[Duo2400] 2300 speed vs. 280 speed

[David Gass]

FWIW, http://www.cfoutlet.com/29146-00.html still has some copies of Speed
Doubler 8 left for $12. It does make a Duo 2300c seem to run a lot faster.
Bought a copy several weeks ago and was very impressed with the results on a
2300c I was rebuilding.

    David
    dgass at swbell.net
----- Original Message -----
From: "Ivan Drucker" <ivanxqz at yahoo.com>
To: "Duo/2400 List" <DuoList at lists.themacintoshguy.com>
Sent: Sunday, December 08, 2002 10:28 PM
Subject: [Duo2400] 2300 speed vs. 280 speed


> >So I've heard from several people that the 2300c is slower than the
> >280c, anyone know why this is? Being almost the same machine (the 2300
> >has the internal IDE drive which I always thought was faster) with the
> >faster processor, I'd have thought the 2300c was the faster Duo.
>
> First, let's get one thing straight: When running a native PPC
> application which is not extremely disk-intensive, the 2300c is
> unquestionably faster than the 280c running the 68K version of the same
> application, as you would expect. No discussion.
>
> However, disk-related functions, and the Finder itself, perform
> sluggishly. The reason is the lack of DR (dynamic recompilation) in the
> 68K emulator, as is the case with all NuBus-based Macs (and PCI-based
> Macs running 7.5.2). A great deal of Mac OS 7/8/9 is 68K code, and all of
> it has to be emulated to run on the PPC chip. This is true for any 68K
> application, but also true for key chunks of the OS, such as the File
> Manager (!) and parts of the Finder itself, especially on older versions
> of the OS.
>
> The lack of DR (as I understand it) in the emulator means that every 68K
> instruction has to be newly emulated, whereas DR provides signifcant
> performance gains by reusing PPC code generated for already-executed
> instructions. Or something like that. The point is that DR makes
> emulation way faster.
>
> Fortunately, there is a really good solution to this problem, in the form
> of Connectix Speed Doubler, which replaces Apple's 68K emulator with a
> new one that uses DR. If you are using ANY PowerPC NuBus Mac with
> adequate memory, including the 2300c, you MUST run it. It's well worth
> the meg of RAM it occupies. It's been a long time since I've used it, so
> I can't remind myself of how much better it makes things, but my memory
> is that the difference is quite substantial, and enough to eliminate the
> seeming sluggishness of the 2300c. Speed Doubler also has some disk
> caching and file copying improvements for further speed benefit, but I
> never used them.
>
> The bad news is that Speed Doubler is not compatible with Mac OS 9
> (though I think Mac OS 9 is inappropriate for the 2300c anyway due to its
> memory requirements). Also, it's no longer available, and even its
> product updates are no longer available, so I don't know how to tell you
> to (legally) get it. It seems to be available at amazon.co.uk though they
> will only ship to EU countries, as well as
> http://www.softjam.co.uk/acatalog/Boxed_Connectix.html, which doesn't say
> anything about restricted shipping. The latest version is 8.1.2, I think.
>
> Ivan.
>
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