Re: Goodbye AppleDesktopBus

[Jon Co <jon@tridel.net>]

remember my post a few months back about smoke coming out from my GS?
that was an ADB cable I was using and it worked for a few weeks with no
problem till that incident.  since then I have used an authentic ADB cable

Bradley P. Von Haden wrote:

> dalloff@freenet.columbus.oh.us (Dave Althoff) wrote:
>
> >While there may ultimately be difficulty in obtaining ADB devices
> >(not for a while, but we Apple ][ people have to take a decidely
> >long-term view of this sort of thing...) if you are looking for
> >cables and connectors, that should not be a problem as the
> >connectors are the same as those used for S-VHS video.  *THAT*
> >will be around at least until 2006.
>
> While the connectors on ADB cables and S-video cables (no such thing
> as S-VHS cable) are the same, the wiring inside is not.  Here is an
> old post from Derek Taubert from my archives:
>
>     From: derek@slab.isdn.uiuc.edu (Derek Taubert)
>     Newsgroups: comp.sys.apple2
>     Subject: Re: Desktop case: phase 1
>     Date: 28 Jun 1996 00:12:15 GMT
>
>     S-Video has two signals which both need individual 75 ohm
>     transmission lines.  The other 2 pins are ground, and connected to
>     the shielding around the two signals.  So in an S-Video cable you
>     have two coax cables, while an ADB cable has 4 individual wires.
>     The shielding of the 75 ohm lines will most likely be isolated
>     from each other, so you do actually have 4 separate current paths
>     (so it MIGHT work), but the crosstalk and impedance is likely to
>     mess up the ADB digital signal.
>
>     Just buy the right cable for the job.  I'm sure you can find a mac
>     place that sells exactly what you're looking for.
>
>     --
>     Derek Taubert - http://slab.isdn.uiuc.edu/~derek
>     taubert@uiuc.edu - NeXTMail welcome
>     * Check out TCP/IP for the Apple IIgs!
>     * http://www.winternet.com/~taubert/gstcp.html
>
> **** bpvh        Internet: bpvh@primenet.com        Delphi: bpvh ****
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