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- #Powerpc emulator mac os high sierra how to
- #Powerpc emulator mac os high sierra for mac os x
- #Powerpc emulator mac os high sierra update
- #Powerpc emulator mac os high sierra code
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Starting with the Public Beta and up through 11.6, there have been 154 macOS releases, both major and minor.Some random notes, updated from the original post: This has happened a few times over the years.
#Powerpc emulator mac os high sierra update
This is to keep the version numbers in the proper order, even when an older OS received an update after a major new release came out. Some entries may appear out of chronological order (i.e. Note: The Days column reflects the number of days between releases. Ⓘ Leopard - First universal binary release Ⓘ Snow Leopard - First Intel-only release Ⓘ Lion - App Store only (USB stick later) But I’m pretty sure that it’s impractical - given that Apple ended using a VM for Classic on PPC, I suspect that they determined that a translation approach wasn’t going to work.Fixes a launch issue for certain 32-bit apps * This release is not included anywhere on Apple's site. To be clear, I love the hell out of the idea of a Classic-to-OS-X API translator. (Another approach I considered here was to just make the emulated core run as little-endian, but some programs are, unfortunately, sensitive to this change.) There’s no easy way to get around this besides maybe byte-swapping everything on the way in and out of native functions, and that seems hugely error-prone.
#Powerpc emulator mac os high sierra code
System structures (like a Rect, for instance) allocated by emulated code will be big-endian, but the OS will want them little-endian. You can provide your own implementations of all the most obvious ones, like _NewPointer, but internal allocations by other functions (like, say, _NewWindow with nil wStorage) are largely out of your control. While you can point native APIs at emulated structures, you can’t force them to make all their own allocations within that arena. So, I’ve considered this issue myself for a very similar (unpublished) project, and trying to use this 64-bit approach (or, indeed any sort of big-endian memory space on x86!) rapidly runs into a few nasty issues. It would also need to be wired up to use something like vm_allocate with a hint address, to ensure you get allocations in the exact range you need. Your custom zone would need a malloc implementation, but you can pick from any number of open-source ones (e.g. One approach would be to create a custom malloc zone, and then use malloc_zone_* versions of the usual malloc functions when allocating any memory that needs to be visible to your PPC code. I’m not aware of a built-in way to do this, but it is doable with a bit of work.
#Powerpc emulator mac os high sierra how to
So, what should I do? Is there a built-in mechanism that will let me try to allocate memory, malloc-style, inside a specific address range? Otherwise, is there a good, readable, open-source implementation of malloc I could base myself on? How to solve this problem? Solution no. There are two solutions I am thinking of right now: Since a 64-bits address space has enough room to host four billions independent 32-bits address spaces, this sounds like a good way to go for me.īut I still have a problem: I need to be sure that I’ll be able to allocate memory inside that address range, because it would be impossible for the PPC interpreter to access anything outside of it. (Having a map that translates PowerPC addresses to native addresses is out of question, for performance and design reasons.) I’ve designed the “platform” with an eventual switch to 64-bits in mind: the interpreter expects a base address and all PowerPC pointers are offset by that base address. Not to mention that it’s not super-safe to let the PowerPC code access everything the host process can. However, as I’m trying to build around that core, it’s becoming more and more constraining (for instance, you can’t use ARC with 32-bits Cocoa applications). To satisfy that constraint, currently I’m compiling for i386 only. My biggest issue so far is that PowerPC programs are 32-bits, so pointers need to be 32-bits. The whole thing is kind of working: there are some bugs in the interpreter, but that was expected and I’m working on that. To achieve that goal, I implemented a PEF executable loader, a PowerPC interpreter that can bridge to native code, and some Mac OS 9 libraries.
#Powerpc emulator mac os high sierra for mac os x
I am writing a Mac OS 9 “compatibility layer” for Mac OS X because I was struck with nostalgia recently, and because all current solutions require you to run Classic inside a virtual machine that doesn’t support everything it should to run the stuff I want to use.