Oh No!!! Rolling vertical picture on Wonder Boy?

[blackdalek]

Help! I just turned my CPC on and loaded up Wonder Boy.
As soon as the main game screen loads, I get a rolling screen like the vertical hold is gone.
So far this only happens with Wonder Boy that I have discovered.This issue has never occurred for me with this game before today.

I'm trying to attach a video below...

I tried this using a dsk image downloaded from CPCPower and also my own original disk, both gave the same result. And I know both the dsk image and my own copy worked perfectly last time I used them.

So that rules out being a software problem. Which part of my hardware has gone bad?

[ASiC]

You probably have already done that but, have you tried the vertical hold pot in the back of the monitor to see if you can stabilise the image?


I remember wonderboy being a little bit weird as I could hear the monitor's electronics whining while playing it (Sigma 7 and Turrican 1 opening screen as well).

[DanyPPC]

Try to use a standard RGB TV Monitor like a Commodore 1084S or Philips 8833 mk2, obviously you need cables and power adaptor.

[blackdalek]

I had completely forgotten there was a V-Hold pot on the back of the monitor.
A simple twist fixed the issue. Hurrah!
I was scared my CRTC had gone bad for a while there. Thanks.