SCSI speeds

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From - Tue Mar 16 10:19:33 1999
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From: Bill Vermillion <bill@bilver.magicnet.net>
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Subject: Re: SCSI page
In-Reply-To: <36EE473C.70BE83D8@aplawrence.com> from Tony Lawrence at "Mar 16, 99 06:57:48 am"
To: tony@aplawrence.com (Tony Lawrence)
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Tony Lawrence recently said:
> Bill Vermillion wrote:

> > I grabbed a couple of books I have on SCSI - oneis the Adaptec book
> > Understand I/O Subsystems which has a lot of stuff in it.

> Thanks. I'd never seen the 3.5/3.8 before; I always thought it was
> Th5. e 80 MNB on 32 bits was a brain fart that I missed again and
> again.

Thirty two bits was probably a wild-eyed engineers dream. 110
conductor cables is pretty bizarre.  It's probably the old
thinking that parallel is faster.  The fibre channel and SSA have
show that serial is just as fast or faster and that the connectors
at the end of the cable are reasonably priced.

This is most often just evolutionary thinking and I've seen it
in most major products.  As capactity needs go up the devices get
larger and larger until one day someone says - we can do just
as much or more, more efficiently, with several smaller devices
instead of one large device.

The railroads proved that the their mallet engines (the ones with
two steam chests on each side - driving sets of wheels), the
US Airforce one day noticed that instead of tires 8 to 10 feet tall
they could put a few smaller ones to do the same.  About 10 years
ago the local electric company put in what was probably the
last 600MegaWatt Steam turbine ever built.  Now is you need
600MW you buy six 100MW.

> I also noticed that I've got to be more clear in the termination
> section as to whether they have ribbon cables or are are chaining
> external devices, and then I thought of something I missed
> completely, but now I can't remember that!

No matter what any of us do, there's bound to be something that
fits outside the normal realm of affairs.

Today I came to my machine, turned the screen on, and found error
messages scrolling up the screen. System was basically dead.

Reboot gave me memory error.  I have never seen that before on
an iNTEL based PC.  This was after the memory count and during the
BIOS initialization.  First time I recall having that error
pop up since I got my first computer (RS Model I) in 1977.

> Thanks for you comments!

You are entirely welcome.

Bill

-- 
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