Bell & Howell Apple II update

From: Christopher Smith <csmith_at_amdocs.com>
Date: Thu Jan 24 10:01:25 2002

> -----Original Message-----
> From: ard_at_p850ug1.demon.co.uk [mailto:ard_at_p850ug1.demon.co.uk]

> You do realise that BNC connectors were used for RF and video

Well, it stands to reason, I suppose.

> applications long before there was any form of ethernet, I
> take it. The
> video ones are likely to be '75 Ohm' characterisic impedance,
> so you'd
> have to get the right plugs to fit them. 50 Ohm plugs will
> fit, but the
> larger centre pin will spread out the contacts on the socket.
> And anyway
> you'll have an impedance mismatch. I doubt you'd notice the slight
> ringing from that on the screen, but it never hurts to do
> things right.

I have a 50-75 ohm converter, I believe. I'll need to dig it up.

> it's separate outputs for the standard (40 column) video from the
> motherboard and for video from an 80 column expansion card.

Hadn't thought of that.

Chris


Christopher Smith, Perl Developer
Amdocs - Champaign, IL

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Received on Thu Jan 24 2002 - 10:01:25 GMT