard of anyone doing that.
My first computer, a Poly-88 8080 based system, did (I still have it). <http://www.polymorphic-computers.com/poly88.html> The transformer used for the linear power supply was tapped, rectified and clamped to feed to an interrupt pin. The interrupt routine would increment a counter in RAM which was accessible for real time calculations. -- Scott