[sdiy] WinTel Keyboard by 2

[Sowa Roman]

Been there, done that...

Actually it was a 'magic box' that connected to phone line
so you could call a special number and use DTMF tones to type
PC keyboard. What I did was rather brutal but it worked OK.
Whenever this device wanted to send a character to PC,
2 transistors clamped keyboard's CLOCK and DATA lines to GND,
so the keyboard didn't even know that something else sent
pulses to PC. It also prevented from unwanted keystrokes
when 'device' was sending something.
Little modification of the keyboard used 2 transistors and
2 or 4 resistors, can't remember.

This could be done probably better by a mux (4053?)
controlled by envelope follower :) connected to
second keyboard CLK line.

hope that helps

Roman

__-----Original Message-----
__From: Batz Goodfortune [mailto:batzman at all-electric.com]
__Sent: Friday, June 28, 2002 4:30 AM
__To: synth-diy at dropmix.xs4all.nl
__Subject: [sdiy] WinTel Keyboard by 2
__
__
__Y-ellow all.
__         If someone out there is privy to the inner workings 
__of a standard 
__(5pin DIN) keyboard, would you at all be able to advise me.
__
__I want to add a second keyboard to the I/Face for the purpose 
__of butchering 
__it one into a custom function layout. One of my audio 
__recorders (Creamware) 
__has always had an awful layout and isn't really conducive to quick 
__operations. Especially when you're miles away at the time and 
__you need to 
__stop/start it recording.
__
__As I recall, the keyboard I/Face is an open collector drive 
__at each end. 


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