Hand-wired core for ROM?

[Mattis Lind]

2015-04-10 17:32 GMT+02:00 geneb <geneb at deltasoft.com>:

> On Fri, 10 Apr 2015, Paul Koning wrote:
>
>
>>  On Apr 10, 2015, at 10:38 AM, geneb <geneb at deltasoft.com> wrote:
>>>
>>> Did the PDP14 (or any machine of that era) ever use hand-threaded (by
>>> the end user) core boards as ROM?
>>>
>>
>> Do you mean DEC machine?
>>
>>  Yes.
>
>  I don’t know any.  Certainly not any PDP-11; those used solid state ROMs,
>> or in the early boot ROM cards, diode arrays.
>>
>
What about the PDP-9 micro code memory?

http://www.ricomputermuseum.org/Home/equipment/dec-pdp-9/pdp-9-restoration/PCP-9_MC09_ROP-Memory.jpg

64 words of 36 bit memory with small transformers.

Not anything that the end user work with though.



>
>>  I want to make sure it wasn't in use before I double-down on calling
> shennanigans on "Joe" in this thread:
> http://hackaday.com/2015/04/08/restoring-a-vintage-pdp-
> 1104-computer/#comments
>
> As far as I know, machines of that era used cores that were so small the
> DEC hired master seamstresses (myth?) to make them.  It's certainly not
> something that would be done in the field by John Q. Programmer.
>
> If I'm wrong, I'll happily admit it, but it just doesn't sound reasonable.
>
> Thanks!
>
>
> g.
>
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