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John,
That=92s not my recall of the IBM1130.
I remember memory cards with core memory (largest one was sixteen kilobits)=
.. If my memory does not fails me, there were two sub boards of 8 kbits, one=
 on each side.
the front panel had everything needed to boot, and to write to the memory w=
ith one switch  and one lamp per bit.
We used to play with new cards without OS. So we would enter code from the =
front panel to read from the tape reader, then we could then load the boots=
trap and the OS from perforated tape.
Pat of my final project for the Master degree was to design a real time clo=
ck for the 1130, because the one from IBM was outrageously expensive; time =
was displayed with 7 segment green fluorescent tubes, that were looking bet=
ter than old redish Nixies.
That was in the early seventies.

my $0.02,

Jean-Paul (AC9GH)


On Apr 9, 2014, at 8:29 PM, John J. McDonough <mcd@is-sixsigma.com> wrote:

> On Wed, 2014-04-09 at 21:38 +0100, Peter Onion wrote:
>> On Wed, 2014-04-09 at 11:54 -0400, John J. McDonough wrote:
>>> On Wed, 2014-04-09 at 16:10 +0100, Peter Onion wrote:
>>>=20
>>>>=20
>>>> I have written some Algol-60 in recent years !
>>>=20
>>> In recent years?  Do tell.
>>=20
>> http://www.youtube.com/watch?v=3DWa7KVU_e8U8
>=20
> The sound of the Calcomp plotter bringsback memories.   I used to use
> one on an IBM1130.
>=20
> But the computer reminds me of an incident back when I had an
> electronics specialty Explorer post.  We got a PDP/4 donated to us, and
> we were looking around inside the beast.
>=20
> My assistant advisor poked me and said, "John, look at that rack of
> cards.  I think that's the accumulator."
>=20
> Each register had its own rack of cards, one card per bit.
>=20
> --McD
>=20
>=20
> --=20
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist


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