Reading old HP-65 program cards

[Dave Frederickson]

(03-02-2021 10:47 PM)Gene Dorr Wrote:  I have had issues reading old HP-71B magnetic cards, so I am concerned about even older HP-65 cards. They might be less of a problem though, since the HP-65 card reader was motorized, and so read/write speed would be less variable.

But the 71/75 mag cards have a pre-recorded timing track so I think the data rate as recorded on the card would have minimal variation. This is why you never degauss a 71/75 mag card.