At 12:34 AM 4/21/98 -0400, Allison wrote:
>
>Ah gads you guys do it the hard way. Take a stepper from something and
>put a roller on it with a diameter such that one step will move the card
>forward one column. Then all you need is one rows worth of
>phototransistors. I forget the punched card orgainization but a parallel
>port (printer) off a PC should be enough bits.
<snippage>
>Oh the only difference with hole vs mark sense is transmittance or
>reflective sensing.
Ummm... I may wish to debate that just a tad...
Its been a rare mark sense card that I've seen to stuff 80 colums of data
in a 'standard' tab card form factor. Usually more like 36-40 to allow for
the timing marks and the nominally sloppy filling in of the infamous
'bubbles'.
-jim
---
jimw_at_agora.rdrop.com
The Computer Garage - http://www.rdrop.com/~jimw
Computer Garage Fax - (503) 646-0174
Received on Mon Apr 20 1998 - 23:55:54 BST