does any read punch cards anymore?

Ethan Dicks ethan.dicks at
Thu Aug 25 15:12:32 CDT 2005

On 8/25/05, Brad Parker <brad at> wrote:
> Remember punchcards?

> Does anyone read them these days?

Not me.
> I'm just curious if anyone does, and if they do, how they do it.

I started to write an app in C that could take a medium-res scan of a
punch card (from a fax scanner I have) and "OCR" it, but I kinda lost
interest after I got it as far as locating the edges of the card
within the scan image.  I never wrote any code to look for holes.

For volume production, I think it's well worth maintaining a tabletop
card reader.  They are somewhat rare, but once you have one working,
it's just as easy to read 2000 cards as to read 20.


More information about the cctech mailing list