IBM 1620

[Jon Elson]

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
>
> http://www.angelfire.com/oh3/ebjoew/IBM_1620_Core_Memory.html
>
>
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.

Jon