27 Oct
2025
27 Oct
'25
9:37 a.m.
On Mon, 27 Oct 2025, Paul Koning wrote:
Have you tried with an ordinary switching transistor
that's readily
available? I'm surprised at that storage time, why would it need to be
that low for a machine that runs at just a couple of MHz?
The storage time is very crucial. We have tested many different switching
transistors. The point is, the PDP-8 uses needle impulses (around 30ns) to
switch a flip-flop. They just don't work with today's transistors. And
on modules like the R211/S211, they introduce a too long delay.
Christian