[sdiy] Mac users - excellent keyboard similar to IBM

cheater cheater cheater00social at gmail.com
Tue Jun 1 13:11:26 CEST 2021


Ah, yeah, I can easily see the solenoid getting turned off.

Cheers

On Tue, Jun 1, 2021 at 12:25 PM René Schmitz <synth at schmitzbits.de> wrote:
>
> On 01.06.2021 02:03, cheater cheater wrote:
> > 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?
>
>
> I do remember that there was a click sound, so maybe it was a solenoid.
> So I searched for "3270 keyboard solenoid".
>
> Here is some talk about that:
>
> https://news.ycombinator.com/item?id=19531157
>
>
> It must have been terminals of the era of 3270/3278. Not the later
> generation that Neils keyboard is related to.
>
>
> I think I can now piece it together:
>
> You'd normally get the solenoid relaying to you that the key was
> registered, I.e. the click sound you expected was generated
>
> by the solenoid banging against the case for each key stroke. In
> addition to any sound from the key it self.
>
> When the keyboard was in the locked state, it didn't give you that
> feedback. So you had tactile feedback that was different.
>
> Giving you a the impression the keyboard was "jammed", due to the lack
> of sound. But you could still press them after all.
>
> Any mechanics to accomplish this would be overkill for such a purpose.
> (Not that that has never stopped the manufacturers...)
>
>
> This was mostly a "alert the operator" thing, so it wouldn't really need
> you to prevent pushing down the keys.
>
> In fact you typically had to press one of the PA1/2/3 keys to unfreeze,
> move the cursor, and continue.
>
>
> So maybe this is interesting for your clicky synth keyboard idea after all:
>
> Put a solenoid in. And if you play out of tune or off the beat, lock the
> keyboard.  :)
>
>
> Best,
>
>   René
>
>
> > 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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>
> --
> --
> synth at schmitzbits.de
> http://schmitzbits.de
>



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