Date   : Sun, 09 Aug 1992 08:22:03 GMT
From   : math.fu-berlin.de!zrz.tu-berlin.de!cs.tu-berlin.de!fauern!LRZnews!regent!mch@uunet.uu.net (Michael Hermann)
Subject: Re: z800/z80000

alpha@wyvern.twuug.com (Joe Wright) writes:

>jeffj@panix.com (Jeff Jonas) writes:
>: 
>: I too have the "preliminary" spec sheets for the Z800 and Z80,000.
>: I doubt they went very far.
>: I recall hearing that the Z800 was done in NMOS and the Z180
>: replaced it, being CMOS.
>: ....

>Not exactly.  Zilog did indeed have a z8000 (not 80,000).  The stillborn
>z800 became the z280, not the z180.  The hd64180 was an independent
>development by Hitachi.  When Zilog and Hitachi made a deal for 
>Hitachi to make the z280 (z800) Hitachi agreed to let Zilog make the
>64180 and call it a z180.

>-- 
>Joe Wright  alpha@wyvern.twuug.com    

I didn't know that Hitachi actually makes Z280's. Z180 is based
on HD64180, but has some minor changes to make it more compatible
to the Z80-interrupt scheme (easy connection to Z80 peripherals).

Z80,000 was the processor I wanted to go with after my Z8001. But
as the years went by nothing showed up until at a local university
booth a Zilog-speaker said, that they had actually done some chips.
But they consumed too much power (NMOS, then) and they didn't know
if the NMOS-parts would ever get ready for the masses.

A while ago I read about two new developements, th Z16C00 and the
Z320. When I asked Zilog, they told me that Z16C00 is compatible
to Z8000 but CMOS. I don't have any data on it, maybe it uses
fewer clocks for some instructions.
Z320 was claimed to be their Z80,000 in CMOS, but I have no data
either. If it is Z80,000 as the 1984 tech. man. defines it, it
would be too slow to be useful.

Michael