IBM 1620; was: Early Programming Books

[dave.g4ugm at gmail.com]

> -----Original Message-----
> From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of Chuck Guzis via
> cctalk
> Sent: 21 June 2021 19:43
> To: Paul Koning via cctalk <cctalk at classiccmp.org>
> Subject: Re: IBM 1620; was: Early Programming Books
> 
> On 6/21/21 10:55 AM, Paul Koning via cctalk wrote:
> >
> memory. Nobody explained why that was a real problem.
> >
> > Core memory is fairly sensitive to temperature.  In the case of the 1620,
> there is a heating system that brings the core memory box up to its operating
> temperature, which is why it takes several minutes after you turn on power
> before the machine will run.
> >
> > Possibly the fan problem meant the temperature control system was no
> longer adequate.
> 
> For some (jprobably hallucinatory) reason, I thought there was a project
> at CHM to replace the 1620 core stack with semiconductor memory.   Guess
> that never happened.
> 
> --Chuck
> 

I believe that CHM had several issues with its 1620. There was also a project to produce a new console....

https://hackaday.com/tag/ibm-1620/

Dave