M200 interfacing

From: Fred Cisin <cisin_at_xenosoft.com>
Date: Sun Dec 29 13:06:36 2002

On Sun, 29 Dec 2002, Sellam Ismail wrote:
> And I forgot to mention the really funky codes that combine two of the 12,
> 11, 0 zones and multiple rows to form special characters (like 12-0-1-8-9
> for NUL in standard IBM EBCDIC).

And don't forget the silliness of punching graphic images on cards. I was
showing punch cards to my OS class, including portapunch (right after a
certain Florida election). I wanted to show them some of the variations,
such as round-hole and other sizes (there are some great stories about
some of those!), and the only example of the half sized card that I had
was punched with holes making a picture of a hand giving the finger.

Why not just read two columns, each of which is twelve bits, pass that as
three bytes of raw binary, and then decode in the host machine?

Grumpy Ol' Fred        cisin_at_xenosoft.com
Received on Sun Dec 29 2002 - 13:06:36 GMT

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:34:41 BST