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My 2008 Christmas Demo (in progress)


Rybags

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Well, a rush job here.

 

KJmann (Sal) very kindly did a song for me, it plays equally well in stereo or mono.

 

I was hoping to have my enhanced software mode up and running properly but it's still got a bit of work to go. So, instead I've done a quick picture in an older mode I was working on (interlaced GTIA colour with 6 available luminences with some restrictions).

 

Sounds best on NTSC, probably looks best on PAL. Looks a bit ordinary (pic) in the emulator but shows up nicely on a real machine on a TV.

48K or more RAM required.

 

XMAS2.zip

 

NOTE: Press SPACE to toggle between a static or "interlaced" look to the picture.

Edited by Rybags
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It should work in NTSC mode if you Load Executable.

 

I took out the part that delays 1 frame at the start, don't know if that broke it.

 

Works fine on my real PAL machine. For some reason I can't load it without running in DOS 2.5 in the emulator to fix it (crashes irrespectively).

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No idea. Sometimes the emulator gets it's Registry settings screwed up and you need to clear them then start from scratch.

 

It's just a normal Binary file.

 

Load segment at $600-6FF, a quick Init routine just switches BASIC off.

Then loads the RMT stuff around $3100-46FF, then the picture stuff from $5600-9BFF and A000-BEFF. Then runs at $5700.

 

Getting late here so I can't really do any more work on it.

 

Seems to load and run fine on the real machine in DOS 2.5.

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Hmm... don´t know why, but the XMAS2 now didn´t work, like miker wrote.

 

First try gave me the picture plus the music.

 

I think you have a liottle to much done in DLI. Try to shorten the picture for some lines, the ATARI rolls, as if the there is not enough time to do the last commands of the DLI/VBI.

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Hmm... don´t know why, but the XMAS2 now didn´t work, like miker wrote.

 

First try gave me the picture plus the music.

 

I think you have a liottle to much done in DLI. Try to shorten the picture for some lines, the ATARI rolls, as if the there is not enough time to do the last commands of the DLI/VBI.

 

Probably a simple bug? As we might know that the last line (scanline 240) that is shown on the TV set is hires (as is with GTIA Mode) , the screen rolls.

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Not in the emulator though.

 

I think I've got the problem with mine sniffed out. The program and pic overwrite whatever Display List is active at the time. Problem is, it's "garbage" so far as Antic's concerned and causes lots of DLIs to trigger.

 

What that means is that DLIs are happening way too much, and the Stage 2 VBlank gets skipped which means that the new DList pointer doesn't get plugged into Antic. Stack overflows and crashes the machine.

 

I'll try and get a fixed one going soon - I want to put this away so I can work on the New Years stuff. I'm not really happy with the picture but will try and improve it a bit then just leave it at that.

Edited by Rybags
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OK, fixed problems, enhanced the pic a bit and added a sound meter.

 

This will likely be as far as I go with it, unless some sort of nasty bug reports surface.

 

Set emulator to stereo before loading for better music. Pressing SPACE toggles the "interlace" effect.

 

XMAS5.zip

 

post-7804-1230540143_thumb.jpg

 

Once again, big thankyou to Sal (kjmann) who specifically did the music for me.

Edited by Rybags
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