Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!ub!dsinc!bagate!cbmvax!daveh
From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Fusion-40, the 68040 Card for A2000 avail...
Message-ID: <22713@cbmvax.commodore.com>
Date: 26 Jun 91 20:26:51 GMT
References: <1991Jun20.114837.22962@unibi.uni-bielefeld.de>
Reply-To: daveh@cbmvax.commodore.com (Dave Haynie)
Organization: Commodore, West Chester, PA
Lines: 43

In article <1991Jun20.114837.22962@unibi.uni-bielefeld.de> markus@techfak.uni-bielefeld.de (Markus Illenseer) writes:

>The US-Company RCS offers the 68040 Card 'Fusion-40' since "now"....

>The Processor is working internally with a Tact-Rate of 50 Mhz, though the
>external Rate will be 25 MHz.

In other words, an ordinary, everyday 68040.  All 68040s run with an ALU clock
that's twice the speed of the bus clock.  The bus clock is the part's rating,
which is currently 25MHz and may some day be 33MHz and beyond.

>The given 18 Mips is a bit slow, 

Well, there are MIPS and there are MIPS.  You can get a 68040 MIPS rating any 
number of ways:

	- Write down the number from the Motorola adds.
	- Calculate how many [not necessarily typical instructions] per second
	  it'll crank through.
	- Run any random program for the Amiga that gives you a number it calls
	  "MIPS".
	- Run Dhrystone 2.1, and divide the result by the number in the charts 
	  for a VAX 11/780.

>Also it is not mentioned whether the card can be plug into the Processor-Slot 
>or in a Zorro-II(I) Slot, 

It will go in the Coprocessor slot.  There are two kinds of bus masters in 
Amiga systems, primary and secondary.  The primary bus master can be the 
on-board CPU, or a device in a Coprocessor slot.  Secondary bus masters are on
the Zorro bus.  The difference is that the primary bus master, which is the
default bus master, is responsible for servicing all interrupts and some 
aspects of bus arbitration.  Zorro devices cannot perform these operations.  
While it's certainly possible to design an OS that can run on a CPU which is a
secondary master (with some assistance from the primary master), the Amiga OS
is only designed to run on the primary master.



-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
   {uunet|pyramid|rutgers}!cbmvax!daveh      PLINK: hazy     BIX: hazy
	"This is my mistake.  Let me make it good." -R.E.M.