[cctalk] Re: Computer Museum uses GreaseWeazle to help exonerate Maryland Man

[Will Cooke via cctalk]

> On 02/03/2023 8:25 AM CST Paul Koning via cctalk <cctalk@classiccmp.org> 
> wrote:


> It's puzzling that temperature would matter. Obviously, when you hit the 
> Curie temperature the data goes away, but for typical magnetic materials that 
> is in the hundreds of degrees. Does the hysteresis curve shift enough at 
> moderate temperatures (a bit over room temperature) to matter?
> 
> paul


Yes.  The thresholds shift with temperature.  Some companines (DEC?) used 
temperature-compensated amplifiers to address the issue.  IBM, on some models 
like the 1620, kept the cores at a constant (elevated) temperature.
https://en.wikipedia.org/wiki/Magnetic-core_memory#Physical_characteristics

Will

I do not think you can name many great inventions that have been made by 
married men. Nikola Tesla