RE: Testing XY games on oscilloscope

Now that I think about it - this question wasn't much of a challenge. I
went home and pulled out a spare 74LS04 and wired up +5v and ground to it.
Hooked the game into pin #1 and scope into pin #2. That's all it took.
Played asteroids for a few minutes and then went back to work.

Well - hopefully my simple question gave some other people ideas.

Matt

> -----Original Message-----
> From: owner-vectorlist@lists.cc.utexas.edu
> [mailto:owner-vectorlist@lists.cc.utexas.edu]On Behalf Of Joel
> Rosenzweig
> Sent: Thursday, November 18, 1999 8:04 AM
> To: vectorlist@lists.cc.utexas.edu
> Subject: Re: Testing XY games on oscilloscope
>
>
> When I used a scope for this purpose, I used a TTL inverter, anything you
> like in the 7400 series. They don't require any additional circuitry to
> run, only power and ground. They are dirt cheap, and you can buy them at
> any electronics store.
>
> Joel-
>
>
>
> -----Original Message-----
> From: Matt Rossiter - Verio Southern California <matt@rossiters.com>
> To: vectorlist@lists.cc.utexas.edu <vectorlist@lists.cc.utexas.edu>
> Date: Thursday, November 18, 1999 5:46 AM
> Subject: Testing XY games on oscilloscope
>
>
> >I do almost all of my board testing on the bench now with either a small
> >5" tv for raster games or an oscilloscope for XY games. I try to use up
> >as little space as possible.
> >
> >I have one question about using the oscilliscope with XY games. My
> >oscilloscope has a Z input as well as an XY. When I hook up the Z probe
> >to the game the display goes completely blank. My roomate suggested that
> >I probably need to invert the signal in order to get the display I'm
> >looking for, which is the game without the retrace lines. He
> says that it
> >should be relatively simple to invert the signal with a transistor and
> >maybe a couple of resistors.
> >
> >So - again - before I reinvent the wheel - does anyone already use a
> >device that does this? Maybe some kind of inverter with a coax connector
> >- or does anyone have something they've already tried in terms
> of removing
> >the retrace lines on an oscilloscope?
> >
> >The main reason I want this is so that I can read errors during the built
> >in self tests.
> >
> >
> >Thanks....
> >
> >
> >Matt
> >
> >
> >
> > V E R I O
> > Orange County . Los Angeles . San Diego
> >_____________________________________________________________________
> >
> >Matthew J. Rossiter email: mrossiter@verio.net
> >Customer Services Engineer http://socal.verio.net
> >8001 Irvine Center Drive Phone: 800.273.5600
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> >_____________________________________________________________________
> >
> >
>
>
Received on Thu Nov 18 18:39:05 1999