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2017-01-15 13:39

Comos

Registered: May 2004
Posts: 71

Games that use VSP

Firts of all, I wanted to start this thread as a small research,coz during the years I encountered few game titles,that keeps crashing for a not well reason to me,but regarding VSP and especially VSP bug,that few years back was discovered seems it might have an explanation.

Here are titles, that Im aware of,that might use this technique,because of in game random crashes.

Creatures 1,Mayhem in Monsterland, Fred's Back 4

Creatures 1

Crashes mostly during starting of the game,when the screen scrolled horizontaly from right to left.Usually when I pass this, the game runs okay.

Mayhem in Monsterland

Besides, that the use of VSP is well known here I guess, this game crashes rarely during the character movement,atleast in my case.

Fred's Back 4 (Fred's in Troubles)

Maybe it's also related to whole Fred's Back series,but mostly I had problem with the last one.20 years ago,when I played this game, the game crashed for me everytime at the same level at the same place so I considered it as a bad swapper's copy.20 years later,when I wanted to try to finish the game,I tried again the AVT crack,that I had from the beginning,but a copy from csdb,but this time, the game crashed allmost immediately when the first level got loaded.I tested several other cracks,but had the same result.WTF?

The possibilities like kill cart,remove cart, remove everything have been considered,but still no luck.
Does anyone had similar issues or knows more games,that might crash?

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2017-01-18 20:31

algorithm

Registered: May 2002
Posts: 702

Also Phobia by ratt used vsp. Great graphics, what a hard game it was however.

2017-01-18 20:53

Hein

Registered: Apr 2004
Posts: 933

Quote: Also Phobia by ratt used vsp. Great graphics, what a hard game it was however.

Thanks for the tip, looks very cool. Hadn't seen it before.

2017-01-18 21:22

Jammer

Registered: Nov 2002
Posts: 1289

Ok, I figured out it's 49/50th line where magic happens ;)

2017-01-18 21:50

Oswald

Registered: Apr 2002
Posts: 5017

Quote: Only the first badline if it's full-screen. Not each badline.

afaik, VSP can only be done on an idle line, that is either top / bottom border, or tear yourself one with "fld".

caused me big headaches when I wanted a vsp also in the middle of the screen.

basically its a dec/inc d011 iirc, and the horizontal timing of it is where the first screen column should start (or offsetted if you want) around where the dec happens will be column 0.

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