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PICList Thread
'Keyboard faker'
1997\01\17@165143 by Scott Horton

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I would like to build a PIC based device to "trick" a laptop into thinking
an AT style keyboard is plugged into it's external keyboard port on power
up or on wake-up from standby.

Does anyone have any code, or pointers to help me with this.  I don't need
to send any key's, just have it behave as if it's there.  A keyboard
"ghost".  I know a company that makes a device to do this, but I'd like to
make one myself.

Thanks VERY much in advance for any help.

Scott

1997\01\17@171637 by Byron A Jeff

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>
> I would like to build a PIC based device to "trick" a laptop into thinking
> an AT style keyboard is plugged into it's external keyboard port on power
> up or on wake-up from standby.

Not difficult at all. In fact my project this weekend is to build an AT
style keyboard using a miniature 5x8 keypad. I need it for my new Toshiba
pen top.

>
> Does anyone have any code, or pointers to help me with this.  I don't need
> to send any key's, just have it behave as if it's there.  A keyboard
> "ghost".  I know a company that makes a device to do this, but I'd like to
> make one myself.

Go out on the web and check out this URL:

http://www.paranoia.com/~filipg/HTML/LINK/PORTS/F_Keyboard_FAQ.html

It has everything you want to know about PC keyboards.

Bottom line you need a PIC to:

1) send the POST OK byte (AA) on power up.
2) Provide a clock to the host upon request because a PC keyboard is
  bi-directional and stuff like typematic rate and setting the LEDs.
3) Send proper acknowledge if host request a command.

The data format, commands, and response can be found at the web page above.
You can even get power from the keyboard port.

>
> Thanks VERY much in advance for any help.

Well I hope this helps, I'll let you folks know how the mini keyboard is
going...

BAJ

1997\01\18@024106 by Mike

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>I would like to build a PIC based device to "trick" a laptop into thinking
>an AT style keyboard is plugged into it's external keyboard port on power
>up or on wake-up from standby.
>
>Does anyone have any code, or pointers to help me with this.  I don't need
>to send any key's, just have it behave as if it's there.  A keyboard
>"ghost".  I know a company that makes a device to do this, but I'd like to
>make one myself.
>
>Thanks VERY much in advance for any help.
>
>Scott

Why don't you just disable the checking for a keyboard in the BIOS ?

Turn off keyboard 'installed' and the machine should boot up whether a
keyboard is installed or not !

Rgds


Mike

1997\01\20@091025 by Scott Horton

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=->>Scott
=->
=->Why don't you just disable the checking for a keyboard in the BIOS ?
=->
=->Turn off keyboard 'installed' and the machine should boot up whether a
=->keyboard is installed or not !


First of all, I can't in a Compaq Laptop (or at least I don't know how
<g>).  Second and mainly, the whole reason for doing this is so I can use a
scanner that is a keyboard wedge adn requires the use of a keyboard.  The
PC won't recognize that anything is attached to the port unless I have a
keyboard attached.  I don't need an external keyboard for entry, thus the
desire to have a keyboard faker.

Thanks anyway for the suggestion.

Scott

1997\01\21@082748 by ctm

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Scott Horton wrote:
>
> I would like to build a PIC based device to "trick" a laptop into thinking
> an AT style keyboard is plugged into it's external keyboard port on power
> up or on wake-up from standby.
>
> Does anyone have any code, or pointers to help me with this.  I don't need
> to send any key's, just have it behave as if it's there.  A keyboard
> "ghost".  I know a company that makes a device to do this, but I'd like to
> make one myself.
>
> Thanks VERY much in advance for any help.
>
> Scott


Scott-

I stumbled upon the following web site:

http://www.arne.si/~mauricio/PIC.HTM

Check it out. It might be of some help.

Chris
spam_OUTctmTakeThisOuTspamsprynet.com

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