Have a slice of a core memory module here. ... somewhere.
Of course took drafting and electronics in high school as well as wood shop.
First computer I used was an IBM 1130. Learned how to build a machine
language initial boot card where the 12 hole positions in a column could
give me 80 short instructions from which I could build a few 16 bit
instructions and yank in the remainder of the cards in the stack. And
program by hand with the front panel switches. But also rewrote the
keyboard and rotate/tilt code for the Selectric printer as interrupt
driven.
Much easier these days.
73, tom w7sua
On 4/26/2021 2:33 PM, Mark Musick wrote:
OK, I can't resist any longer either.
I waited and bought the HP-45 when it came out. It had hyperbolic functions as
well as polar to rectangular conversion functions. Being a EE the polar to
rectangular conversion is why I bought it. It made life much easier. Of course
my dad had a fit when he found out what I paid for it.
Now to the computers, how many of you youngsters out there remember core
memory? For you really young folks there was no RAM. 0s and 1s were stored on
toroidal cores on a back plane.
IN 1978, when I started at Public Service Company of Indiana (PSI), the local
electric utility, we were using two 16 bit MODCOMP minicomputers. Each
minicomputer had 64K of core memory for the supervisory control and data
acquisition (SCADA) system. Each machine had a tape drive and two 360k disk
drives. We thought we were downtown. The SCADA system was used to control and
monitor the HV transmission system. 69kV - 765kV.
73,
Mark, WB9CIF
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