10 Apr
2015
10 Apr
'15
7:46 a.m.
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.
paul