[OPLINTECH] Such a deal ! Disquettes 90mm

[Mann, James H.]

You opened the case on early Macs with a t4 GM headlight adjusting tool--which was a 24" screw driver to get to the 2 hidden screws and a flattened wood working clamp or large paper clip to actually crack the case. Real professionals could give the sides of the case a karate chop and get it open but that was an advanced skill.
________________________________________
From: oplintech-bounces at lists.oplin.org [oplintech-bounces at lists.oplin.org] On Behalf Of Ron Dalpiaz [dalpiaro at oplin.org]
Sent: Friday, April 15, 2011 3:07 PM
To: Bob Neeper
Cc: oplintech at lists.oplin.org
Subject: Re: [OPLINTECH] Such a deal ! Disquettes 90mm

Exactly!

Taken from: http://c2.com/cgi/wiki?HollerithPunchCard

"When I used these cards for programs, the output decks did not have
anything written on them. This was a problem if 2000 card program deck was
dropped on the floor. The solution was to draw a diagonal line across the
top of the new deck using a felt tipped pen. This gave a means of ordering
the cards if they became out of order. Often, this was the program, i.e.
there was no copy on disk."


----- Original Message -----
From: "Bob Neeper" <neeperro at oplin.org>
Cc: <oplintech at lists.oplin.org>
Sent: Friday, April 15, 2011 2:54 PM
Subject: Re: [OPLINTECH] Such a deal ! Disquettes 90mm


> I think you would put an X on the top (edge) so when you dropped them all
could
> could get them back in order.
>
> R. W. (Bob) Neeper
> Community Library
> 44 Burrer Dr.
> Sunbury, Oh 43074
> Tel:  (740)-965-3901
>
>
> On 4/15/2011 2:38 PM, Nathan Eady wrote:
> > "Mann, James H."<JMann at gcpl.lib.oh.us>  writes:
> >
> >> Here's some punch card trivia for us old guys...why did you use a
> >> marker or crayon to scribe an X on the top of your punch cards?
> > Because a pencil or especially a ballpoint pen would probably leave an
> > indentation, and if all your cards have those indentations they won't
> > stack right in the card reader?
> >
> > I'm guessing.  I've never seen punch cards in actual use except as a
> > visual aid in a computer history class.
> >
> >> OK, here's some old Mac trivia...when upgrading a Mac Plus why did you
> >> have to cut the green wire?
> > Probably because there was physically no other way to get the case open,
> > but again I'm guessing.  I *have* used a Mac Plus, but I didn't own it
> > and so was never in a position to upgrade it.
> >
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