HP-65 more on the card reader

[teenix]

(01-31-2019 07:33 PM)AndiGer Wrote:  The original HP Journal you can be accessed here:
http://www.hpl.hp.com/hpjournal/pdfs/Iss...974-05.pdf

The HP65 card data format is explained in the above article link on page 4.

If you try to write a bunch of NOPs to the card then Track 0 will show a square wave at the bit write frequency, while Track 1 should stay level.

I'd image Track 0 to be the WA pin.

cheers

Tony