Xref: utzoo comp.sys.mac.hardware:4225 comp.sys.mac.misc:1042 Path: utzoo!attcan!uunet!snorkelwacker!apple!austing From: austing@Apple.COM (Glenn L. Austin) Newsgroups: comp.sys.mac.hardware,comp.sys.mac.misc Subject: Re: Addressable memory of 68000 (was Re: New Macs) Message-ID: <42651@apple.Apple.COM> Date: 5 Jul 90 07:17:55 GMT References: <90178.172523KPURCELL@LIVERPOOL.AC.UK> <268ACACA.44FD@intercon.com> <316@opusc.CS.SCAROLINA.EDU> <1990Jul4.003731.336@hellgate.utah.edu> <26708@netnews.upenn.edu> Organization: Apple Computer Inc., Cupertino, CA Lines: 20 jeff@eniac.seas.upenn.edu (Jeff White) writes: > On a related note, does anyone know if the 68000 can address more than 4 Megs >of RAM (ie. is the present 4 Meg limit with Pluses and SE's a 68000 limit or >just the way Apple designed those systems)? The problem is that the ROMs on the Plus and SE are located at the 4MB address location. Since the Memory Manager doesn't know how to handle non-contiguous RAM, 4MB is the limit on these machines. -- ----------------------------------------------------------------------------- | Glenn L. Austin | "Turn too soon, run out of room, | | Auto Racing Enthusiast and | Turn too late, much better fate" | | Communications Toolbox Hacker | - Jim Russell Racing School Instructors | | Apple Computer, Inc. | "Drive slower, race faster" - D. Waltrip | | Internet: austing@apple.com |-------------------------------------------| | AppleLink: AUSTIN.GLENN | All opinions stated above are mine -- | | Bellnet: (408) 974-0876 | who else would want them? | -----------------------------------------------------------------------------