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VSP&IK+   [1987]

VSP&IK+ Released by :
The Mean Team

Release Date :
30 October 1987

Type :
C64 One-File Demo

User rating:*********_  8.8/10 (9 votes)   See votestatistics

Credits :
Code .... JCB of The Mean Team
Music .... Rob Hubbard
Graphics .... Dokk
Text .... JCB of The Mean Team

SIDs used in this release :

Scrolltext and other text in this release : ()
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User Comment
Submitted by Graham on 7 September 2015
"From what I remember it was a bugged FLD routine..."

This one might have been an inspiration: Bop'n Rumble +2F

Also contains a broken FLD routine which "accidently" does linecrunching which is quite similar to VSP.
User Comment
Submitted by STE'86 on 6 March 2011
I had forgotten all about gallery 2 till i loaded this today :)
thinking about it, there would not have been anything new to actually put in it!
User Comment
Submitted by JCB on 6 March 2011
From what I remember it was a bugged FLD routine that started to make the screen move around and when I realised that might actually be controllable I started trying to stabalise it then found out that 1 cycle would move the screen 1 character.

Gallery 2 never got released, I think VSP&IK+ was the last thing I did on C64 as I'd moved on to game coding and didn't have time to do much else.
User Comment
Submitted by Clarence on 6 March 2011
JCB, 2 more questions if you don't mind

- Do you remember the process of finding out the VSP trick? Was it totally by coincidence or something more conscious thing.

- Was the referred in scrolltext "Gallery two MT" demo ever released (can't find here)?

User Comment
Submitted by STE'86 on 6 March 2011
right i've had a look my VIC is:
6569R3 with a sub serial of 1685
User Comment
Submitted by JCB on 6 March 2011
1) Not sure, I don't have my C64 any longer :( (Ste has his and he's going to check the chip number) I have a feeling it was an "old luma" chip though as colour bars etc look more correct in VICE like that..

Never had any negative feedback about it from Compunet or any people we were in contact with. Maybe it was on later chips the problems started as I doubt Mayhem in Monsterland would've got the green light if it was a widely known bug?

2) It was probably a simple attempt at a bit of obfuscation ;) Can't really think of any other reason (my memory is too bad to remember any actual reason). We did used to suffer from our code appearing in multiple demos a week or so after we uploaded anything, probably because I used to code in a monitor so routines were all nicely spread about in RAM :)
User Comment
Submitted by Conrad on 6 March 2011
A couple of questions I want to ask JCB regarding this classic:
1.) What VIC version was your C64 at the time of writing this? Since there are some models that don't support VSP, would be interesting to know and the feedback you got from Compunet due to different VIC revisions at the time.
2.) Any particular reason for using registers $D300-$D32E than the usual $D000-$D02E? :) ... or just sheer coincidence?
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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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