We are a long way from the edit instruction; and I am not sure that CCROS---It was in my experience used chiefly for device addresses, which of course varied/vary from shop to shop---a µprogramming vehicle is not, I think, a good or even defensible use of words. CEs or sysprogs did indeed punch in appropriate values, 00e say, using an on-site 029 keypunch.
John Gilmore Ashland, MA 01721-1817 USA > Date: Tue, 6 Sep 2011 09:04:24 -0600 > From: [email protected] > Subject: Re: EDIT instruction > To: [email protected] > > 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
