Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!cs.utexas.edu!uunet!mcvax!unido!tub!tubopal!alderaan From: alderaan@tubopal.UUCP (Thomas Cervera) Newsgroups: comp.sys.atari.st Subject: Re: Multitasking on the ST Message-ID: <652@opal.tubopal.UUCP> Date: 4 Aug 89 22:51:15 GMT References: <8908021826.AA05333@ucbvax.Berkeley.EDU> <15627@watdragon.waterloo.edu> Reply-To: alderaan@tubopal.UUCP (Thomas Cervera) Organization: Technical University of Berlin, Germany Lines: 14 What's all this about MultiTasking on the ST ? You don't have a MMU (not really and I think that's the worst failure in the ST's hardware architechture), so you are definetely not able to run a *secure* multitasking on this machine even if you want to - basta. All what you can call protected memory inside the ST is a bunch of bytes at the bottom plus the hardware registers - that's it. If you want to realize reasonable memory segmentation (in my experience this is essential for TimeSharing) you MUST have a MMU. -- Thomas Cervera | UUCP: alderaan@tubopal.UUCP SysMan RKOpdp (RSTS/E) | alderaan%tubopal.UUCP@TUB.BITNET (saves $$$) D-1000 Berlin 30 | ...!pyramid!unido!tub!opal!alderaan Motzstrasze 14 | BITNET: alderaan%tub@DB0TUI11.BITNET