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Quackshot!
Posted: Fri Jan 08, 2021 4:56 pm
by hiddenbyleaves
Can someone confirm that Quackshot works?
I've tried the rom from the everdrive packs and from emuparadise and get a black screen on both.
Re: Quackshot!
Posted: Fri Jan 08, 2021 5:24 pm
by Gryzor
Yes, Quackshot works flawlessly here.
Seems you’re not using the proper ROM file.
Re: Quackshot!
Posted: Fri Jan 08, 2021 8:42 pm
by darklpopman
Revision A only shows a black screen. The one in the everdrive pack (Revisions/USA) works.
Re: Quackshot!
Posted: Tue Jan 26, 2021 10:39 pm
by meauxdal
Re: Quackshot!
Posted: Wed Jan 27, 2021 3:34 pm
by meauxdal
I am creating an issue for this on the core GitHub. I've never done this before so it's very possible I'll screw it up somehow, but I figure it will at least get seen that way.
Re: Quackshot!
Posted: Wed Jan 27, 2021 4:18 pm
by aberu
Said this on github too, but saying it here...
https://github.com/ekeeke/Genesis-Plus- ... art.c#L378
This specific rom has it's own exception in emulators for it to work, it's memory mapping isn't standard.
Code: Select all
/* support for Quackshot REV 01 (real) dump */
if (strstr(rominfo.product,"00004054-01") && (cart.romsize == 0x80000))
{
/* $000000-$0fffff: first 256K mirrored (A18 not connected to ROM chip, A19 not decoded) */
for (i=0x00; i<0x10; i++)
{
/* $200000-$3fffff: mirror of $000000-$1fffff (A21 not decoded) */
m68k.memory_map[i].base = m68k.memory_map[i + 0x20].base = cart.rom + ((i & 0x03) << 16);
}
/* $100000-$1fffff: second 256K mirrored (A20 connected to ROM chip A18) */
for (i=0x10; i<0x20; i++)
{
/* $200000-$3fffff: mirror of $000000-$1fffff (A21 not decoded) */
m68k.memory_map[i].base = m68k.memory_map[i + 0x20].base = cart.rom + 0x40000 + ((i & 0x03) << 16);
}
}