Front panel switches - what did they do?

Paul Berger phb.hfx at
Tue May 24 18:03:21 CDT 2016

On 2016-05-24 7:44 PM, Chuck Guzis wrote:
> On 05/24/2016 02:21 PM, Paul Berger wrote:
>> The CROS cards used in a 360/30 where the same size as an 80 column
>> card on purpose so you could you a keypunch machine to program the
>> microcode.
> But I believe that the CROS cards were mylar, no?
> --Chuck
Yes mylar with copper tracks keypunch was used to cut tracks as required.


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