[squeak-dev] for the operation MAP := B bitOr:( M bitShift:3) given MAP how do I derive B and M?

David T. Lewis lewis at mail.msen.com
Thu Feb 13 16:31:35 UTC 2014


Of course we have Bob Arnings' wonderful punched card morph at
http://www.squeaksource.com/PunchedCards, so it sounds like we are going
to need an enhancement to provide a ChadMorph and and ScotchTapeMorph now.

Dave

>
>
>> Jecel Assumpcao Jr.
>>
>> Tim Rowledge observed:
>> > Which is all well and good until you run out of 1's, like we sometimes
>> > used to when I was a young'un trudging to school barefoot in the snow,
>> > uphill both ways.
>>
>> Ron Teitelbaum exclaimed:
>> > You had FEET?
>>
>> Eliot Miranda clarified:
>> > yes, but there was only the one pair to share between all 17
>> > siblings...
>>
>> You guys are being silly, but when I was in the first year of the
> university I
>> actualy kept a bag full of 1s. The computer was a Burroughs
>> B6700 and students had to use punched cards to program it (this was
> replaced
>> with terminals the following year). While on normal days the both the
>> card
>> reader/printer room and the keypunch room were deserted, on the due
>> dates
>> for student projects the lines were Disney-level long.
>> To have a faster turn-around for small edits, I had previously collected
>> a
> bag full
>> of chad from the keypunch machine (the 1s), had typed a card with all
> characters
>> to have a reference for the codes and had a razor blade for cutting new
> holes
>> (the 0s). There was no need for tape or anything like that to keep the
> chad in the
>> covered up holes as the card went through the reader: both the hole and
> the
>> chad had rough borders and rubbing a fingernail on them on a smooth
> surface
>> would expand them slightly.
>>
>
> That's pretty funny.
>
>> -- Jecel
>> p.s: the 1s and 0s in this story are probably inverted - just apply XOR
>> 1 and it will be true
>>
>
>
>




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