PC keyboard to IC

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

Reply to
PADME
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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.

Reply to
j.b. miller

MANY years ago I built my own KVM switch, by sending the keyboard signals down a shift register and doing a broad-side decode to activate the switch. Following are the codes as seen at the shift register. I have schematics, if you're interested... but it's NOT a trivial task (as I did it... today probably just a uP :)

L-ALT 011101110 TAB 111110010 CAPS 111100111 L-SHFT 011101101 L-CTRL 011101011 SPACE 111010110 R-ALT 011101110 R-CTRL 011101011 R-SHFT 010100110 ENTER 010100101 BK-SP 010011001 INSERT 110001111 HOME 010010011 PG-UP 010000010 PG-DN 110000101 DELETE 010001110 END 010010110 UP-A 110001010 LEFT-A 110010100 DN-A 010001101 RT-A 010001011 Z 111100101 X 011011101 C 011011110 V 111010101 B 111001101 N 111001110 M 011000101 , 010111110 .. 110110110 / 110110101 A 111100011 S 011100100 D 111011100 F 011010100 G 111001011 H 011001100 J 111000100 K 010111101 L 010110100 ; 110110011 ' 110101101 Q 111101010 W 011100010 E 011011011 R 011010010 T 111010011 Y 011001010 U 011000011 I 110111100 O 010111011 P 010110010 [ 110101011 ] 110100100 ` 111110001

1 111101001 2 011100001 3 111011001 4 111011010 5 011010001 6 011001001 7 111000010 8 111000001 9 110111001 0 110111010

- 010110001 = 010101010 \ 110100010 ESC 110001001 F1 011111010 F2 011111001 F3 111111011 F4 011110011 F5 011111100 F6 111110100 F7 101111100 F8 011110101 F9 111111110 F10 011110110 F11 010000111 F12 111111000 PRT-SCR 011101101 SCRL-LK 010000001 PAUSE 010001000 NUM-LK 010001000 NUM / 110110101 NUM * 110000011 NUM - 010000100

7-HOME 010010011 8-UP 110001010 9-PG-UP 010000010 4-LEFT 110010100 NUM-5 110001100 6-RT 010001011 1-END 010010110 2-DN 010001101 3-PG-DN 110000101 0-INS 110001111 ..DEL 010001110 NUM + 110000110 NUM-ENT 010100101

...Jim Thompson

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|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
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Reply to
Jim Thompson

"PADME" schreef in bericht news: snipped-for-privacy@posting.google.com...

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:

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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

Reply to
petrus bitbyter

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?

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Danny
Reply to
Danny T

No - it is serial data plus a clock. Just two effectively active wires.

d

Pearce Consulting

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Reply to
Don Pearce

Righto! :-)

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Danny
Reply to
Danny T

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:

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

Lionel...

Reply to
Lionel Theunissen

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