Mini vMac v3.2.1 (2010-07-15) is released.Mini-vMac is a Macintosh Plus, Macintosh SE, Macintosh 128 and Macintosh 512 emulator. Mini vMac emulates a Macintosh Plus, one of the earliest of Macintosh computers. It can run old Macintosh software that otherwise couldn't be used on recent machines. Mini vMac v3.2.1 (2010-07-15) Changelog:
| The theme for the latest Development source snapshot is address space translation, the mapping between emulated memory and real memory. With much refinement the new scheme developed at the end of last year (internally known as "UseMATCs"), is within a few percent of the speed of the previous scheme (internally known as "UseBanks"). So I've decided to make the new scheme the default, trading some of the speed gained by recent use of x86 assembly for more accuracy and flexibility. The "UseMATCs" scheme can handle equally well the old 24 bit addressing and the newer 32 bit addressing, available on the Mac II and later. It also allows detecting misalignment without additional speed penalty. This is important because in previous versions of Mini vMac, a misaligned memory access near the very end of a bank of memory could end up reading or writing past the end. This mostly worked for Macintosh Plus emulation, because the memory mapping is mostly contiguous. (For safety, Mini vMac allocates a few extra bytes past the end of emulated memory.) It's just inelegant, and not a practical problem. For later Macintosh computers, it could matter more, particularly if one wanted to emulate a PMMU. Mini vMac can now accurately emulate non contiguous memory mappings. Some unrelated tweaks to the PowerPC assembly version allow it to nearly maintain it's previous speed. In other unrelated work, the Mini vMac build system now supports the Digital Mars Compiler (with "-t wx86 -e dmc") and the Pelles C Compiler (with "-t wx86 -e plc" and "-t wx86 -e plc -cl"). Much of this work was accomplished during a trip from June 23 to 30, with gas sponsored by Anonymous. |
Download: Mini vMac v3.2.1 (2010-07-15)
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