Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!voder!pyramid!cbmvax!cbmehq!babylon!rbabel
From: rbabel@babylon.UUCP (Ralph Babel)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: GVP Trade-in
Message-ID: <03347.AA03347@babylon.UUCP>
Date: 30 Aug 90 15:00:49 GMT
References: <589@oregon.oacis.org> <38CP09P@dri.com> <02048.002057@thiger.UUCP>
 <83242@tut.cis.ohio-state.edu> <1143@mpirbn.mpifr-bonn.mpg.de> <03259.AA03259@babylon.UUCP>
 <03283.AA03283@babylon.UUCP> <1898@lpami.wimsey.bc.ca> <02102.123056@thiger.UUCP>
 <02109.124
Lines: 64

In article <02102.123056@thiger.UUCP> skraw@thiger.UUCP
(Stephan von Krawczynski) writes:

>> You are completely wrong in this. Not only is DMA faster,[...]
>
> right, but bus-arbitration breaks it completely up.

Even if this was true (which it isn't): DMA to GVP's onboard
expansion memory doesn't require bus-arbitration.

> i have seen no dma-controller yet, that didn't have problems.

Try GVP's.

In article <02109.124951@thiger.UUCP> skraw@thiger.UUCP
(Stephan von Krawczynski) writes:

>>> 1. GVP does not DMA to amiga-memory.
>>
>> Not true, GVP does full DMA!
>
> which gvp?

Aren't we talking about GVP's latest ad?

> in fact, we both know that the processor cannot run into
> problems having about half of the DMA-cycles (to chipmem)
> available in the system.

DMAF_BLITHOG?

> btw, if you dma to fast-mem, is the processor able to
> access it at the same time?

As far as I know, DMA - once it has the bus - is able to
lock out the processor for as long as it wishes to.

In article <02116.135633@thiger.UUCP> skraw@thiger.UUCP
(Stephan von Krawczynski) writes:

> password-protection for each partition?

Design decision, I don't consider this important. It's a
matter of taste - you won't implement other features.

>> driver automatically executing out of 32-bit memory
>
> the rest from rom, we couldn't find a difference, sorry,
> we could not.

Did you ever run "PerfMon" during "DiskPerf"?

> 3 = ALF3 supports it (out yet)

You forgot to tell them about the price for this board: 795
German Marks for the bare SCSI controller, no memory
expansion option. At the current exchange-rate, that's about
twice as much as you would pay for GVP's board.

Best regards,

Ralph

"Any argument carried far enough will end up in semantics."