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From: dale@boing.UUCP (Dale Luck)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: 14Mhz 68000
Message-ID: <995@boing.UUCP>
Date: 16 Jun 91 15:09:42 GMT
References: <7ABF45A76060644B@BNANDP51>
Reply-To: dale@boing.UUCP (Dale Luck)
Organization: Boing, Milpitas, Ca.
Lines: 43

In article <7ABF45A76060644B@BNANDP51> DET1@BNANDP51.BITNET writes:
>
>        I saw not long ago a message asking help for installing a double
>frequency cpu in the Amiga.
>We plan to use a 68010-16 and follow the instructions of a schematic found on
>an archive from this newsgroup.
>        My question is (to all of you) : does anyone have the 68000-16 working
>in his amiga ?

I have an AdSpeed in an A500 we are evaluating to see if it is a more
cost effective accelerator for X-Window type work then any of the
other accelerators. It is very inexpensive compared to other accelerators
that require extra ram. So far it is quite promising in terms of speed.

We bought two for evaluation, one for an A500 and one for an A2000.
One of them however would not work in the A500 so we've sent it back
and are waiting for a replacement to try out.

One of the nice things about this board is it's 16kbs of cache. It
caches all fastmem accesses and watches the bus for any external
dma to fast memory to invalidate it's internal cache if necessary.
I don't believe it cares whether the fetches are data or code so
cache control software should not be necessary.

I believe it is has a write through cache so all writes are sent
to regular memory. It is just reads that may be serviced from the
cache memory.

It could be a real winner, especially in systems that have C00000
halffast memory since the cached reads would no longer hit the
chip bus when accessing that memory.

Hope it speeds up serial interrupt response as well. We are trying
to get a reliable 19.2Kbaud Compressed slip connection to work
at the same time.

We'll let you know how it goes. If anyone else has any stories
they would like to send me about their Adspeeds, working or not,
please email me.

-- 
Dale Luck     GfxBase/Boing, Inc.
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