At 01:36 PM 1/30/98 -0600, you wrote:
On my web site, I express my hopes to develop software to help rescue
old cassette data by digitizing the tapes.  I'm still hunting for
specifications of the old formats.
I just got a box full of Altair-era cassettes on loan.  I plan to
digitize them now and rescue the data later.
 
   If you succeed, I would be interested in getting copies of some of those
old tapes for the Altair.  I hope to get the stuff to connect a tape drive
to my Altair soon.
   I have some of the specs for HP stuff. But that's probably newer than
what you're looking for.
   Joe
 - John
Jefferson Computer Museum <http://www.threedee.com/jcm>