Hand-wired core for ROM?
paulkoning at comcast.net
Fri Apr 10 09:46:15 CDT 2015
> 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?
I don’t know any. Certainly not any PDP-11; those used solid state ROMs, or in the early boot ROM cards, diode arrays.
I think some IBM 360 models used core ROM for microcode.
Another early machine — the CDC 6000 series mainframes — used a switch matrix for the boot ROM (“deadstart panel”). And the character shape data for the console display was originally implemented as a large pile of random logic, though in the 170 series it turned into a conventional ROM.
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