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Optical Illusion   [2019]

Optical Illusion Released by :
Rastah Bar

Release Date :
1 February 2019

Type :
C64 One-File Demo

AKA :
Checker Shadow Illusion Preview

User rating:********__  8/10 (7 votes)   See votestatistics

Credits :
Code .... Rastah Bar
Music .... Freeze of Faces


SIDs used in this release :
For Clairvoyant(/MUSICIANS/F/Freeze/For_Clairvoyant.sid)

Download :
http://csdb.dk/getinternalfile.php/178586/optical_illusion.prg (downloads: 100)

Look for downloads on external sites:
 Pokefinder.org


User Comment
Submitted by iAN CooG on 2 February 2019
Nope, fixed version, new entry
Optical Illusion [fixed]
User Comment
Submitted by Rastah Bar on 1 February 2019
Fixed the bug. Thanks, Groepaz!
User Comment
Submitted by Rastah Bar on 1 February 2019
When I set C64 Model in to Old Pal the problem occurs. Man, what a noob I am. Still I don't understand what goes wrong with MC.
User Comment
Submitted by Rastah Bar on 1 February 2019
Groepaz, are you sure?

The checkerboard is in multicolor and I use bitpairs 01 and 10. So the colors are determined by $d022 and $d023. Those are set in the IRQ routines in every frame. The screenshot posted by dano shows a hires checkerboard. This I don't understand because MC is set in the lower border in every frame (and turned off again right below the checkerboard).

There was a similar issue with my Ghosts'n Goblins demo where the colors of the sprites looked wrong in some version of GTK Vice and that can't have anything to do with the kernal routine, can't it?
User Comment
Submitted by Groepaz on 1 February 2019
The problem is that you are clearing the screen unsing kernal, but you dont set $0286 first. so it uses whatever the color was before starting (AR->$01). Next time just dont use the kernal routine :)
User Comment
Submitted by Optic Freeze on 1 February 2019
If you’re going to use my BBS name, at least you could have included the telnet address & port. 馃槝
User Comment
Submitted by Rastah Bar on 1 February 2019
hedning, with AR6/RetroReplay is there a problem with using ram from $8000?
User Comment
Submitted by hedning on 1 February 2019
This should have been a BBS intro, btw.
User Comment
Submitted by hedning on 1 February 2019
Looks fine without fastloader. With AR6/RetroReplay I also got wrong colours.
User Comment
Submitted by Rastah Bar on 1 February 2019
dano, I believe there are some issues with some of the GTK3 Vice versions. The demo looks fine on all emulators I tried it on.
User Comment
Submitted by dano on 1 February 2019
For me this looks like this on x64sc in GTK3VICE-3.3-win64-r35998:

https://ibb.co/R45sBwX
User Comment
Submitted by Golara on 1 February 2019
Haha, Scan, didn't you plan on making a demo with this illusion ?
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CSDb (Commodore 64 Scene Database) is a website which goal is to gather as much information and material about the scene around the commodore 64 computer - the worlds most popular home computer throughout time. Here you can find almost anything which was ever made for the commodore 64, and more is being added every day. As this website is scene related, you can mostly find demos, music and graphics made by the people who made the scene (the sceners), but you can also find a lot of the old classic games here. Try out the search box in the top right corner, or check out the CSDb main page for the latest additions.
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