How to build an ASCII CRT terminal, circa 1967
phb.hfx at gmail.com
Wed Aug 31 10:35:00 CDT 2016
On 2016-08-31 12:15 PM, Al Kossow wrote:
> Magnetorestrictive delay lines and a charactron.
> We got one (no keyboard) a couple days ago with the manual. I'm still cleaning it up. It had something nesting in it and
> the inside has sunflower seed husks in it. It was made with plastic DIP ICs, no idea of the logic family. The keyboard
> was made by IBM, don't know what character code it produces. Pretty funky if it encodes ASCII.
Nice a selectric keyboard... It looks like it has links that operates a
microswitch for each of the bails. The bails that would get pulled when
the filter shaft comes around would depend on the tabs present on the
key interposers, so the key interposers would determine the coding of
the keyboard and it would be possible to have it generate 7 bit ASCII
code by using an appropriately "programmed" interposer under the keys.
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