[Coco] HP 64000 was Re: LIF util for OS-9?

[Willard Goosey]

On Mon, Dec 12, 2011 at 04:09:05PM -0500, Steven Hirsch wrote:
> Quick followup:  I found some ancient docs in my archives that talk a bit 
> more about the HP64000 CPU.  Transcribed below:
> 
> ...it used the BPC processor, which is the CPU part of the multi-chip set 
> used in the 9825 calculator.  The BPC was a cross between the HP2100 
> instruction set and the 21MX instruction set.  It had byte-addressable 
> instructions, and a return stack with a JSB variant that would push the 
> return address on the stack instead of the first word of the target 
> subroutine (necessary if the program was in rom...).

Wow!  That's pretty cool.  I don't have a 9825 but I do have a 9845B
and it is an awesome machine.

Unfortunately I don't think this gets you very far, HP seriously
discouraged assembly programming on the 98xx machines.  I don't know
anything about the 21xx machines.

Willard
-- 
Willard Goosey  goosey at sdc.org
Socorro, New Mexico, USA
I search my heart and find Cimmeria, land of Darkness and the Night.
  -- R.E. Howard