Punched card readers

Thinking a little more broadly might provide a larger solution set. Computers weren't the only devices that used punched cards. A good number of late '60's to early '70's-era programmable electronic calculators used punched cards for easy loading of programs into the calculator's memory. Most of these were fairly low-volume devices, but, the mechanisms might be adapted for automatic feeding. The devices were designed to be small, desktop units that could easily fit on a desktop with a calculator. Vendors that made calculators that used such technology were Compucorp/Monroe and Hewlett-Packard. The Compucorp/Monroe CR-01 card reader does have a motorized drive to run the cards through the reading station. Some minor modifications may be necessary to match logic levels and clocking schemes, but it's a good start, and may be more common than finding vintage computer punched card handlers. You can see an example of the CR-01 in the exhibit for the Monroe 1665 electronic calculator at my "Old Calculator Web Museum" at http://www.geocities.com/oldcalculators/monroe1665.html Rick Bensene The Old Calculator Web Museum