I notice in the Burroughs Bulletin N101 Nick posted that the block diagram
on page 2 shows a core memory! Reference in the text to the "recirculation
loop" leaves no doubt. I'm curious to know if anyone has ever seen a Nixie
instrument with a core memory? Presumably they must have existed someti
> I do recall, however, that one of the Anita nixie calculators had a magnetic
> memory - a torsion delay line. It was kind of like a clock spring made out of
> stiff wire. An actuator would twist it at one end and the torsion wave would
> go round all the coils and appear at the other end some
Were the CRT calculators Busicom?
One of those was the first thing I ever programmed... Punch cards with an
instruction rate of ten per second!
I seem to recall it had a magnetostrictive coil memory, an acoustic delay line
using wire that behaves like piezo electric stuff does but with magnetis
> Were the CRT calculators Busicom?
No, one was a Singer/Frieden, the other was something else (but I don't think
it was Busicom).
> One of those was the first thing I ever programmed... Punch cards with an
> instruction rate of ten per second!
These weren't programmable, just add, subtract, m
I have a Wang Engineering calculator about 1968 with desktop keyboard and Nixie
display with electronics in a small suitcase which sat under the desk and a
printer which did spark-erosion on aluminized paper. Core plane memory allows a
program to be halted at the end of the work day when the sys
Folks,
I was recently mailed a Chronotronix V400 clock to see if I could repair
it. This is a 6 digit clock with bi-quinary B-5025 tubes and a MAX1771
power supply.
It has a blown fuse, and the IRF840 ran hot for a while (the board is
blackened). It and the the HV filter cap were replaced, a
Most MAX1771 designs are remarkably similar - whilst failure is rarae, its
generally down to a few possibilities...
- The MAX1771 failed and is keeping the FET on, which cooks it as the
current limit resistor (if used) with be ignored. This will also cook the
inductor.
- The FET fa
