28 May
2010
28 May
'10
3:30 p.m.
Date: Fri, 28 May 2010 14:33:40 -0700
From: eric at brouhaha.com
To:
Subject: Re: asteroids board
Dan Roganti wrote:
Hey Dan,
what?
Never in my life saw that, Z is always DC, specified as positive signal decreases
intensity. Tube will stay dark all day long with voltage applied, its not cap coupled.
Randy
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The Z axis blanking is internal to the asteroids board, you wouldn't
need any external triggering. That circuit shuts off the beam during
retrace -- that's as along as the scope has a Z input.
Note that most
oscilliscopes that have a Z input use capacitive coupling
on that input, which is generally not very useful for a computer (or
videogame) display.