Wang 300 Calc

Chuck Guzis cclist at
Wed Sep 5 02:02:40 CDT 2007

On 5 Sep 2007 at 7:39, Lawrence Wilkinson wrote:

> Totally unrelated to the topic at hand, but see
> for an example of a "CCROS" card.

There was a book in the 60's about user microprogramming various 
S/360 mainframes and their cousins.  IIRC, the 360/30 was a great 
candidate because of the easily-created ROS.  The Model 40 wasn't as 
good a candidate because it used magnetic technology (core of some 
kind?) ROS.

The Spectra 70 was another great candidate for user microprogramming, 
but I don't recall the technology used for the microprogram memeory.

The CDC Star-1B used "paper' ROS for its microcode.  IIRC, crashes 
because of errors were very common.


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