Schematic PS2 Keyboard

V

VMI

Guest
Hi all,
I've been looking for hours to find a schematic of a PS2 keyboard; but no
chance.
My problem is that I need to build a board with 10 keys who represents the
F1 to F10.
The output is to be fed in to a standard pc that must recognize these keys
and take relevant action.
No aditional sw is to be installed in to the pc to recognize the keys.

I was thinking of canibalizing a standard keyboard and rebuild it with the
parts in it.
But there fore I need a schematic.

Who can help or point me in a direction.

Many thanks,

Marco
 
VMI wrote:

Hi all,
I've been looking for hours to find a schematic of a PS2 keyboard; but no
chance.
My problem is that I need to build a board with 10 keys who represents the
F1 to F10.
The output is to be fed in to a standard pc that must recognize these keys
and take relevant action.
No aditional sw is to be installed in to the pc to recognize the keys.

I was thinking of canibalizing a standard keyboard and rebuild it with the
parts in it.
But there fore I need a schematic.

Who can help or point me in a direction.

Many thanks,

Marco



I could copy the schematic from the IBM Technical Reference Manual,
Click to expand...
First Edition (Aug 1981).
The original keyboard is 100 percent compatible.
However, the microcontroller code does not seem to be disclosed (8048).
 
Hi Robert,
Thanks for the offer .
I think it's a bit to dated to be of any use.
I was thinking of a modern keyboard with a single chip in it.
I only have to get the F1 to F10 keys; code it and send it to the pc.
Thanks any way,
Marco

"Robert Baer" <robertbaer@earthlink.net> wrote in message
news:mOeVd.1896$L17.1015@newsread3.news.pas.earthlink.net...
VMI wrote:

Hi all,
I've been looking for hours to find a schematic of a PS2 keyboard; but
no
chance.
My problem is that I need to build a board with 10 keys who represents
the
F1 to F10.
The output is to be fed in to a standard pc that must recognize these
keys
and take relevant action.
No aditional sw is to be installed in to the pc to recognize the keys.

I was thinking of canibalizing a standard keyboard and rebuild it with
the
parts in it.
But there fore I need a schematic.

Who can help or point me in a direction.

Many thanks,

Marco



I could copy the schematic from the IBM Technical Reference Manual,
First Edition (Aug 1981).
The original keyboard is 100 percent compatible.
However, the microcontroller code does not seem to be disclosed (8048).
Click to expand...
 
"VMI" <fa453213@skynet.be> wrote in message
news:42256edb$0$18766$ba620e4c@news.skynet.be...
Hi all,
I've been looking for hours to find a schematic of a PS2 keyboard; but no
chance.
My problem is that I need to build a board with 10 keys who represents the
F1 to F10.
The output is to be fed in to a standard pc that must recognize these keys
and take relevant action.
No aditional sw is to be installed in to the pc to recognize the keys.

I was thinking of canibalizing a standard keyboard and rebuild it with the
parts in it.
But there fore I need a schematic.

Who can help or point me in a direction.
Click to expand...
I would use a suitable MCU and program it to emulate the keys you need, with
a suitable set of keys, as a 'wedge' and use it instead of/with a standard
keyboard. This technique is often used with barcode scanners.

You'll find details of this sort of thing on the web, quite easily, with
code for the MCU.

Leon
--
Leon Heller, G1HSM
http://www.geocities.com/leon_heller
 
You really don't need a scheamtic, just a pair of good eyes.Sit down and
follow the 2 lines going to F1, and make a map which pins they get connected
to the 'chip' that's in the kbd. Do this for the other F keys and you've
sucessfully 'reverse engineered' that keyboard. Obviously different brans of
kbds will have different 'maps' but this route does work and won't take more
than an afternoon.
Another way is to short out the various rows/columns pins of the 'chip' and
see what character or action is displayed on the PC screen. I used a simple
BASIC program to display this info several years ago when I made 'custom'
kbds.
Either way you get what you need and an education to boot.
Jay
 
"VMI" <fa453213@skynet.be> wrote in message
news:42256edb$0$18766$ba620e4c@news.skynet.be...
Hi all,
I've been looking for hours to find a schematic of a PS2 keyboard; but no
chance.
My problem is that I need to build a board with 10 keys who represents the
F1 to F10.
The output is to be fed in to a standard pc that must recognize these keys
and take relevant action.
No additional sw is to be installed in to the pc to recognize the keys.
Click to expand...
I suspect the scan codes reflect the original keyboard matrix.

That is, hex code XY corresponds to position X,Y.

Other keyboards may differ in their physical matrix,
so long as they report the right scan codes.

I was thinking of cannibalizing a standard keyboard and rebuild it with
the
parts in it.
Click to expand...
Yes, that would be a valid solution.
You can buy them new for a few Ł/$.

But therefore I need a schematic.
Click to expand...
You are going to have to check the matrix of the particular keyboard
controller chip you obtain.

In which case you don't need a schematic.

Take a cheap keyboard apart, spend a few minutes with a multimeter and you
will find the details you need.

I did this myself when I wanted an ultra-thin and light membrane keyboard
for a project.
 
On Wed, 2 Mar 2005 08:45:53 +0100, "VMI" <fa453213@skynet.be> wrote:

My problem is that I need to build a board with 10 keys who represents the
F1 to F10.
The output is to be fed in to a standard pc that must recognize these keys
and take relevant action.
No aditional sw is to be installed in to the pc to recognize the keys.

I was thinking of canibalizing a standard keyboard and rebuild it with the
parts in it.
But there fore I need a schematic.
Click to expand...
IMHO you do not really need a schematic; open it (buy a cheap one for
few $); there is a single chip inside with a maybe 2 connectors on the
small PCB with plugged in "plastic PCB foils" with contacts &
perforated insulation layer between them. Just found out on chip pins
which 2 pins are shorted when certain key is pressed ! Within max 1h
you should locate that IMHO ...
--
˛˛ ˛˛ Regards , SPAJKY ®
\\.//_. mail addr. @ my site @ http://www.spajky.vze.com
\°/ ".. long live & prosper.." - 3rd year anniversary 4 :
|| "Tualatin OC-ed / BX-Slot1 / inaudible setup!"
 
Yep guys, you're right.
I quit working and playing with PC hardware the year after Win95; when the
price of computer material started to drop fast, faster and even faster.
I also quit having sleepless nights with troubles generated by windows and
became a "user".
I Changed direction and concentrated fully on Geodesic Domes and guitar
amplifiers.
Lately an application needing a modified (customized) keyboard made me look
after a schematic of a keyboard.
But as you all say, trace it to the chip and voila; it's done.
That's what I will do.
Thanks for the tip.
Cheers,
Marco
 
In article <42256edb$0$18766$ba620e4c@news.skynet.be>, fa453213
@skynet.be says...
Hi all,
I've been looking for hours to find a schematic of a PS2 keyboard; but no
chance.
My problem is that I need to build a board with 10 keys who represents the
F1 to F10.
The output is to be fed in to a standard pc that must recognize these keys
and take relevant action.
No aditional sw is to be installed in to the pc to recognize the keys.

I was thinking of canibalizing a standard keyboard and rebuild it with the
parts in it.
But there fore I need a schematic.
Click to expand...
How about a numeric keypad and then remap the keys in software?

--
Keith
 
On Wed, 02 Mar 2005 08:45:53 +0100, VMI wrote:

Hi all,
I've been looking for hours to find a schematic of a PS2 keyboard; but no
chance.
My problem is that I need to build a board with 10 keys who represents the
F1 to F10.
The output is to be fed in to a standard pc that must recognize these keys
and take relevant action.
No aditional sw is to be installed in to the pc to recognize the keys.

I was thinking of canibalizing a standard keyboard and rebuild it with the
parts in it.
But there fore I need a schematic.

Who can help or point me in a direction.
Click to expand...
You don't need no steenkeeng schematic. ;-) When you open the keyboard,
look at the lines on the plastic flex-circuit matrices:

http://neodruid.net/KeyZilla/index.html#Keyboard

Just trace what chip pins the F1-Fn keys go to, and duplicate that.

Have Fun!
Rich
 
VMI wrote:

Hi Robert,
Thanks for the offer .
I think it's a bit to dated to be of any use.
I was thinking of a modern keyboard with a single chip in it.
I only have to get the F1 to F10 keys; code it and send it to the pc.
Thanks any way,
Marco

"Robert Baer" <robertbaer@earthlink.net> wrote in message
news:mOeVd.1896$L17.1015@newsread3.news.pas.earthlink.net...

VMI wrote:


Hi all,
I've been looking for hours to find a schematic of a PS2 keyboard; but

no

chance.
My problem is that I need to build a board with 10 keys who represents

the

F1 to F10.
The output is to be fed in to a standard pc that must recognize these

keys

and take relevant action.
No aditional sw is to be installed in to the pc to recognize the keys.

I was thinking of canibalizing a standard keyboard and rebuild it with

the

parts in it.
But there fore I need a schematic.

Who can help or point me in a direction.

Many thanks,

Marco




I could copy the schematic from the IBM Technical Reference Manual,
First Edition (Aug 1981).
The original keyboard is 100 percent compatible.
However, the microcontroller code does not seem to be disclosed (8048).



That is *exactly* what the original PC keyboard had.
Click to expand...
The wiring is the same, and until recently, even the same IC was used.
Now the IC is either a shrunk version or an ASIC with a blob of epoxy
over it.
The IC does the same thing in both cases.
The keys are in a X-Y matrix of wires from/to the IC, which does the
sensing and creation of key codes.
In essence, the schematic is useless, due to the "work" that
microcontroller does.
 
Hi uys, hat's what will be done this weekend.
Thanks for the extra push to do it.
Marco

"Rich Grise" <richgrise@example.net> wrote in message
news:pan.2005.03.02.20.10.39.296529@example.net...
On Wed, 02 Mar 2005 08:45:53 +0100, VMI wrote:

Hi all,
I've been looking for hours to find a schematic of a PS2 keyboard; but
no
chance.
My problem is that I need to build a board with 10 keys who represents
the
F1 to F10.
The output is to be fed in to a standard pc that must recognize these
keys
and take relevant action.
No aditional sw is to be installed in to the pc to recognize the keys.

I was thinking of canibalizing a standard keyboard and rebuild it with
the
parts in it.
But there fore I need a schematic.

Who can help or point me in a direction.

You don't need no steenkeeng schematic. ;-) When you open the keyboard,
look at the lines on the plastic flex-circuit matrices:

http://neodruid.net/KeyZilla/index.html#Keyboard

Just trace what chip pins the F1-Fn keys go to, and duplicate that.

Have Fun!
Rich
Click to expand...
 
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