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Krill
Registered: Apr 2002
Posts: 2858 |
Release id #229327 : JustinBlue
Wondering about this demo coming on G64 images.
Upon a quick and nowhere near thorough inspection, the demo uses DreamLoad, 35 tracks, standard Commodore GCR and plain 254-payload-bytes-with-T/S-link file format.
So there doesn't seem to be any kind of speed or storage capacity enhancing format involved.
Why not D64? :) |
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iAN CooG
Registered: May 2002
Posts: 3142 |
The random dir layout seems not working on d64 but on g64, in other words, only an emulation problem.
Other than that, there is really no other reason.
The d64 images were added and then removed because the graffity guys got their pants twisted when the d64s got added to the entry. |
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Krill
Registered: Apr 2002
Posts: 2858 |
Quoting iAN CooGThe random dir layout seems not working on d64 but on g64, in other words, only an emulation problem. Sounds more like a questionable implementation on the demo side to me, relying on a specific sector layout or skew or similar, and breaking randomly when using a different drive, Action Replay or copying from one real disk to another.
Nothing i'd blame on emulation. =) |
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chatGPZ
Registered: Dec 2001
Posts: 11157 |
Quote:only an emulation problem.
That seems unlikely - nothing the regular DOS does requires a G64 |
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Krill
Registered: Apr 2002
Posts: 2858 |
See also: Release id #210333 : Babes |
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Krill
Registered: Apr 2002
Posts: 2858 |
Quoting iAN CooGThe random dir layout seems not working on d64 but on g64, in other words, only an emulation problem. Okay, so they have multiple blocks on track 18 that identify as sector 0 or sector 1, such that loading the dir will be randomised.
This works fine in emulation.
It doesn't map to D64, of course, and wouldn't survive regular disk backup. |
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chatGPZ
Registered: Dec 2001
Posts: 11157 |
https://pastebin.com/Q8K3rqs3
Yep, indeed :) The "doesn't survive regular disk backup" bit bothers me a bit however - the disk would circulate as "broken" versions in no time, noone would bother doing nibble backups of that demo (as it keeps working fine).
If the demo would rewrite the dir track when it starts... then it could magically fix itself :) |
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Krill
Registered: Apr 2002
Posts: 2858 |
Quoting chatGPZIf the demo would rewrite the dir track when it starts... then it could magically fix itself :) Had the same thought. But then it occured to me that people back then would probably have given up already at the backup program choking on errors when reading (missing blocks). =)
So the demo would have needed to come with its own copy program. |
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chatGPZ
Registered: Dec 2001
Posts: 11157 |
Not sure... what would eg copying with AR result in? wouldnt it just write out a complete (working) track 18? |
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Krill
Registered: Apr 2002
Posts: 2858 |
Quoting chatGPZNot sure... what would eg copying with AR result in? wouldnt it just write out a complete (working) track 18? Seems to work.
Copy program took a little longer to read in track 18, but didn't complain.
Copy has a fixed non-random directory, of course. |
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Clarence
Registered: Mar 2004
Posts: 119 |
Cheesion tried hard not go the .g64 way, but iirc with .d64 the demo would not boot on a vanilla c64 (with a fastload cartridge it would, but then it's not a traditional c64 demo anymore).
Side 2 was created as a .g64 only for 1541u users' sake, so the "long press to auto-attach next disk method" works (if side 1 is .g64 and side 2 is .d64 it wouldn't work).
"graffity guys got their pants twisted when the d64s got added to the entry"
If someone comes up with a .d64 that works identical to the .g64 version, it is welcomed, but this was *not* the case.
What people must understand, the randomized directory is the first effect of the demo (a serious 'drive fx' never done before, read the technical note if interested). Wheter people like it or not, it's the official version. If someone disregard it with a simplified .d64 version, and wishes to spread it, then must upload it as a 'crack' in a separate release. |
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