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Released At :
Gravity 1997
Achievements :
C64 Demo Competition at Gravity 1997 : #2
Credits :
SIDs used in this release :
Download :
Look for downloads on external sites:
Pokefinder.org
User Comment
Submitted by KAL_123 on 13 October 2022
| What actually happened to that story? Couldn't he find the disks with the sources? |
User Comment
Submitted by Jammer on 23 June 2022
| @BiGFooT: do you mean transfer loop in very loader? |
User Comment
Submitted by KAL_123 on 22 June 2022
| @Jammer, that would be cool. |
User Comment
Submitted by Jammer on 22 June 2022
| Volcano said he might try to fix things as soon as he finds disks with sources :) |
User Comment
Submitted by BiGFooT on 22 June 2022
Not sure if we can move this discussion to the forum.
Are we sure that the problem is related to drive seeking or wobbling? If I remember correctly, we had issues with K.M.'s loader in Lone Star and the ultimate fix was the change in the transfer loop. It's a single cycle too tight and because of that, the loading sometimes failed. |
User Comment
Submitted by chatGPZ on 22 June 2022
| MMMh. First i thought it worked in VICE.... but no :) |
User Comment
Submitted by PiCiJi on 13 June 2022
1541-II:
crashed 4 of 10 times at the same moment, mentioned earlier in youtube movie at minute 8 (screen freezes)
emulation without stepper delay or previous track alignment:
crashes always at the same moment like original (but crash to basic)
emulation with stepper delay or previous track alignment:
behaves like original |
User Comment
Submitted by Jammer on 13 June 2022
| @PiCiJi: I'm asking more about specific demo part, not quite technical reason for crash. You've stated that 4 launches per 10 on real HW/drive do crash. Is it same moment all the time? Is it the same moment it crashes in emulator or different one? |
User Comment
Submitted by PiCiJi on 13 June 2022
In emulation, the track change is usually made immediately to the adjacent track.
In reality, it takes a few milliseconds to reliably read from the next track.
In addition, a few milliseconds are read from the old track.
It's hard to figure out exactly what the program does but it expects a certain position on the following track
or expects to read data on the current track after the command to change tracks has already been given.
Activating the stepper delay emuulation just before loading the problematic part is not enough to fix the problem.
It needs to be enabled from beginning, so no I can't specify the exact moment.
By the way, it can also be fixed if the track alignment is offset by about 10 ms when reading in the D64 and no stepper delay is emulated overall. |
User Comment
Submitted by Jammer on 12 June 2022
| @PiCiJi: Can you specify which exact moment crashes on real C64 with real drive? |
User Comment
Submitted by KAL_123 on 11 June 2022
| @PiCiJi, interesting infos. I knew, there were a problem here. Then this partly also exists on real drives with this demo, but not quite as bad. Will try this thing out, with these recommended settings for the emulator. I like this demo, a repaired version, that not crashes at all, would be great. |
User Comment
Submitted by PiCiJi on 11 June 2022
The image works on a real drive, at least most of the time. In 10 attempts, the demo crashed 4 times.
The stepper motor delay must be emulated. In Denise set "Stepper Seek Time" to at least 9 ms.
Like on the real drive, it won't always work. This is due to drive fluctuations.
Either you use a save state just before this area is loaded for safety or set the option "Disk Wobble" to zero. |
User Comment
Submitted by KAL_123 on 31 May 2022
I guess, this diskimage really must have a bug. Tried this demo with the current versions of Denise, VICE and HOXS today and it don't run to the end. All emulators stop exactly at the some point. First i thought, maybe this is the end of this demo, but then i watched two youtube-videos of this demo and there it runs completely through. So the problem must be this uploaded diskimage here, because it would be an extreme coincidence, if all three emulators had the same incompatibility. When you compare it with this video here
https://www.youtube.com/watch?v=l-kycpzO1TU
then this uploaded disk-image here, always stops, when the picture is shown, that comes in minute 8:02 of the video. The remainig 3 minutes can not be watched with this diskimage here. Has anybody tried this image on a 1541-Ultimate or a real 1541? |
User Comment
Submitted by Peacemaker on 20 May 2016
| hmmm. crashes on vice 2.4.27 rev 31139M at a lowres pic some minutes after start. |
User Comment
Submitted by Cruzer on 20 May 2016
| Definitely some of the smoothest effects ever, especially the interference and twister. Not even kidding. |
User Comment
Submitted by psych on 20 June 2009
User Comment
Submitted by celticdesign on 13 May 2009
User Comment
Submitted by jailbird on 30 October 2004
| A smooth, fine demo. Nicely combined code, music and graphics... |
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