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Graham
Account closed
Registered: Dec 2002
Posts: 990 |
Release id #5937 : Megademo 1
Another demo which simply doesn't work. I assume that the image is ok but the loader simply fucks up everywhere, does anyone know a setup where it is working on? I tried emulator + all drive settings, C128DCR and C64C + 1541-II.
(Another example of a demo which nobody knows because it works nowhere...) |
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Copyfault
Registered: Dec 2001
Posts: 478 |
Accidently I checked this demo some days ago... setting was also a C64C + 1541 II. At least the parts on the first side seemed to be ok; after diskswapping the loader gave up... Now if my brain wasn't so lousy, I could tell if it worked allright back in the 90's... but I don't think so!
CF |
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Graham
Account closed
Registered: Dec 2002
Posts: 990 |
For me it didn't even boot the intro. The loader passes some very complicated routines which reminded me of a copy protection and then simply gave up reading track 17. I suspect that the loader has a hardcoded sector header ID.
BAH! Another coder who shouldn't have started drive coding at all. |
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Copyfault
Registered: Dec 2001
Posts: 478 |
I'm really not sure if this demo worked back then... I assumed that the second side of my copy is just crap. I got the disk somewhen in the nineties...
Can I be of any help with an image of the 1st side of the copy I have here? Guess not, though...
CF |
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Copyfault
Registered: Dec 2001
Posts: 478 |
I'm not in drivecoding at all, so I've got to ask: what does "hardcoded sector id" mean? Is it possible to copy it? A usual D64-image does not seem to carry this information...
Checked the demo again: semmingly the 2nd side has exactly the same problem Vice has when booting the demo. Is it necessary to recode the loader (which nobody will do anyway;)) in order to make this demo d64-image-compatible?
At least the makers of this demo gave out a (hidden) warning in the notefile, where they say the loader is made up of different routines, including some from EPYX...
CF |
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A3
Registered: Dec 2005
Posts: 362 |
Found this demo in 3 different collections all supposedly the 100% version. Non of them are working though in emulation mode. Thinking back, I'm now quite convinced that the demo never worked for me at all even on the c64. |
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tlr
Registered: Sep 2003
Posts: 1790 |
Quoting copyfaultI'm not in drivecoding at all, so I've got to ask: what does "hardcoded sector id" mean? Is it possible to copy it? A usual D64-image does not seem to carry this information...
Checked the demo again: semmingly the 2nd side has exactly the same problem Vice has when booting the demo. Is it necessary to recode the loader (which nobody will do anyway;)) in order to make this demo d64-image-compatible?
The G64-format can contain this (supported by CCS64 & VICE atleast).
http://www.unusedino.de/ec64/technical/formats/g64.html
BTW, Shouldn't a 1541 emulation of a d64 just set the sector-id to the id present in the BAM?
In that case, I don't see why it should not work unless someone has later changed the BAM id of the disk.
The coder of the demo would be quite naive to assume that you'd use a nibbler to copy his demo. ;)
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hollowman
Registered: Dec 2001
Posts: 474 |
The version that I first found on the net back in 97 (or something) never worked, and i've felt ashamed ever since, because i uploaded it to antidote without checking it first.
Some time ago Iopop gave me what i believe is a fully working version, which I've uploaded to csdb now.
Perhaps Iopop can tell about all the hassle it was to get a working version transferred to pc =) |
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The Phantom
Registered: Jan 2004
Posts: 360 |
Hmmm. THe only problems i've had viewing this demo is the ridiculous loading (like there are 2 load phases between each part).
When the intro "looks" finished, hit yer space bar.
On the next (ahem) part, there were no visuals for me, just music. So I hit space and it loaded the next part.
I'm currently on side 2, looking at some "rescue the fractals" part now.
Am I looking at the working version here?
I'm using Vice 1.19, true drive emulation on and PAL for my video. No cart attached and no other "special" features. Seems to be working fine for me. |
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Graham
Account closed
Registered: Dec 2002
Posts: 990 |
Quote:BTW, Shouldn't a 1541 emulation of a d64 just set the sector-id to the id present in the BAM?
In that case, I don't see why it should not work unless someone has later changed the BAM id of the disk.
Well, often a demo has it's directory styled after the demo is finished, that also includes changing the disk header + ID. Also, some cartridges have a hardcoded sector header ID in their fast-format routines and don't care for the ID in the directory.
Quote:The coder of the demo would be quite naive to assume that you'd use a nibbler to copy his demo. ;)
Many loaders have such a hardcoded ID, but in many cases it's enough to assume sector header ID = disk ID. An example is "Follow the Sign 3" by Byterapers.
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Graham
Account closed
Registered: Dec 2002
Posts: 990 |
Oh and concerning the sector header ID problem: What do you guys think about a small extension to the D64 format? Adding 2 bytes to a D64 would allow it to have all possible D64 incarnations with or without sector header ID information and still have a 100% detection what kind of D64 it actually is. |
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