ID some core memory

[william degnan]

>
>
> >
> >> Bill said
> >>> Just curious...can anyone id the system that used these two types of
> core
> >>> memory?  I am thinking the first is a hand-made custom core, but the
> 2nd
> >> is
> >>> definitely from a commercial system.  Looks kind of IBM-ish but it's
> >>> nothing I can ID.  It's not an IBM 1401 I don't think.
> >>> http://vintagecomputer.net/core-memory/
> >>> Thanks
> >>> Bill
> >>
> >> It's not a 1401 core plane. Here are a couple of pictures of what (I am
> >> pretty sure) is a 1401 core plane that I have from my dad:
> >>    http://web.aanet.com.au/~malikoff/ibm/IBM_1401_core_memory_
> plane_1.jpg
> >> Close-up. Has a sharp molded corner and the grooves for the wires:
> >>    http://web.aanet.com.au/~malikoff/ibm/IBM_1401_core_memory_
> plane_2.jpg
> >>
> >> Refer to PDF page 12 of http://www.bitsavers.org/pdf/
> >> ibm/1401/A24-1403-5_1401_Reference_Apr62.pdf
> >> for another photo of this.
> >>
> >> Steve.
> >>
> >>
>


I think given the IBM-esque printed markings all types of IBM core should
be ruled out first.  For example the IBM 1620.  But now you can see why I
am asking, what I have does not quite fit.

On the wirewrap side there are four numbered grids on 4 physical plates,
wired together.    The ...'s represent "the continuation of wirewrap rows"
1,2,3,4,5,...33 etc.

1  [wirewrap]         ---    133 [wirewrap]  67     1
....                                  ....                     ....    ..
33                                 165                   99     32
                                                                       33


                                                                    34
34 [wirewrap]         ---   166  [wirewrap]  100  35
..                                     ...                      ...     ...
                                                                ...     66
66                                 198                    132