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From: augi@cbmvax.commodore.com (Joe Augenbraun)
Newsgroups: comp.periphs.scsi
Subject: Re: Handling errors with 33C93
Message-ID: <17786@cbmvax.commodore.com>
Date: 18 Jan 91 15:54:09 GMT
References: <1866@atlas.tegra.COM> <1990Dec24.184704.3376@Solbourne.COM>
Reply-To: augi@cbmvax.commodore.com (Joe Augenbraun)
Organization: Commodore, West Chester, PA
Lines: 51

In article <1990Dec24.184704.3376@Solbourne.COM> taylor@Solbourne.COM (Dick Taylor) writes:
> In article <1866@atlas.tegra.COM> vail@tegra.COM (Johnathan Vail) writes:
> >
> >The data sheet isn't too clear and I don't have any AP-notes.
> >
> 
> For bug lists and application notes, call WD support directly, and ask
> for their applications engineering folks.  I've had mixed results with
> error debugging with these people, but I've never gotten anything but
> good cooperation at getting information, _once_I_knew_what_to_ask_for_.
> 

I thought it might help some people if I posted what I know exists as far
as documentation for the 33C93.  I had to visit WD once to debug a problem
we had when switching from the 33C93 to 33C93A, and was shocked to see the
amount of material that was available that we never knew about.  Here's what
I snarfed from them during that visit last year:

	WD33C92A/3A SCSI BUS.  Interface controller programmer's ref guide
	Miscallaneous tech briefs
	Bug list for each rev part that has shipped to customers
	WD33C92 and WD33C93 SCSI bus interface controller starter kit, v1.0
	WD33C92A/WD33C93A App. Notes, preliminay, October, 1989, rev. 2

In addition, there exists a data 'sheet' and preliminary spec for WD33C93
and WD33C93A.  There are at least 10 revs of the 33C93 and 33C93A of which
I am aware.  These are known as XA, XB, XC, etc.  Some have shipped to
customers, some are purely internal.  If I remember   right the rev number
is printed numerically as the second field on the line after the part number.
For example the chip in front of me is marked {1st line}WD33C93A-PL /
{2nd line}00-04 8940.  This would be an XD version of the 33C93A because
of the 04 in the second line.  Another part I have is marked
{1st line}(c)WDC'85 / {2nd line}WD33C93-PL / {3rd line}00-02 8736.  This
is an XB WD33C93.  On the underside of the chip, original 33C93's will
start with 3393.  They then did a die shrink, and these chips are marked
4393.  33C93A's are marked 5393 in this position.  Theoretically no 4393's
were ever shipped to customers.  I think I've seen some chips with the
rev number printed on the underside instead of the top.

Oddly enough, this was difficult information to extract from WD.  I hope this
helps someone.

							Joe

-- 
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I'm a member of DAD, "The American Dislexics Association"
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Joe "Augi" Augenbraun                   ucp: {uunet|ihnp4|rutgers}!cbmvax!augi
System Engineering                     	arpa: cbmvax!augi@uunet.uu.net
Commodore Business Machines		Phone: 215-431-9332