Re: [WinMac] upgrades

Daniel L. Schwartz(expresso[at]snip.net)
Tue, 25 Jan 2000 11:59:16 -0500

At 07:47 AM 1/25/00 -0600, you wrote:
>On 1/25/00 at 3:11 AM -0800, Dan Schwartz wrote:
>> More importantly - in my opinion - is the I/O subsystem: You
>>can have the
>>fastest CPU, but if it's being tied down by a slow IDE disk then it's just
>>spinning its wheels.
>
>This isn't a reason not to get a G4 upgrade -- it just means that one
>should get a faster hard disk.

        When performing an upgrade, you need to look at the total cost as well as
the amount of TOTAL speed increase... After all, there's more to life than
running Photoshop filters 100% of the time.

>> This is one thing I STILL can't figure out: For years Macs
>>came with more
>>expensive SCSI disk subsystems... Even though System 6 & 7 was NOT
>>multithreaded - And couldn't take advantage of it.
>
>Actually, I think that SCSI Manager 4.3 and the Thread Manager were
>available in System 7.

        WRONG: I'm talking about the whole OS, not just the SCSI subsystem. Unless
you're running linux or OS-X, you don't have a *true* multithreaded OS...
And can't take full advantage of SCSI's command tag queues. Allowing device
disconnect WILL, however, help even a non-multithreaded OS.

>I can't think of any Mac with an "expensive
>SCSI disk subsystem" that shipped with System 6, since the nice
>subsystems started shipping with the PCI PowerMacs...

        WRONG: They started with the AV Quadra's (660AV & 840AV)

>unless you're
>thinking of the Mac IIfx, which did come with hardware that wasn't
>supported by the OS.
>
> --Marc

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