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Would this 'accelerator' work in a NeXT box?

 
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da9000



Joined: 30 Sep 2006
Posts: 387
Location: Silicon Valley

PostPosted: Fri Jan 12, 2007 6:39 am    Post subject: Would this 'accelerator' work in a NeXT box? Reply with quote

http://amiga.resource.cx/exp/xcalibur

Check out the photos, but most importantly the PDFs that are at the bottom.

The interesting part is that it needs an A3640 to plug into, and I think that's where it gets the clock signal from as well. Now, even though it plugs right into an existing 040 socket, I'm not sure it will work on any 040 machine, because this sucker also has memory on it and perhaps it uses certain of those 040 pins for other things (in a propriatery fashion).

Any ideas from the hardware gurus in here?
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Andreas



Joined: 27 Dec 2005
Posts: 353
Location: Germany

PostPosted: Fri Jan 12, 2007 9:31 am    Post subject: Re: Would this 'accelerator' work in a NeXT box? Reply with quote

da9000 wrote:
http://amiga.resource.cx/exp/xcalibur

Check out the photos, but most importantly the PDFs that are at the bottom.

The interesting part is that it needs an A3640 to plug into, and I think that's where it gets the clock signal from as well. Now, even though it plugs right into an existing 040 socket, I'm not sure it will work on any 040 machine, because this sucker also has memory on it and perhaps it uses certain of those 040 pins for other things (in a propriatery fashion).

Any ideas from the hardware gurus in here?


I don't see the goal here. That piece cures the deadly slow memoryinterface between CPU-card and motherboard (Amiga have designed it to handle a 32 Bit interfdace to the 68030) since it haves its own mem.
I assume, that a Turbonext is times faster than this if it would work.
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da9000



Joined: 30 Sep 2006
Posts: 387
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PostPosted: Fri Jan 12, 2007 8:58 pm    Post subject: Reply with quote

What's the memory bus width of a NeXT box? I thought it was also 32bits wide, not 64bit (or more). But the point is that this card will take an existing 32bit memory architecture (Amiga) and add an 040 with a 64bit interleaved memory bus, so basically producing 4x the memory bandwidth. All this I got from the .pdfs that came with the board.

Of course if the 040 can use that or not, I'm not sure. It's complicated if you don't know the exact setup latency of the memory, burst speed of memory and burst capability of the CPU. I don't Sad Anyways, I was just asking Andreas, not saying I'm going to do it Smile
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Andreas



Joined: 27 Dec 2005
Posts: 353
Location: Germany

PostPosted: Wed Jan 17, 2007 11:32 am    Post subject: Reply with quote

da9000 wrote:
What's the memory bus width of a NeXT box?


I don't know but the transfer figures are the same than with Amiga Turbo Cards and mesured with bustest 0.07 (if i remember correctly)

Take a look at the second diagram (mostly mesured on my machines Smile))
http://www.koplien.de/henry/NeXT/Hardware/MemoryBenchmark.html

The Amiga has also high peeks until ~50MB/s, the same as the turbos with 60ns RAM.
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da9000



Joined: 30 Sep 2006
Posts: 387
Location: Silicon Valley

PostPosted: Fri Mar 16, 2007 4:57 pm    Post subject: Reply with quote

Andreas,

that benchmark link doesn't work :-(

Could you please repost a working one?
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Andreas



Joined: 27 Dec 2005
Posts: 353
Location: Germany

PostPosted: Wed Mar 21, 2007 12:46 pm    Post subject: Reply with quote

da9000 wrote:
Andreas,

that benchmark link doesn't work :-(

Could you please repost a working one?


unfortunatly it looks like its gone. Henry wrote in c.s.n.s
Message-ID: <news:eria9v$iu6$00$1@news.t-online.com>

Hi folks,

if someone is missing the www.koplien.de/henry/NeXT, it has moved to

http://www.famkoplien.de/henry/NeXT/

Reason was a domain grabber who bought the domain in a couple of minutes.
The pages are not refurbished yet, put I nevertheless will put the latest
VideoStream available, if I have sufficient time to do so.

KR
Henry
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Andreas



Joined: 27 Dec 2005
Posts: 353
Location: Germany

PostPosted: Wed Mar 21, 2007 12:49 pm    Post subject: Reply with quote

The picture itself do i found on my own file database:

Andreas wrote:

Take a look at the second diagram (mostly mesured on my machines Smile))



The Amiga has also high peeks until ~50MB/s, the same as the turbos with 60ns RAM.
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da9000



Joined: 30 Sep 2006
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PostPosted: Thu Mar 22, 2007 2:15 am    Post subject: Reply with quote

Cool, thank you Andreas!
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