28 May
2010
28 May
'10
6:48 a.m.
Dan Roganti wrote:
Tony Duell wrote:
The Vertical and Horizontal Timebase is detached internally when
switching to X-Y mode. There is no triggering involved. Basically, the
inputs are fed directly into the deflection control for each X axis
and Y axis - much like on a Vector monitor inside the Asteroids
cabinet. So then the voltage input is converted to deflect the beam
up/down or left/right. For those scopes with a Z axis input, this
provides an additional intensity level control to change the
brightness of the beam.
oops, I forgot to finish my thought, sorry about that.
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.
=Dan
http://www.vintagecomputer.net/ragooman/
For just
playing around you can also use an oscilloscope in X-Y
mode... even better if you can trigger off of another input too.
Since a 'scope in X-Y mode doesn't use the timebase, I am wondering
just what is 'triggered' ?