Xref: utzoo comp.os.cpm:2338 sci.electronics:5765
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!uw-june!uw-entropy!quick!amc!sigma!bill
From: bill@sigma.UUCP (William Swan)
Newsgroups: comp.os.cpm,sci.electronics
Subject: Re: New processor rumour
Summary: yup - 20MHz enhanced Z80s promised
Message-ID: <2259@sigma.UUCP>
Date: 4 Apr 89 16:54:29 GMT
References: <240@ericom.ericsson.se>
Reply-To: bill@sigma.UUCP (William Swan)
Followup-To: comp.os.cpm
Organization: The Keith Highlanders Pipe Band, Seattle WA
Lines: 40

In article <240@ericom.ericsson.se> etxbrfa@kk32.ericsson.se (Bj|rn Fahller TT/MLG) writes:
>I've heard some rumours that Zilog recently has released a NEW version of the
>Z80 processor. The new version should (according to the rumours) have a largely
>expanded instruction set, with multiplication, division, SIO routines, etc...
>
>Is this actually the case? I thought Z80 was out years ago.


I just took a look at Zilog's January 1989 Z80 Family Data Book and saw:

Z8400 (a.k.a Z80?):	("Advanced Information")
	At a quick glance this looks like a CMOS Z80, up to 10MHz. Nothing
	else jumps out as being different, other than packaging options.

Z80180 (a.k.a Z180?):	("Product Specification")
	"Code compatible", with 8-bit multiply (16 bit result) and several
	other new instructions (test and block operations, mainly). Up to
	10 MHz, on-chip MMU addressing 512k or 1Mbyte, two UARTS, two 16-bit
	timers, on-chip oscillator, etc.

Z280:	("Preliminary Product Specification")
	20 MHz CMOS pipelined Z80 superset with MMU addressing up to 16
	Mbytes, 3 16-bit counter-timers, 4 DMA channels, full-duplex UART,
	on-chip 256-byte instruction and data associative cache, co- and
	multi-processor support, etc. No mention of multiply/divide...


Interesting stuff (a 20 MHz Z80!!!), but working from Zilog's track record 
on the Z800 (I got a spec sheet in '81 - when was it that it actually came
out?), I won't believe it until I actually see it...

[Note:  I set Followups: to comp.os.cpm only as I don't believe anyone else
 would be interested in a 20 MHz Z80! :-)]


-- 
William Swan	..!grace.apl.washington.edu!sigma!bill
	Innocent but in prison in Washington State for 13.5 years:
	Debbie Runyan: incarcerated 01/1989, scheduled release 07/2002.
	               In now:  0 years,  2 months,  2 weeks,  1 day.