[144845] in North American Network Operators' Group
Re: wet-behind-the-ears whippersnapper seeking advice on building a
daemon@ATHENA.MIT.EDU (Michael Painter)
Tue Sep 20 06:30:52 2011
From: "Michael Painter" <tvhawaii@shaka.com>
To: "Randy Bush" <randy@psg.com>,
"Henry Yen" <henry@AegisInfoSys.com>
Date: Tue, 20 Sep 2011 00:29:11 -1000
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Randy Bush wrote:
>>> http://ibm-1401.info/
>> A few (dozen) years ago, I was treated to a interesting demonstration
>> where a coworker poured an oily fluid containing tiny metallic flakes
>> on a patch of tape. The "bits" on the tape could be clearly seen by
>> the naked eye, and could be decoded (ever so slowly!) using a
>> magnifying glass.
>
> standard ops procedure on those old tapes
>
> randy
Yep. The method I was taught (IBM) was to loop the tape into the 'developing' solution container and see-saw it back and
forth to make sure the mag. particles were distributed.
Pull it out and wait until the medium evaporated. Lay it down and carefully place 'scotch-tape' over the record. Pull
the scotch tape up and re-tape it to a white, blank, "punched card".
I still have the adjustable magnifier with the bit areas marked on the reticle.
--Michael
