* Posts by OlDave

1 post • joined 1 May 2018

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

OlDave

Re: Paper tape anyone?

The simplest way way back in the day was to use a photo transistor array and a uart. (Serial) or buffer (parallel port).

The tape was pulled through by hand through a simple set of guides to align the tape with the sensor. From memory illumination was room lighting. Might be improved with a desk lamp.

Clocking was by use of the sprocket hole which is smaller than the data holes and allowed some data skew/ set up time before data was transferred. You may have had to use your thumb to keep the tape in place.

Whole affair fitted into a small plastic/ diecast box.

Worked best with opaque black paper tape and possible variable results with white paper tape and possibly not good with oiled tape.

From memory "Pickles & Trout" made them.

Way back in the day when you bought software for your microcomputer (8080/6800) on paper tape and the thought of an ASR33 was well beyond the thought of possibility.

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