Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!oliveb!amiga!cbmvax!daveh
From: daveh@cbmvax.UUCP (Dave Haynie)
Newsgroups: comp.sys.amiga
Subject: Re: GVP 68030 reviewed in Sentry
Message-ID: <7081@cbmvax.UUCP>
Date: 12 Jun 89 01:58:52 GMT
References: <9831@polya.Stanford.EDU>
Distribution: na
Organization: Commodore Technology, West Chester, PA
Lines: 38

in article <9831@polya.Stanford.EDU>, jwl@Feanor.Stanford.EDU (John Lockhart) says:
> Keywords: A2090, hard drive, DMA, 68030, cache
> Summary: A2090 controller and the 030 cache (...?)

> Um, Dave, I have a CBM A2090 with two ST506 hard drives.  I'm also
> interested in putting a GVP '030 or CBM A2630 on my system to improve
> performance.  Do you know when Commodore will be revising the 2090
> driver to deal with the 68030 cache?

Well, um, er, actually, I'm not sure.  Part of the problem is that the current
methods for this are the singular method of checking for an '030 after the
DMA, and if it's seen, calling a Supervisor() function that'll clear the cache.
Anyone can add that to their driver, but the A2090 driver will undoubtedly be
in for several enhancements, this probably being the least of them.  I suspect
you'll know when the driver's out; I, being a 2090A and '030 user, will
certainly mention it here when it does come about.  

Hopefully in the future we'll have an OS call that fully solves the cache dump
problem.  You can now write code that'll dump an '030 cache, but it's not 
going to help with some great and new external cache, which you may get some
day.  The OS call will work with any possible configuration, '030, external,
'040, whatever.  

> Or, :-(, should I wait for the Amiga 3000?  [I'll probably get one
> eventually anyway...  What will the 3000 have for specs?]

Oh, the usual, names and numbers, like any other machine's specs, only way
cooler....

>   -- John
> 
> -------------------------------------------------------------------------------
>                          -- John Lockhart
>                jwl@feanor.stanford.edu  BIX: jlockhart
-- 
Dave Haynie  "The 32 Bit Guy"     Commodore-Amiga  "The Crew That Never Rests"
   {uunet|pyramid|rutgers}!cbmvax!daveh      PLINK: D-DAVE H     BIX: hazy
              Amiga -- It's not just a job, it's an obsession