roadblasters graphic issue

[retrocab]

]hi there

my roadblasters has an issue ,vertical stripes on the screen
ram rom test oke
game plays and has sound
any help is welcome
gr robert

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[ajhippel]

try:
remove, clean the legs and insert back again the graphic eproms

[Etienne MacGyver]

Are thos not retrace lines ?

I could be wrong ofcourse, but its worth a shot to turn the screen pot on the flyback a bit down.

[level42]

Nope.

Road Blasters is a horizontal game and retrace lines would show up horizontally.....not vertically like this.



For example:

[anunaki]

huh? I thought the working of a monitor is not based on the orientation of the game played on it?

Isn't it always drawing the lines bases on a vertical perspective?

[level42]

Indeed the working of a raster monitor/CRT TV is always the same: it draws lines horizontally line by line. When it reaches the end of a line the beam is "steered back" to the beginning position while the gun is turned "off" but it can't be turned off completely and when the brightness is too high you can actually see the retrace lines.

https://www.youtube.com/watch?v=dlT-seESkj0


Horizontal on a CRT always means the orientation with the widest distance, vertical the shortest, so....like it would be positioned in a normal TV.

If you turn the monitor or TV on it's side, it still keeps scanning the same way, that doesn't change of course

So...a vertical position monitor could show retrace lines vertically, but Road Blasters is a horizontal game and thus retrace lines would look (mostly) horizontal.

[anunaki]

thx

[mikemcbike]

IMHO it seems not to be only a sprite GFX EPROM issue, because the stripes are also visible on background graphics (road surface for example).

[retrocab]

thnx for the tips
 but sadly nothing further ,stiil that weird stripes

[level42]

If you have a way to verify the graphics ROMs then do that. Use this website to confirm if they match:

http://romident.coinopflorida.com