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#1 |
Registered User
Join Date: Jan 2008
Location: denmark
Posts: 268
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Alcatraz Megademo 3
Hi guys I'm going through alot of a500 demos now, since my a1200 just blew its sounds
![]() ![]() ![]() I should say that i run this on ocs chipped amiga500, kick1.2 and with some 512k ram expansion, but i dont think the expansion is causing the problem, coz when i try the exact same dumps on winuae, it does the same noises. Hope someone can help or at least let me know, if this is the only known dump that exist. thx and happy new years all |
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#2 |
Junior Member
Join Date: Aug 2001
Location: France
Posts: 1,385
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i don't know if you check this link : http://ftp.amigascne.org/pub/amiga/G...-Megademo3.dms
Worth to check http://kestra.exotica.org.uk/ but database problem atm. |
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#3 |
Registered User
Join Date: Jan 2008
Location: denmark
Posts: 268
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yea I think I tried that link aswell, anyways, I downloaded from your link, just to be sure and it the same deal
![]() ![]() Oh yea I allso dug out my dusty scene archieves cd's and that dump is even worse, it simply skips the entire part lol, so it seems that the one u linked is the best of them, so I'm keeping that and moving on thx m8 ![]() |
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#4 |
Registered User
Join Date: May 2006
Location: Paris/France
Age: 52
Posts: 527
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hi,
works fine : http://bitworld.bitfellas.org/demo.php?id=3252 I'll add the zik links later today. Cya Sylvain |
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#5 |
Registered User
Join Date: Jan 2008
Location: denmark
Posts: 268
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Sorry for the late reply, needed sleep lol, yea I checked it and works the same as above, but as I said, it's probly the best dump, maybe I have a hardware problem, coz sounds of gnome is the same, both red and blue version (yep one boots in red from amigascne) except the red doesnt slow down like a heavy pc game does your windooze machine and acme's megademo in first part have same weird scratch, seems im the only one with that problem so maybe i need to replace some chips
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#6 |
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,573
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Very late answer but I was just debugging this thing..
There are 2 other problems with this megademo: - 4th part requires OCS Agnus. Note that this is not the standard modulo error (see Eliminator & first Double Dragon 2 release) but I think DDFSTRT/STOP combination enabling "too long" bitplane DMA scanline (DDFSTRT=0x32, OCS sees 0x30, DDFSTOP=0xD4. I think this means final end position will be 0xE2 which is also position of first refresh slot) which probably confuses some Agnus' internal DMA state machines. (this is not emulated) -5th part, "green alien" dualplayfield bitplane priority is inverted. This part only works correctly if demo disk is inserted after Amiga asks for bootable disk. ("insert disk" screen = second copper list initialized -> demo sets wrong BPLCON2, KS copper list fixes it..) |
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#7 |
Moderator
Join Date: Nov 2004
Location: Eksjö / Sweden
Posts: 5,658
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He's running it on A500, not A500+, so OCS Agnus is not a problem
![]() And WinUAE is not used. ![]() So the dump is the problem here? Or what. |
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#8 |
Protracker
Join Date: Sep 2008
Location: 8364
Posts: 381
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I'm gonna go ahead and guess that it's not entirely ks1.2 compatible, but rather needs ks1.3. It wouldn't be the first demo I've run in to that crashes under 1.2, I know for a fact that Phenomena's Megademo crashes about halfway through unless you have 1.3. The link posted by Asle works like a charm here, but the amigascne.org link points to a dms which is ~250 bytes large. Would definately say something is wrong with that dump. (:
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