IBM 1620

Jon Elson elson at
Mon Aug 31 10:37:19 CDT 2015

On 08/31/2015 02:59 AM, Dave G4UGM wrote:
> I seem to remember that 1620 core runs warm, and you have to wait for it to
> get warm before the machine comes on-line ... see last paragraph
Yes, many IBM machines used heaters to stabilize the core 
temperature.  The 360/40 and 360/50 had heaters for the 
local store (register stack).  Not sure about the 360/30 
where local and main store were all in the same unit.  Not 
sure if the higher machines also heated the main store.


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