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PICList Thread
'PC Keyboard Details'
1997\04\18@143436 by Tim Kerby

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I am currently working on a PIC project with my best friend (there are two
of us!) which will be able to record and play keyboard data.  This will be
a useful module for keyboard diagnostics (where keyboard data is read and
played on another machine), hardware macro recording (so nobody need see me
type in a system password etc), PIC data input (a large keyboard with
serial output is pretty useful) and even a far off idea of a typewriter
where eventually data would be read, displayed on an lcd and when ready
played back to a pc.  Unfortunately, all we have come up with between us is
that there are two types of connector, 5 pin standard din and ps/2 and also
that data is transmitted with a clock and data line.  We think they stay at
0v normally and use ttl.

We want to know:  Pinouts of both connectors, data transmission protocol
(the actual key to data is not crucial yet but we want to know how a byte
of info is transmitted), voltage levels and any other details.


Thanks very much,

               Tim Kerby and Nicholas Humfrey  (note our unusual surnames - we
are very
rare people!)


------------------------------------------------------------------
Personal Web Pages: http://web.ukonline.co.uk/members/tim.kerby/
PIC Site: web.ukonline.co.uk/members/tim.kerby/pic/
The PIC Pages are under construction and I am looking for projects
------------------------------------------------------------------

1997\04\18@180042 by ags

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The keyboard protocol is BIZARRE at best.  I designed a project very
similar to the one
which you are talking about using an HC11.  (In retrospect, I should have
used an 8051 because you can get code that already does the protocol for
it.)
To get the actual protocol, I called IBM and got them to fax me a few pages
out of a reference manual.  (Although I think I remember now that Circuit
Cellar did an article on it a year or two ago, you might want to ask there.
http://www.circellar.com)

There are actually three different ways of doing the protocol.  I wish you
the best of luck.

Good luck,

Alan G. Smith

+---------------------------------------------------------
| Alan G. Smith
| spam_OUTagsTakeThisOuTspampoboxes.com
| http://www.innovatus.com/ags

1997\04\18@202515 by Don McKenzie

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Tim Kerby wrote:
>
> I am currently working on a PIC project with my best friend (there are two
> of us!) which will be able to record and play keyboard data.  This will be

Hey Tim, have a look at:
http://www.arne.si/~mauricio/PIC.HTM
This may save you re-inventing the PIC to AT keyboard to PIC routines.

Don McKenzie  .....donKILLspamspam@spam@dontronics.com   http://www.dontronics.com

Send a blank message to helpspamKILLspamdontronics.com for more info.
SLI, the serial LCD that auto detects baud rates from 100 to 125K bps.
SimmStick(tm) A PIC proto PCB the size of a 30 pin Simm Memory Module.

1997\04\18@211932 by jvainion

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> We want to know:  Pinouts of both connectors, data transmission protocol
> (the actual key to data is not crucial yet but we want to know how a byte
> of info is transmitted), voltage levels and any other details.

       I don't remember the subpage address now, but you should be able to
find some usefull info at http://www.hut.fi/~then/

1997\04\19@095221 by John Sanderson

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For Tim Kerby ....
goto:
http://www.blackdown.org/~hwb/hwb.html
..
these guys have a wealth of pinout reference material etc.
email from John Sanderson   /   JS Controls, Boksburg, RSA
Manufacturer & purveyor of laboratory force testing apparatus
and related products and services.
Tel/fax: Johannesburg 893 4154    Cellphone 082 453 4815

1997\04\21@035550 by Wolfram Liebchen

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At 10:21 19.04.97 +1100, you wrote:
>Hey Tim, have a look at:
>http://www.arne.si/~mauricio/PIC.HTM
>This may save you re-inventing the PIC to AT keyboard to PIC routines.

Is the PC/AT keyboard interface patented by IBM? I think so.
There was an article in a computer magazine, that reported IBM's
practice, to ask for money from manufacturers, that use their patents.
There are: Keyboard interface, "Floppy seek test", and a lot of other
"useful" things in a PC.

-- Wolfram


+-----------------------------------------------------+
| Wolfram Liebchen                                    |
| Forschungsinstitut fŸr Optik, TŸbingen, Deutschland |
| .....liebchenKILLspamspam.....ffo.fgan.de                         |
+-----------------------------------------------------+

1997\04\21@100746 by fred

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John Sanderson wrote:
>
> For Tim Kerby ....
> goto:
> http://www.blackdown.org/~hwb/hwb.html
> ..
> these guys have a wealth of pinout reference material etc.
> email from John Sanderson   /   JS Controls, Boksburg, RSA
> Manufacturer & purveyor of laboratory force testing apparatus
> and related products and services.
> Tel/fax: Johannesburg 893 4154    Cellphone 082 453 4815


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