65/67/97//41 Home-made mag cards - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: General Forum (/forum-4.html) +--- Thread: 65/67/97//41 Home-made mag cards (/thread-18839.html) |
65/67/97//41 Home-made mag cards - Matt Agajanian - 09-17-2022 08:07 PM Hi all. Now that the magnetic card era is quite behind us, how can mag cards be made for each model? RE: 65/67/97//41 Home-made mag cards - Kostas Kritsilas - 09-18-2022 01:41 AM All of the models you named use the same card type. The HP-71 and the HP-75 (if it uses cards) are different, and much harder to make, as they have embedded timing marks/tracks due to their being pulled by hand. RE: 65/67/97//41 Home-made mag cards - blackjetrock - 09-18-2022 08:01 AM (09-18-2022 01:41 AM)Kostas Kritsilas Wrote: All of the models you named use the same card type. The HP-71 and the HP-75 (if it uses cards) are different, and much harder to make, as they have embedded timing marks/tracks due to their being pulled by hand. Has anyone made these cards? It looks like the timing tracks are recorded magnetically, is that correct? Has anyone found a source for magnetically coated card, plastic or paper? Andrew RE: 65/67/97//41 Home-made mag cards - Matt Agajanian - 09-18-2022 06:52 PM (09-18-2022 01:41 AM)Kostas Kritsilas Wrote: All of the models you named use the same card type. The HP-71 and the HP-75 (if it uses cards) are different, and much harder to make, as they have embedded timing marks/tracks due to their being pulled by hand. I see your point. I’m also curious about construction—the card stock, how to create a magnetic strip layer, its thickness, how slick the card should be for the mechanism to pull the card through, and so on. RE: 65/67/97//41 Home-made mag cards - Sylvain Cote - 09-18-2022 10:38 PM HP Journal, May 1974, HP-65 Calculator Issue. Quote:Designing a Tiny Magnetic Card Reader HP Journal, Nov 1976, HP-67/97 Calculator Issue. Quote:A Pair of Program-Compatible Personal Programmable Calculators HP Journal, March 1980, HP-41 Calculator Issue. Quote:Card Reader Offers Compatibility and Expanded Capability HP Journal, June 1983, HP-75 Portable Computer Issue. Quote:Handpulled Magnetic Card, Mass Storage System for a Portable Computer 65 Notes & PPC Journal also contains several articles on the card reader subject. These journals and others are available in the PPC Archive USB drive. |