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From: daveh@cbmvax.cbm.UUCP (Dave Haynie)
Newsgroups: net.micro.6809,net.micro,net.micro.atari16,net.micro.amiga
Subject: Re: Re: New CoCo-III's Market Niche (long)
Message-ID: <612@cbmvax.cbmvax.cbm.UUCP>
Date: Mon, 11-Aug-86 13:17:14 EDT
Article-I.D.: cbmvax.612
Posted: Mon Aug 11 13:17:14 1986
Date-Received: Tue, 12-Aug-86 17:17:02 EDT
References: <4286@gatech.CSNET>
Organization: Commodore Technology, West Chester, PA
Lines: 40
Xref: mnetor net.micro.6809:506 net.micro:5813 net.micro.atari16:1565 net.micro.amiga:4219

> Xref: cbmvax net.micro.6809:186 net.micro:1300 net.micro.atari16:1502 net.micro.amiga:2102
> 
>>Has TRS announced an MMU chip for the CoCo-III?  Last I heard, none of the 
>>6809 suppliers (Motorola, Hitachi, etc.) had.
>  
> I assume that you must be disqualifying the 6829 (or was it the 6839)
> memory management chip for some reason. This chip provided expanded
> memory and protection for multiple processes on the 6809. It's also
> cheap (about $5 a piece).

I had heard that they were dropped.  But I've heard more on the CoCo-III;
they are using a custom glue chip that does the video display and the
memory mapping.  The best information says that this chip manages 512K
bytes of memory in 8K segments, compatible with the OS-9 specifications
for memory management (level II).


> The figuring is that why should you stifle yourself with an 8-bit
> processor and banking memory when for close to the same money you can
> go with a 68008, use your 8-bit peripherals, have a 20-bit linear
> address space and the 68000 instruction set.

Why not buy a 68000 (for around $5 a piece), use your 8-bit peripherals, 
have a 24-bit linear address space, a 16 bit data bus, and the 68000 
instruction set?  A good deal, for the price of a discontinued MMU chip.

> -- 
> Jeff Lee
> CSNet:	Jeff @ GATech		ARPA:	Jeff%GATech.CSNet @ CSNet-Relay.ARPA
> uucp:	...!{akgua,allegra,hplabs,ihnp4,linus,seismo,ulysses}!gatech!jeff
-- 
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Dave Haynie    {caip,ihnp4,allegra,seismo}!cbmvax!daveh

	"I gained nothing at all from Supreme Enlightenment, and
	 for that very reason it is called Supreme Enlightenment."
							-Gotama Buddha

	These opinions are my own, though for a small fee they be yours too.
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