Wang 300 Calc
cclist at sydex.com
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
> http://www.ljw.me.uk/ibm360/photos/ 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
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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