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2019-11-04 17:55

Didi

Registered: Nov 2011
Posts: 479

Event id #2889 : Intro Creation Competition 2019

Preface: Please use this thread for questions, discussion and everything else concerning this competition.

Many people were asking about the competition being held this year. It turned out to be a good place to have it after the big X party each second year. But why not give it a try in between?

This time I decided to add a second category to the well known rules: 4kB intro! It is different to the 4kB intro category you know from demo parties. There the executable file has the limit of 4096 bytes and may allocate as much as you like during runtime. Rules here only allow to use 4kB overall for a different challenge. Please check the rules for more details. Result will show if that was a good idea.

Here you go...

Competition runs from November 4th, 2019, until January 5th, 2020. So you have a full 2 months to deliver your creations. This should be enough for an intro.

RULES for both categories:

Your intro entry...
- has to work on a plain stock C64 (PAL standard) without any extensions.
- has to be a one-part intro. Short fade-ins and fade-outs are OK.
- has to contain at least one Logo at whatever size you like.
- has to contain a changing or moving text message (e.g. scrolling text, different lines fading in & out, etc.)
- has to be interruptable any time by pressing SPACE-key (exception are short fade-in and fade-out).
- does not need to have exclusive graphics, charsets or music. But the code should be exclusive, so reuse of existing code with just exchanged graphics and music is not allowed.
- has not been publicly used before entering the competition.
- has to be handed in as executable format startable with RUN (.prg or embedded in .t64 or .d64).

Your 16kB intro...
- has a maximum RAM footprint of $4000 bytes at one block, at whatever location you like. Screen RAM counts as used memory. Exclusions are system addresses like VIC (inkl. Color RAM), SID, CIA, Stack, Zero-page, IRQ vectors. This means RAM besides chosen $4000 bytes area and exceptions has to be the same before and after running the intro. What happens during runtime is up to you.
- has to contain music (not just a humming sound, please).
- is linked to this competition as "C64 Demo" entry (sorry, no other fitting entry exists).

Your 4kB intro...
- has a maximum RAM footprint of $1000 bytes at one block, at whatever location you like. Screen RAM counts as used memory. Exclusions are system addresses like VIC (inkl. Color RAM), SID, CIA, Stack, Zero-page, IRQ vectors. This means RAM besides chosen $1000 bytes area and exceptions has to be the same before and after running the intro. What happens during runtime is up to you.
- does not have to contain any sound, but feel free to add some.
- is linked to this competition as "C64 4k Intro" entry.

You are allowed to enter maximum 3 entries per participant and category, so you are can enter 6 entries at best. Entries might be taken back from the compo until deadline. That means if you want to remove one of your works from the compo to make space for another entry from you, this can be done until deadline.
Deadline for entry submission is Sunday January 5th, 2020 at 23:59:59 (11:59:59 pm) CET.
Voting closes at Sunday January 12th, 2020 at 23:59:59 (11:59:59 pm) CET.
Voting platform is CSDb (with all disadvantages it may have), therefore entries have to be posted here.
Entries will be ranked by weighted average of CSDb votes. Entries with the same weighted average are ranked by their percentages of 10s, 9s, etc.

No prices to win, just the fame. May the best creation win!

... 173 posts hidden. Click here to view all posts....

2019-11-29 13:13

MCM

Registered: Apr 2018
Posts: 21

I am hard working on a 4k intro, it looks nice so far.
But i have a question about that screen ram counts as used memory rule.
The intro has a footprint from $0800-$17ff right now.

I am writing something like 160 Bytes to Screen ram for a Logo and some text.
the rest will be filled with $20 or $00 at setup.

Should i substract only these 180 bytes from the footprint or
the whole screen ram from $0400-$07e7 ? ( I am using only line 1-15 and line 18 so far ).

I like to have sum more bytes to add more effects. ;)=

2019-11-29 13:47

Didi

Registered: Nov 2011
Posts: 479

@MCM: RAM area will be counted as used from first used byte to last used byte in one block. But you are allowed to buffer the used area somewhere else at start and restore it on exit so it appears untouchted.

2019-11-29 14:54

Golara
Account closed

Registered: Jan 2018
Posts: 212

Quote: I am hard working on a 4k intro, it looks nice so far.
But i have a question about that screen ram counts as used memory rule.
The intro has a footprint from $0800-$17ff right now.

I am writing something like 160 Bytes to Screen ram for a Logo and some text.
the rest will be filled with $20 or $00 at setup.

Should i substract only these 180 bytes from the footprint or
the whole screen ram from $0400-$07e7 ? ( I am using only line 1-15 and line 18 so far ).

I like to have sum more bytes to add more effects. ;)=

As I understand the rules, you can have screen at some other memory than your main program (for example the default screen at $400 while the intro is $3000 - $3fff) and only the bytes wasted by your logo or other graphics would be counted, but you can't expect the rest of the screen to be blank! If the intro was linked with a game or something that memory would be "random" and you'd possibly get garbage on the screen

2019-11-29 15:52

Smasher

Registered: Feb 2003
Posts: 512

Quote:

As I understand the rules, you can have screen at some other memory than your main program (for example the default screen at $400 while the intro is $3000 - $3fff) and only the bytes wasted by your logo or other graphics would be counted, but you can't expect the rest of the screen to be blank! If the intro was linked with a game or something that memory would be "random" and you'd possibly get garbage on the screen

AFAIK it means:
- if you use $3000-$3fff for your intro you can simply set your screen RAM inside that area, e.g. at $3400. end of the story
- if you use $0400-$07ff (incl. sprite pointers, etc) for your screen RAM you can use $3400-$3fff for your intro. I think that's allowed by Didi's rules (but I could be wrong). you could even use $3000-$3fff but you need a way to save existing $0400-07ff somewhere first and restore that area at press space.

2019-11-29 16:15

Golara
Account closed

Registered: Jan 2018
Posts: 212

Quote: Quote:
As I understand the rules, you can have screen at some other memory than your main program (for example the default screen at $400 while the intro is $3000 - $3fff) and only the bytes wasted by your logo or other graphics would be counted, but you can't expect the rest of the screen to be blank! If the intro was linked with a game or something that memory would be "random" and you'd possibly get garbage on the screen

AFAIK it means:
- if you use $3000-$3fff for your intro you can simply set your screen RAM inside that area, e.g. at $3400. end of the story
- if you use $0400-$07ff (incl. sprite pointers, etc) for your screen RAM you can use $3400-$3fff for your intro. I think that's allowed by Didi's rules (but I could be wrong). you could even use $3000-$3fff but you need a way to save existing $0400-07ff somewhere first and restore that area at press space.

You need to save the original screen, so if your intro is $3400-$3fff and you want to use screen $400, copy it to $3000 first. Then you have the full 4kb with no gaps

2019-11-29 16:31

Smasher

Registered: Feb 2003
Posts: 512

mmmh, ya rite, I forgot about the "at one block" rule.

2019-11-30 18:15

Rudi
Account closed

Registered: May 2010
Posts: 125

quote: "has a maximum RAM footprint of $4000 bytes at one block"

Does that mean code and data (graphics and music), i.e. everything has to fit within that area except usae of VIC and SID-registers and so on?

2019-12-01 09:06

TheRyk

Registered: Mar 2009
Posts: 2070

pretty much yes if "so on" means complete I/O, zeropage and stack plus SYS-line

2019-12-01 19:22

MCM

Registered: Apr 2018
Posts: 21

Quoting Didi

@MCM: RAM area will be counted as used from first used byte to last used byte in one block. But you are allowed to buffer the used area somewhere else at start and restore it on exit so it appears untouchted.

Hmmm... so „buffer the used area somewhere else“ could be a simple
code like this :

Ldx#00
Lda 0400,x
Sta 8000,x
Lda 0500,x
sta 8100,x
Lda 0600,x
Sta 8200,x
Lda 0700,x
Sta 8300,x
Inx
Bne xx
...

The run the intro, after pressing space like this , to get back the whole ram like it was before :
Ldx#00
Lda 8000,x
Sta 0400,x
And so on ..

Then
Lda 7000,x
Sta 8000,x
And so on. This fills up the area $8000-$84ff with the random ram filled stuff like it was before, then just a simple jump $fce2 ?

Whole intro code incl. graphic stuff still will be from $0800 - $17ff, all the time.Plus some bytes ( 180—200) in screen ram for logo and text only while running.

2019-12-01 23:31

0xDB

Registered: Aug 2015
Posts: 27

If you use RAM outside your chosen block, you have to store/restore that RAM inside/from your chosen block as well. You can't just store it somewhere outside your block because then you'd overwrite something else there.

In other words: If you chose 0800-17ff any RAM from the default screen RAM will have to be stored into that range, if you want to use the default screen RAM for something else. But... it would seem wasteful, why not just use a different screen RAM?

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