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From: rusty@vertigo.UUCP (M.W.HADDOCK)
Newsgroups: comp.sys.amiga
Subject: Re: Commodore 68020
Message-ID: <177@vertigo.UUCP>
Date: Tue, 17-Nov-87 09:55:31 EST
Article-I.D.: vertigo.177
Posted: Tue Nov 17 09:55:31 1987
Date-Received: Thu, 19-Nov-87 23:21:53 EST
References: <5338@cisunx.UUCP> <2801@cbmvax.UUCP>
Reply-To: rusty@vertigo.UUCP (91341-M.W.HADDOCK)
Distribution: na
Organization: AT&T Consumer Products Laboratories
Lines: 39
Summary: How CSA does their memory

In article <2801@cbmvax.UUCP> daveh@cbmvax.UUCP (Dave Haynie) writes:
>in article <5338@cisunx.UUCP>, ejkst@cisunx.UUCP (Eric J. Kennedy) says:
>> 
>> Also, I seem to remember reading that CSA's Turbo-Amiga has a 12 Meg
>> limit of 32 bit memory.  How does that work?  Just what are the limits
>> with a 32 bit system?  
>
>The 68020 is limited to 4 gigabytes, but real-life systems don't give you all
>that much.  Our card doesn't offer 32 bit expansion, just the 2 megs on the
>card.  I think CSA sticks their memory outside of normal autoconfiguration
>space, perhaps up above the 68000 24 bit addressing limit.  CSA provides an
>add-on extension connector on their board, but no on-board RAM.  If they're
>limited to 12 meg of expansion RAM, that's a limitation of their specific
>implementation, not of the Amiga system as a whole.
>
I've had a Turbo-Amiga ever since CSA's first expansion boxes came out
and I've never heard of a 12-Meg limit.  Oh, maybe you mean their Turbo-Tower
which has more slots.  Yes, I just checked and it has 7 Zorro slots so
alloc' 1(one) for the '020 card and the remaining 6 for their 2-Meg static
RAM cards.  At least the my memory cards, Zorro I form-factor, 32-bits
wide data & address, attach to the CPU card via very short ribbon cables
along the sides of the card.  The memory starts at address 0x7f000000,
well above the 68000's address and autoconfig range.  Since I haven't
seen the Turbo-Tower, which is different from the original Turbo-Amiga,
(where do they git these names? :-) I don't know how they may be working
things now.

If you want to know more I'll be glad to answer any questions.

					-Rusty-

DISCLAIMER: I am not connected with CSA 'cept as a satisfied customer.
My problem is that I doubt I could go back to a lowly, 7.16-MHz 68000 Amiga.
Speed withdrawl symptoms, don't ya know...  :-)
-- 
Rusty Haddock {{uunet!likewise!}cbosgd,rutgers!moss}!vertigo!rusty
AT&T-IS Consumer Products Laboratories - Human Factors Laboratory
Holmdel, New Joysey  07733		(201) 834-1023
     -- Being schizophrenic is better than living alone. --