Well, I know, why it doesn't work, but what I don't understand is, why didn't anyone fix it? All these emulators use drivers as for gfx so for sfx, so why?Download Sheep Squad for Windows or Mac (Emulator) Pixel Squad. The ShapeShifter and SheepShaver projects were originally conceived and programmed. The name is a play on ShapeShifter, 1 a Macintosh II emulator for AmigaOS (made obsolete by Basilisk II), which is in turn not to be confused with a third-party preference pane for Mac OS X with the same name. SheepShaver is an open-sourcePowerPCApple Macintoshemulator originally designed for BeOS and Linux.It's used directly by MacOS to store local variables and it seems that it's not easy to patch the rom to use other location. What is SheepShaver PPC emulator (for Windows + Mac OS X) Setup is easy, just visit the Commodore 64 github page.As you will remember you used a program called prepareemul or rsrvcold/warm to reserve the first kilobytes of memory for the mac emu. This means that both BeOS/Linux and MacOS applications can run at the same time (usually in a window on the BeOS/Linux desktop) and data can be exchanged between them.CoolROM.coms extensive emulators section.The most advanced of these emulator programs is SheepShaver.1.- Write a tool that reserves the memory area from 0x000 to 0x3000 (that may require help from the main MOS developers because no info is available about memory management functions).The main subject of this page is the 680x0 emulator Basilisk II, but there is also much on here that is relevant to SheepShaver, a more recent development.2.- Write a tool that uses the MMU to remap the damn memory area to another location. Versions 6 through 9) can only be run through software that emulates Macintosh hardware from 1980s and 1990s. Under Windows, software written for the 'classic' Mac OS (i.e.
Sheep Shaver Emulator Mac OS X With The![]() That would be enough to have SheepShaver working, and 68k mac emus would be able to use directly memory, boosting perfomance.If we talk about MAC emus that use the cpu directly you will see that ALL of them use MMU, including SheepShaver(unless you have freed the first kilobytes, then it would be optional) and MOL"I guess that if the MMU API is not public there are several good reasons anyway."ALL modern OSes have an API to manage memory, yes you could even do that in a standard way in OS3.x if you used MMU.library, you can do it in windows, beos, qnx, linux, amigaos4, macos, macosx and any OS that is not MSDOS.If there are good reasons I'd like to see a list.I don't think it would be dead slow. If there are functions available and documented then it's not hack.But we are talking about MOS here, we wouldn't need MMU if the first kilobytes were free for Mac emus. Adding JIT or not is a matter of changing the cpu engine, but the memory layout changes anyway and you have to convert addresses"Playing with MMU to emulate on AmigaOS 68k is a hack, and remenber AmigaOS 68k doesn't take care at all of the MMU."If you don't use MMU.library or any standard method then yes, it's a hack. Emulator are slower (I don't think it would be that slower on the same CPU) but more OS/hard independantPS: I'm not a low-level CPU/OS specialist so I may be wrong, but that's only my mind.It would be very slow to emulate the PowerPC on the PowerPC.Regarding the PowerPC having complex instructions that sohuld be hard to emulate on the x86 care to give any examples, I'm not aware of any complex instructions that could be tricky to emulate. I may be wrong of that point.In conclusion, VM are faster but more OS/hardware dependant. So you emulator/VM is still glue to old stuff. For example, MOL needs a kernel module to work, so it can get these.Even if you have some kind of access to 0x0 -> 0x3000, it's only for "old style" mac not for "new World" one. "No, you only have to patch the ROM as in SheepShaver or MOL."Even if you have some kind of access to 0x0 -> 0x3000, it's only for "old style" mac not for "new World" one. Shapeshifter was more agressive with the OS and the MacOS ran in Supervisor mode because it patched exec."So if you emulate the whole CPU, you have all of that, whereas if you "only" get MMU you still miss supervisor. I think that Basilisk2 does the same on Amiga. But I think that adding MMU emulation would half the speed"I was thinking that in order to emulate something like a PowerMac you need all the CPU functions, including supervisor mode, supervisor register, "If I remember correctly SheepShaver and MOL patch the MacOS ROM/Kernel to avoid the need of that so it runs in user mode. (there's some more in extended mode))Yes you need to provide a supervisor environment if you want to emulate a NewWorld architecture MacOS 9 might look old on the surface but there's a fully preemptive kernel in the background that runs the BlueTask (on new world macs) (this works similar to ABox on MorphOS).Low mem variables ain't the largest problem it's the speed issue, you can sure implement the whole system in software but it would be horribly slow.And yes you're correct that the Low Mem is only relevant to Old world style (which don't run MacOS X for that matter.)Old world style is also what sheepshaver emulates although it makes some trickery to reduce overheads in emulation.Having access to the MMU allows you to push time expensive task onto the hardware it can be the difference between a usable and an unusable emulator."By the way, the PowerPC has some complex instruction that should be hard to emulate on a x86 for example."SheepShaver already emulates a non-MMU 604. Check out QEmu for example. If you use a very optimized JIT engine you could make it run at a fraction of the real speed. Emulator are slower (I don't think it would be that slower on the same CPU) but more OS/hard independant"Uh? emulating a CPU with the same CPU is SLOW. But MOL requires advanced memory management functions not available in MOS."In conclusion, VM are faster but more OS/hardware dependant. I may be wrong of that point."I'm not sure about that, SheepShaver is designed to allow the use of "new world" roms but it's not clearly documented or visible in the sourcecode if it's obligatory to have reserved the first kilobytes of memory with "new world" roms.It would be a matter of checking MOL sources (too many files for my taste, I find it confusing). All of them will run slow.From "SheepShaver: 2.2-20040224 clockwiseGwenole Beauchesne took to the news groups to promote SheepShaver today.Additionally, he posted the following to the mailing list:".emaining bits prior to a formal release would include runtime depth switching from B2 and fixes for DGA displays + other ports. Megadrive, Atari, UAE with P96, anything you want. An emu like Sheepshaver/MOL is the fastest way to do this, not an emu that tries to emulate everything.If emulating a CPU with the same CPU is enough fast show me an emu for my classic Amiga that can run at decent speeds. If MMU emulation is added it will be at least twice slow, so you are stuck with an emu eight times slower than the real thing.And what we want is to run the OS, not to emulate the machine, and to run the apps at the fastest speed. Where to place mod folder for minecraft on macIt runs but some features may be missingI hope they integrate it more with the Basilisk2 sources and that they add support for MacOS 9. That should make it more user-friendly to build & get something working with MacOS 8.6 out-of-the box.Sources (CVS snapshots) + precompiled binaries as RPM: Files: SheepShaver-2.2-20040224.tar.bz2, SheepShaver-2.2-10.*.rpmImproved generic JIT, also now translates FPU instructionsAltiVec emulation, thus enabling the PVR to match a 7400 (G4)Partial port to Darwin/PPC, i.e.
0 Comments
Leave a Reply. |
AuthorMonica ArchivesCategories |