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'MEMKEY is awesome'
1999\05\03@211633 by Bob Blick

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Hi Everyone,

Check out:
http://www.solutions-cubed.com/

I got a MEMKEY, and it's pretty neat. If I'd gotten one a few months ago it
would have saved me some hassle with my car's mp3 player.

It's a keypad encoder that has two output protocols: serial(rs-232 type) or
PC-AT keyboard emulation. It's programmable, too. I've never seen something
like this that does both protocols or was this affordable. It's got a PIC
on it, of course :-)

Cheers,
Bob

1999\05\03@230548 by Mark Willis

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Neat tool.  Another company makes a similar product
(http://www.hagstromelectronics.com/modules.html, $44 for their 9x9
KE18, more for others) but at $36, that's a decent price for the MEMKEY.

 Hagstrom's KE24's are decent if you need "more keyboard" (up to 144
keys).  Need to get Robin's installed, if she'll ever figure out how she
wants it.

 Mark

Bob Blick wrote:
{Quote hidden}

1999\05\03@235704 by ryan pogge

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yea that is neat,
I remember when we where talking about this when I needed to hook a
matrix keypad to a PS/2 port...
man I wish I woulda seen this!  however if you are interested I did go
ahead and Buy a
cheepo keyboard for $5.95, from which I pulled the controller chip...
It works great.
I hooked up individual buttons to the correct traces. I still haven't
figured out how to interface
the 4x4 to it though since pressing a key would activate more than one
set of the
keyboard controller chip pins.

but I might just order one of those MEMKEY's .. Ill let everyone know
if it works as advertised.

regards,
Ryan


> Neat tool.  Another company makes a similar product
> (http://www.hagstromelectronics.com/modules.html, $44 for their 9x9
> KE18, more for others) but at $36, that's a decent price for the
MEMKEY.
>
>   Hagstrom's KE24's are decent if you need "more keyboard" (up to
144
> keys).  Need to get Robin's installed, if she'll ever figure out how
she
{Quote hidden}

months ago it
> > would have saved me some hassle with my car's mp3 player.
> >
> > It's a keypad encoder that has two output protocols: serial(rs-232
type) or
> > PC-AT keyboard emulation. It's programmable, too. I've never seen
something
> > like this that does both protocols or was this affordable. It's
got a PIC
> > on it, of course :-)
> >
> > Cheers,
> > Bob
>

1999\05\04@085550 by paulb

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ryan pogge wrote:

> I did go ahead and Buy a cheepo keyboard for $5.95, from which I
> pulled the controller chip...

 Very pragmatic.

> I hooked up individual buttons to the correct traces. I still haven't
> figured out how to interface the 4x4 to it though since pressing a key
> would activate more than one set of the keyboard controller chip pins.

 I think you mean the problem is that your 4 x 4 matrix keyboard would
have a fixed encoding as a "chunk" of characters e.g.:

1 2 3 4     ... while the MEMKEY allows whatever encoding you choose
q w e r    for the individual keys.
a s d f
z x c v      What is particularly interesting about the MEMKEY is that
           it is implemented in hardware as a STAMP clone, using a
16C55 and serial EEPROM, rather than a single 16F84.  It is, it appears,
still much cheaper to use this two-chip combination.
--
 Cheers,
       Paul B.

1999\05\04@111257 by Bob Blick

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On Tue, 4 May 1999, Paul B. Webster VK2BZC wrote:
>             it is implemented in hardware as a STAMP clone, using a
> 16C55 and serial EEPROM, rather than a single 16F84.  It is, it appears,
> still much cheaper to use this two-chip combination.

Nope, it's a 16c622. The eeprom stores the settings. One of the things
that is really nice is the keyboard connector is assignable, you can
reprogram the MEMKEY to change which pins are rows and columns in any
order and combination, so the cabling is easy. The eeprom also stores the
keys and typematic settings.

-Bob

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