On Fri, 4 Dec 2009 13:20:29 -0800, "Dr. Hawkins" <[email protected]> wrote: > On Fri, Dec 4, 2009 at 12:59 PM, Jeff Walther <[email protected]> wrote: > >> At the time the PPCs were released, all the magazines (IIRC) were >> claiming the emulator was 68020-like, so I didn't look any further >> than the link I posted. It's interesting to see the full story. > > It wouldn't have made a lot of sense to emulate the '020--it didn't > have a math unit unless you added it as a separate chip (nor did it > have a MMU). The '030 and regular '040 had the MMU and FPU built in. > The 68040LC (?) had an MMU, but didn't have an FPU.
All Macs with a 68020 or better CPU had an MMU which allowed them to do virtual memory when System 7 was released. The older 68000 Macs did not have an on-board MMU, so could not do VM. Interestingly enough, while the full 68040 chip had an integral FPU, (while the 68LC040 did not) the emulator in the Power PC Macs did not emulate any FPU functions, so 68k math programs which required an FPU would work on a Quadra 700, but not the Power Mac 8100, for example. On the good side, programs which used Apple's SANE did work on the Power PC architecture with the emulator. -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/
