Matt J. McCullar wrote:
> I worked on two motherboards for a _Stunt Cycle_ recently. Neither
> had throttle problems. But one of them had a big problem: the black
> ramps weren't present! Instead of the cycle jumping over the buses,
> it would just repeatedly smash into them! ("Super Dave" _Stunt
> Cycle_! Very rare!)
>
> Matt J. McCullar
> Fort Worth, TX
>
>
>
Hi Matt,
As I recall the ramp info is put into a 74193 around the middle of the
last page of the three pages of schematics (/ramp and ramp). If you have
a Video Probe you can put the ramp development circuitry results
directly on the Monitor screen and figure out where it breaks down.
You do know how to make a Video Probe, don't you? Check out the Atari
Big Book or any B&W Atari operator manual for details. Video Probing is
a very fast way to troubleshoot B&W not CPU based games (most times).
John :-#)#
--
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
www.flippers.com
"Old pinballers never die, they just flip out"
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Received on Thu Aug 5 23:59:38 2010
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