On 25/05/16 01:03, Paul Berger wrote:
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.
Paul
Card (paper) ones did exist! But I suspect they were only for emergency
FE use.
It may be that the mylar ones were not manual-punch friendly, so you could
make a duplicate to use while you waited for the proper spare to arrive.
There's a photo of a mylar card at http://www.ljw.me.uk/ibm360/photos/
--
Lawrence Wilkinson lawrence at ljw.me.uk
The IBM 360/30 page http://www.ljw.me.uk/ibm360
