IBM 360 Model 50 information?

Paul Koning paulkoning at comcast.net
Fri Mar 29 11:51:00 CDT 2019



> On Mar 29, 2019, at 11:18 AM, Jon Elson via cctalk <cctalk at classiccmp.org> wrote:
> 
> ...
> Oh, one other issue is the 360's had no FFs.  All storage elements were transparent latches, and they generally used a 4-phase clock. 

The same is true for the CDC 6600.  Not a big surprise; a transparent latch can be made of two cross-connected gates, while a flip-flop (edge triggered) requires more stuff (four gates?).  And the 6600 uses at least four clock phases; in parts of the CPU there are additional clocks so some of the hairy parts are more like 6 or so phases.

	paul



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