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- Path: sdd.hp.com!inn
- From: Jeff Grimmett <jgrimm@sdd.hp.com>
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: A3000 SCSI
- Date: 28 Jan 1996 21:55:06 GMT
- Organization: Hewlett-Packard Company
- Message-ID: <4egrbq$kas@news.sdd.hp.com>
- References: <4crkgh$ct6@bmerhc5e.bnr.ca> <4djffa$bau@rapidnet.com> <4dlre0$jad@news.sdd.hp.com> <4e0amr$nph@rapidnet.com> <4e0jru$16d@news.sdd.hp.com> <4edjsc$49v@rapidnet.com> <4egdq5$grp@news.sdd.hp.com> <4eglri$bbj@serpens.rhein.de>
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-
- mlelstv@serpens.rhein.de (Michael van Elst) wrote:
-
- >>First of all, you're missing my point throughout this article. That
- >>being: design specs are one thing, the way the hardware WORKS is
- >>another thing completely.
- >
- >Fortunately this isn't the case for the subject of this discussion: A3000 SCSI.
-
- Well, so much for YOUR reading comprehension.
-
- >>As for the DB25 connector: I think they made a good choice with it, to
- >>tell the truth, in the same way that they made a good choice by using the
- >>standard Centronics port -- that's what was out there, that's what was
- >>supported, and it's the most affordable for both them AND the customer.
- >
- >The DB25 was a bad choice.
-
- OK, I'll play this juvenile game:
-
- "No, it wasn't. So there. Nyah."
-
-
- >>Sure, 50-pins connectors are better from MANY viewpoints, but the things
- >>are EXPENSIVE compared to even top quality DB25 to 50-pin cables.
- >
- >No. They are expensive compared to simple 25-wire printer cables.
-
- Fine. Go make a printer cable work with a SCSI drive. Without hacking
- it. Standard 25-pin to 50-pin SCSI cables are the subject at hand.
-
- >>Ever
- >>price one of the high-density 50 pin cables?
-
- >About the same as the 50-wire cables that you need with the DB25 connector.
-
- Incorrect. As I POSTED, and as you conveeeeeeniently cut out in your
- reply, the same cable made by the same company with the notable exception
- of the connector on the host end costs $15.00 for the DB25 version,
- $60.00 ($66.00 to be precise) for the high-density version. I can give
- you part numbers, manufacturer, AND the name and phone number of the
- stores where you can call and verify this for yourself. I have the
- receipt for the high-density version right in front of me.
-
-
- >Matter of fact is that it a) violates SCSI specs and b) does not work
- >reliably. It is made for printers, maybe for modems, but not for SCSI.
-
- By your own inexplicable reasoning, then, the A3000 is a non-SCSI machine
- because it uses that connector. It (a) violates SCSI specs and (b) does
- not work reliably (as quoted from mlelstv@serpens.rhein.de (Michael van
- Elst)).
-
- >>Not at all. I just don't think you are recognizing the difference between
- >>a specification and the resulting design that comes from one.
- >
- >You seem to prefer something that violates specs and that does not work reliably.
-
- Care to provide proof of that? Aside from something ficticious? Like,
- perhaps, quoted material from myself?
-
- >>> I'm trying to convince people that SCSI works better if
- >>>you follow the rules.
- >
- >>Generally, it does.
- >
- >It always does.
-
- Dream on.
-
- >>For a non-theoretical piece of machinery, it MAY make sense.
- >
- >It makes perfectly sense for real-word machinery.
-
- Dream on some more. Go out and buy a few modems and prove it. (laughing)
-
- >>It's like saying that a technical bulletin issued by Ford applies to
- >>Audis.
- >
- >It's like saying that technical bulletins can be wrong.
-
- Of course, only the ones that you personally agree with could be right?
-
- >>any idea why you can't accept that technical bulletins are a method to
- >>correct mistakes made in design specs,
-
- >There are no mistakes in the SCSI design specs that you would know.
-
- Nor do I claim there are. Perhaps you should stay out of this one, I
- think maybe there's a language barrier or something. That's me being
- charitable.
-
- >>Like it or not, these exceptions must be dealt with on thier own terms on
- >>a case by case basis.
-
- >These have to be handled. But not in the way you suggest.
-
- I suppose we just close our eyes, and wish all the big nasty problems
- away?
-
- >>I do not understand why you cannot accept that exceptions can exist and
- >>must be dealt with on thier own terms.
-
- >That's not a problem. But you insist that the exception renders the SCSI
- >specs and half of the EE theory invalid because some technical builletin
- >suggests you something different.
-
- There you go again. The A3000 isn't the physical embodiment of the SCSI
- Standard and EE theory. To say the A3000 is imperfect is not to say
- either of the others are. You MUST not be understanding this right. NO
- ONE can be this obscure on thier own.
-
- >>Well, since you won't accept the notion that at least early A3000
- >>motherboards had a problem with SCSI bus impendence, and thus requiring
- >>non-standard termination configurations, I sense a trap.
-
- >_No_ A3000 _requires_ non-standard termination configurations.
-
- Oh, sure, if you say so. Wonder why that's not convincing my 3000 of
- anything in particular?
-
- >>don't need to dig too much further. While it claims SCSI-II command
- >>compliance, you can not enable and disable synchronous transfers on a
- >>drive by drive basis.
- >
- >So what ? This is not required by SCSI-II.
-
- Read again, I'm sure you've missed something at this juncture. Your
- demonstrated comprehension ability thus far in this post has NOT given me
- great confidence in your comprehension of other, much more technical,
- documentation.
-
-
-
-