Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!tut.cis.ohio-state.edu!ucbvax!ROM.ECSE.RPI.EDU!black
From: black@ROM.ECSE.RPI.EDU (Jerry Glomph Black)
Newsgroups: comp.os.cpm
Subject: Z80 Algorithms
Message-ID: <8910161517.AA06146@rom.ecse.rpi.edu>
Date: 16 Oct 89 15:17:47 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 14

>Big deal! Use a 64180 (aka Z180) chip, has the MLT instruction, takes 17
>clock cycles, or 1.85 micro seconds.  (By the way: it's a 2-byte instruction)

>> Since when is the 64180 made by Zilog?  The 64180 is a Hitachi Z80 clone
>>with some additional instructions.

Zilog, having flubbed the Z280 project for so many years, was mortally
embarrassed by Hitachi's excellent 64180 chip (and even more excellent 1-chip
version, the 647180).  Thus they made a deal to market the 64180 under the
pseudonym Z180.  The 64180 is far more than a 'Z80 clone'. It does support
the Z80 instruction set, but has 2 asynch and 1 synch serial ports, 1 Meg
address space, 2 16-bit timers, and 4 external interrupt lines. 

Jerry Glomph Black, 8-bit terrorist