[sdiy] Mac users - excellent keyboard similar to IBM

cheater cheater cheater00social at gmail.com
Tue Jun 1 02:03:35 CEST 2021


I have no idea how that would work - I have one of those modules here
- or at least very similar, using the same switch technology. I can't
see any way to lock keys from being pressed like that... any clue how
that might have worked?

On Mon, May 31, 2021 at 8:39 PM René Schmitz <synth at schmitzbits.de> wrote:
>
>
> There were many different types of 3270 (and compatible) Terminals.
>
> However the operating system must had support for this.
>
> A quick search revealed this:
>
> http://www.columbia.edu/cu/computinghistory/3270.html
>
> "Users are generally presented with forms to fill out. The user moves
> about the form with arrow, tab, and backtab keys, filling in and
> correcting the various fields, and then presses the Enter key when ready
> to submit the form to the mainframe. The mainframe receives a series of
> data elements tagged to identify which field they belong to. When the
> mainframe is not ready for input, it literally "locks" the keyboard."
>
>
> Best,
>
>   René
>
>
> Am 31.05.2021 um 15:56 schrieb cheater cheater via Synth-diy:
> > Nope, the IBM 3270 is a beam spring keyboard. I have one here at home.
> > There is no conceivable locking mechanism. I think Rene is talking
> > about a Model A or even Model 01 converted to TTY. Those keyboards
> > used a drive shaft that propelled the keys forward, otherwise they
> > felt "stuck". If the motor wasn't on, the drive cylinder was not
> > moving, and the key wouldn't operate... but I don't know if it would
> > feel "stuck". I don't remember which of the ancient IBM typewriters
> > had a drive cylinder, but I knew half a year ago.
> >
> > On Mon, May 31, 2021 at 10:34 AM Vladimir Pantelic via Synth-diy
> > <synth-diy at synth-diy.org> wrote:
> >> On 31.05.21 10:17, René Schmitz wrote:
> >>> They look similar to the keyboards used on mainframe terminals on an IBM
> >>> System 370.
> >> yes, that's the keyboard my Mom had at work, together with an IBM 3270
> >> terminal. as a kid I was impressed that it had F1 - F12 and PF1 - PF24 :)
> >>
> >> And separate RETURN (as in next line) and ENTER (send the form to the
> >> mainframe) keys.
> >>
> >> when she had to use my PC to work from home she asked me where my ENTER
> >> (send form) key was - eventually we found out it was mapped to F3 for
> >> measly PC users...
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