the 68000 doesnt have a MMU, and works (without VM) up to OS 7.5.5 On Wed, Nov 25, 2009 at 11:27 AM, Scott Holder <[email protected]> wrote:
> > Jeff Walther wrote: > > > > I'm surprised it would run at all. I had always assumed that with the > > MMU stripped out the Macintosh would be missing an essential > > component. I'm surprised the operating system can handle the lack of > > an MMU. It would be interesting to see what happens if Britt tries to > > turn Virtual Memory on. > > > > Jeff Walther > > For a long time, the 68k Mac emulators like Basilisk II didn't emulate > the MMU. I don't know if they still don't, I haven't messed with it in > awhile (Plenty of real Macs to mess with now ;) ). But, they pretty > much worked fine. > > The net result was the Virtual Memory was completely non-functional; if > you turned it on, it'd just show off the next time you booted. Also, > alternative OSes such as Linux and BSDs that depend on MMUs for core > functions wouldn't work. Apparently, the Mac OS itself (at least through > the 8.1 that 68ks support) doesn't need or care about the MMU aside from > VM. I don't recall now whether some of the specialized apps like > Photoshop that did its own VM and caching worked, but I think they did. > > Scott > > > > > --~--~---------~--~----~------------~-------~--~----~ ----- 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/ -~----------~----~----~----~------~----~------~--~---
