Breaking News
Blog

Running around in ever-decreasing circles…

Clive Maxfield
6/23/2011 08:14 PM EDT

 4 comments   post a comment
NO RATINGS
View Comments: Newest First | Oldest First | Threaded View
Max The Magnificent
User Rank
Blogger
re: Running around in ever-decreasing circles…
Max The Magnificent   6/24/2011 3:26:38 PM
NO RATINGS
Oh, I see, you're suggesting building a simple one of these -- that would be cool -- I have a pile of un-punched cards in my office :-)

KarlS
User Rank
Rookie
re: Running around in ever-decreasing circles…
KarlS   6/24/2011 2:59:54 PM
NO RATINGS
Read the last line of the email, Magnificent One.

Max The Magnificent
User Rank
Blogger
re: Running around in ever-decreasing circles…
Max The Magnificent   6/24/2011 1:56:42 PM
NO RATINGS
Thanks for your reply -- but the actual question was whether there were any posters or educational games that could be used to explain this stuff to kids...

KarlS
User Rank
Rookie
re: Running around in ever-decreasing circles…
KarlS   6/24/2011 1:54:11 PM
NO RATINGS
"how punched cards were used" The first use was in tabulating the census of 1910, I think that was the year. They were invented by James(?) Hollerith. I am looking at a punched card right now. The card was divided into rows and columns. There were 80 columns and I think 12 rows, the top 3 rows were called zones and indicated how the remaining rows were encoded. Each column could be a letter(A - Z) or decimal number/(0 - 9). There are 26 letters so each zone punch along with one of the lower 9 was one of 9 letters -- 3 zones times one of 9 lower rows covered the 26 letters. I think this is accurate, no punch was zero and a punch in a lower row was 1 - 8. The cards were read by having a spring loaded contact that would fall through the hole so that whichever made contact that would be the meaning of the punched hole.

Flash Poll
Radio
LATEST ARCHIVED BROADCAST
Join our online Radio Show on Friday 11th July starting at 2:00pm Eastern, when EETimes editor of all things fun and interesting, Max Maxfield, and embedded systems expert, Jack Ganssle, will debate as to just what is, and is not, and embedded system.
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Times on Twitter
EE Times Twitter Feed
Top Comments of the Week