PC keyboard to IC

P

PADME

Guest
Hi all,

I've heard there is an IC which can convert an IBM PC keyboard to ASCII.

Any help is very appreciated.

Thank you in advance
Padme
 
"PADME" <padmow_69@yahoo.com> schreef in bericht
news:4b2e113.0501150408.5d58db3f@posting.google.com...
Hi all,

I've heard there is an IC which can convert an IBM PC keyboard to ASCII.

Any help is very appreciated.

Thank you in advance
Padme
Click to expand...

Wel,

The old IBM PC-AT used an Intel 8042 for a keyboard processor. Current PCs
still have compatibel keyboardprocessors, embedded in theit chipsets. You
can find several other projects of interfacing a PC keyboard. For instance:
http://www.electronic-engineering.ch/microchip/projects/keyboard/v1xx/keyboard_v1xx.html
Except for that 8042 I'm not aware of a dedicated IBM keyboard interface
chip, but enough examples of programming a micro for it.
BTW You did not mention what kind of interface you need for the ASCII.
Serial? Parallel? USB? I2C? SSP? CAN?

petrus bitbyter
 
j.b. miller wrote:
Google is your friend..

several companies have high price 'convertors', plug and go types...
or
you can do it yourself for about $5, all you need is a small
microcomputer( I use the now 'obsolete' PIC16C84 ) and some time. Easy to
program, TONS of info on the web about it, just need to ask Google.

Seems to be a 'classic' project for colleges,etc.
Click to expand...
May I but in with a quick question? I've no intention of doing this, but
the post's got me curios... How many wires in a PS2 cable, and when I
press a single key on my keyboard, what gets sent? Is it just a binary
value for a key (eg. 7 wires would give 128 possibly keys), or is it
something more clever?

--
Danny
 
On Sat, 15 Jan 2005 19:00:04 +0000, Danny T <danny@nospam.oops> wrote:

j.b. miller wrote:
Google is your friend..

several companies have high price 'convertors', plug and go types...
or
you can do it yourself for about $5, all you need is a small
microcomputer( I use the now 'obsolete' PIC16C84 ) and some time. Easy to
program, TONS of info on the web about it, just need to ask Google.

Seems to be a 'classic' project for colleges,etc.

May I but in with a quick question? I've no intention of doing this, but
the post's got me curios... How many wires in a PS2 cable, and when I
press a single key on my keyboard, what gets sent? Is it just a binary
value for a key (eg. 7 wires would give 128 possibly keys), or is it
something more clever?
Click to expand...
No - it is serial data plus a clock. Just two effectively active
wires.

d

Pearce Consulting
http://www.pearce.uk.com
 
On Sat, 15 Jan 2005 04:08:52 -0800, PADME wrote:

Hi all,

I've heard there is an IC which can convert an IBM PC keyboard to ASCII.

Any help is very appreciated.

Thank you in advance
Padme
Click to expand...

There's a _bunch_ of information out there:

http://www.google.com/search?q=ps2+keyboard+interface+spec

Have Fun!
Rich
 
"Rich Grise" wrote:

There's a _bunch_ of information out there:

http://www.google.com/search?q=ps2+keyboard+interface+spec
Click to expand...
I have some PIC code that reads an AT style keyboard and outputs RS-232.
It was one of my very first PIC projects. It carries out the
initialization and converts scan codes into ASCII. It's not complete
though, it needs to handle the caps-lock and some other keys better.
It's half of my portable 4*20 LCD terminal project. It could probably
be crammed into an Altoids box for the ultimate in stylish geekism ;-)
 
Years ago I wrote some PIC code for a mini-terminal with an AT keyboard
input and ASCII RS232 output. I think a PS/2 keyboard will work with a plug
adaptor. The source code is available here:

http://www.dontronics.com/dt102.html

Click the newterm.zip link at the bottom of the page.

Lionel...

PADME <padmow_69@yahoo.com> wrote in message
news:4b2e113.0501150408.5d58db3f@posting.google.com...
Hi all,

I've heard there is an IC which can convert an IBM PC keyboard to ASCII.

Any help is very appreciated.

Thank you in advance
Padme
Click to expand...
 
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