Keybard repair help. Older terminals

16 Jan 2008

...

  machine, I'd want the entire keyboard to make
a keyboard for my 9915. 
 It's electrically rhe same matric, just in a keyboard-only box, if you 
 see what I mean, so an HP85 keybaord could be wired up).  
     I'd use a common PC keyboard and a small microcontroller :o) 
Good luck.. The 9915 keyboard interface is for a matrix-of-switches dumb 
keyboard. I don't know how fast it scans, a microcontorller might be able 
to keep up. The main prolem is that it's not at TTL levels (I think it's 
at 6V CMOS levels). 

In any case, given a keyboard using individual switches (as opposed to a 
membrane or anything like that), I'd probably just re-wire the switch 
connections and eliminate 2 microcontrollers and associated components. 

...

  I wish. I have the HP part number for it
somewhere, but the Agilent 
 partsfinder had never heard of it.   
     Is it on old hp catalogs? I have some :o) 
I doutb it. It's mentioned in the HP85 service manual (available on the 
MoHPC CD-ROM set), for example. It's not the sort of thing generally 
advertised to customers.

-tony

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Keybard repair help. Older terminals