8088 vs. 80c88

[Steven Hirsch]

On Sun, 1 Mar 2009, Chuck Guzis wrote:

>> I assumed the rabbit was a z180, you learn something new every day.  I
>> have done a few designes with z180's, but I cant even rememer what
>> language tools I used at this point.
>
> The Rabbit Semiconductor R2000, R3000, R4000 series (still being
> made) are Z80/Z180 "sort-of".  Lots of "rarely used" opcodes (e.g.
> DAA, IN, OUT, etc.) are replaced by other instructions.  See:
>
> http://www.rabbit.com/documentation/docs/manuals/Rabbit4000/Instructio
> nReference/
>
> How much patching do you think it would take to get CP/M to run on an
> R3000?

There was a long thread pertaining to this on comp.os.cpm recently.  The 
concensus was that while a port of CP/M itself could be done, there were 
potential issues with applications and utility programs.


--