Remapping the HP150 keyboard
hp-fix at xs4all.nl
Sat Apr 18 15:09:38 CDT 2009
And now something completely different......(free after monty python)
Did you ever use the HP 59401A HP-IB analyzer ?
I aquired it through epay from a dutch firm, the display wasn't functioning
right (no memory position).
Witch turned out to be a bad 74L04 in the controller board, hanging up some
control signals, now it works oké.
But now I've to find some 'use' for the analyzer..
It's fun to look at the HP-IB(us) the display flickers nice, but is there
realy meaning full use for these analyzers ?
> -----Oorspronkelijk bericht-----
> Van: cctalk-bounces at classiccmp.org
> [mailto:cctalk-bounces at classiccmp.org] Namens Tony Duell
> Verzonden: zaterdag 18 april 2009 21:42
> Aan: cctalk at classiccmp.org
> Onderwerp: Re: Remapping the HP150 keyboard
> > How about KISS (keep it smart and simple).
> I've always expanded that as 'Keep it simple, stupid' :-).
> > Smart for the idea and simple for the building, exactly
> what you did
> > in my humble opinion.
> Thank you. I did conisder various mrthods of making a
> keyboard for the HP120, including using a microcontroller to
> interface a PC keyboard, but in the end went with (a) an HP
> keyboard and (b) the sort of design I am happiest with. After
> all, this is a hobby, so I can get to chose the design.
> > The use of the 4000 cmos series is in line with the
> engineering of the
> > HP120.
> Arguably using an 8048 microcontroller wouldn't have been out
> of line.
> After all the keyboard interface on the terminal PCB of an
> HP120 (and on the CPU board of an HP150) is handled by an
> 8041 (essentially an 8048 + host interface logic. I don't
> think HP ever used PICs in this sort of machine (for all they
> were certainly around at the time).
> I did use an EPROM that was far too large, I guess. I only
> needed 256 bytes. But using a 1702 or a 2708 was going to be
> a lot of work (I would have to generate a -ve supply). A 2716
> would have been the the 'right'
> choice, I guess, but 27C64s are a lot easier to find.
> > And like you said HP150 keyboards are 'easy' to find ;-)
> And rememeber I haven't ruined the one I've modified. If you
> just want to use it with the HP150, you just flick a swtich
> and you get the HP150 key mapping back. If you weant to
> return it to the original condtion, just dismantle and remove
> the modification stuff, pulg a 4024 into the socket on the
> keyboard PCB, and find some way to plug the 4 holes in the
> top case (or replace the top case with one from a spare
> keyboard -- it was used on other HP keybaords too). Not too bad.
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