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Path: utzoo!utgpu!water!watmath!clyde!rutgers!cbmvax!grr
From: grr@cbmvax.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: The LIVE Digitizer from A-Squared...
Message-ID: <1978@cbmvax.cbmvax.cbm.UUCP>
Date: Sun, 7-Jun-87 05:43:09 EDT
Article-I.D.: cbmvax.1978
Posted: Sun Jun  7 05:43:09 1987
Date-Received: Sun, 7-Jun-87 20:07:30 EDT
References: <8705290639.AA04316@ingres.Berkeley.EDU> <279@l5comp.UUCP> <20462@sun.uucp> <8085@amdahl.amdahl.com>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Organization: Commodore Technology, West Chester, PA
Lines: 27
Keywords: LIVE scottdisk.device speed mount features

In article <8085@amdahl.amdahl.com> kim@amdahl.amdahl.com (Kim DeVaughn) writes:
> In article <20462@sun.uucp>, cmcmanis%pepper@Sun.COM (Chuck McManis) writes:
> > And if you have a MicroBotics hard disk you have to unplug it to use
> >Digi-View sigh.
> 
> Hmmmmm ... MicroBotics advertises that the parallel port "is duplicated for
> simultaneous use with your printer".
> I always assumed they had some kind of "pass-thru" for the parallel port's
> signals.  Is this:
> 	2. correct, but it doesn't work
> 	3. they don't pass/replicate *all* the signals (like +5v)
> 
> Just curious ... I've often wondered how their "daisy-chaining" works.

I'm not sure of the exact circuitry, but what they do is pass through the
signals needed to operate a printer and use one of the infrequently used
control lines to strobe the disk instead of the printer.  Digiview has its
own ideas of which control lines to use for what and isn't compatible.

Life can be rough...  You can only make one port swing so many ways and still
be compatible with the basic least-common-denominator devices that the user
may want to attach.

-- 
George Robbins - now working for,	uucp: {ihnp4|seismo|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@seismo.css.GOV
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)