PC Keyboard to a microcontroller - Electronic Circuits Projects Diagrams Free

mod_critical · 25th May 2003, 08:34 PM

Quote:

Originally Posted by Mosfet

There is a company called Semtech [www.semtech.com] which sells keyboard interface ICs.
I haven't used them but they bought a company called Usar, whose chip I used to interface the common PC keyboard to any serial port on a microcontroller. I have a 8052 micro with a 4 line LCD that I can program directly typing on a spare IBM keyboard.
Semtech has several keyboard interface chips, maybe one could help you. Regards.

Hey what chip is that? And will it work with a PS/2 keyboard? I want to build a program for my Rabbit Core 2000 that will read the input for a PS/2 magnetic card reader and unlock a door. Everything is pretty simple, except for getting the data from the card reader. I figured I'd just have to decode the PS/2 output, but I haven't really thought about it because of other projects. Thanks!

Mosfet · 25th May 2003, 09:48 PM

Like I said USAR isn't in existence any more and Semtech bought them out back in 1999.
The chip was a USAR Systems UR6HCPCS-P version 1.2.
It was a 40 pin chip that let me hook up a standard PC keyboard, the little 6 pin or big 5 pin connector.
Both are the same actually just a different connector.
It decoded the odd-ball IBM keyboard signals to standard serial.
Perfect for my 8052 microcontroller with it's serial input.
I mounted the 8052 & LCD in a kids metal lunch box and borrowed a PC keyboard wherever I went.

The Semtech page for keyboard encoders is:
http://www.semtech.com/products/prod..._TableID_E_501
It appears the new chips even handle USB keyboards.

Weren't old Apple II keyboards serial?

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25th May 2003, 09:48 PM	#2
Mosfet	Like I said USAR isn't in existence any more and Semtech bought them out back in 1999. The chip was a USAR Systems UR6HCPCS-P version 1.2. It was a 40 pin chip that let me hook up a standard PC keyboard, the little 6 pin or big 5 pin connector. Both are the same actually just a different connector. It decoded the odd-ball IBM keyboard signals to standard serial. Perfect for my 8052 microcontroller with it's serial input. I mounted the 8052 & LCD in a kids metal lunch box and borrowed a PC keyboard wherever I went. The Semtech page for keyboard encoders is: http://www.semtech.com/products/prod..._TableID_E_501 It appears the new chips even handle USB keyboards. Weren't old Apple II keyboards serial?