On Sep 6, 2011, at 05:39, robin wrote:
> From: "glen herrmannsfeldt" <[email protected]>
> Sent: Saturday, 3 September 2011 10:53 AM
>
>
>> As to programming, microcode is now usually considered
>> firmware, though the term is likely more recent than S/360.
>> The microcode of most S/360 models was actually hardware,
>> physical capacitors or transformers.
>
> short ferrite rods.
I find:
http://www.cs.clemson.edu/~mark/uprog.html
there were various technologies: TROS (Transformer Read Only
Storage), BCROS (Balanced Capacitor Read Only Storage), CCROS
(Card Capacitor Read Only Storage). Perhaps others? It says
that the mylar dielectric of CCROS could be punched using a
standard (029?) card punch.
-- gil
