Reply to post: Re: Paper tape anyone?

NASA dusts off FORTRAN manual, revives 20-year-old data on Ganymede

Christian Berger Silver badge

Re: Paper tape anyone?

"I wonder how many paper tape readers still exist?"

Papertape readers actually are simple enough to produce. Take a PCB, put on a row of phototransistors (either 6 or 9 depending on the number of bits per character), have a second, smaller PCB with holes and "upside down" SMT LEDs which has its edges filed down to be as smooth as possible. And place both PCBs on top of each other, with some small gap in between. You just pull though your paper tape and there you go. One phototransistor will give you the clock, the others will give you the data. Since papertypes have a dedicated row of perforation you have a clock, therefore you don't need a motor to maintain constant speed.

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