HP85 CPU

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Mon Jan 12 14:30:37 2004

>
> Hi am looking for an hp 85 cpu=20
>
> I have been hunting the net , in hopes of finding one , =20
> am also looking for an HP 85 service rom 00085-15006
>
> the cpu was made by capricorn , lots of differen't definitions=20

No, the CPU is _called_ Capricorn. That's the HP code name for it. AFAIK
it was designed and made by HP.

> or the cpu on the internet.
>
> is there possibly a modern chip that could be used in place of it ?

Unlikely. It's got a strange instruction set, strange logic levels (6V),
and even stranger clock signals (4 phase clock at 12V levels IIRC).
There's nothing that will drop in in place of it.

-tony
Received on Mon Jan 12 2004 - 14:30:37 GMT