meckert@eniac.seas.upenn.edu (Michael Eckert) (05/21/91)
Since accessing large amounts of memory seems to be so important (see the Dirty (Non 32-bit Clean) ROM issue), I have a question. I have a MAC IIsi which has only four SIMM slots, which means that at present I can have a maximum of 17 MB (4 x 4MB SIMMS + 1MB) on the computer. Will I be able to pop in 16 MB SIMMS when they become available? Or are there hardware limitations on memory access? This is an important question for a budding power user of the future. Michael meckert@eniac.seas.upenn.edu
hades@eleazar.dartmouth.edu (Hades) (05/21/91)
meckert@eniac.seas.upenn.edu (Michael Eckert) writes: >Since accessing large amounts of memory seems to be >so important (see the Dirty (Non 32-bit Clean) ROM >issue), I have a question. I have a MAC IIsi which has >only four SIMM slots, which means that at present >I can have a maximum of 17 MB (4 x 4MB SIMMS + 1MB) >on the computer. Will I be able to pop in >16 MB SIMMS when they become available? Or are there >hardware limitations on memory access? This is an important >question for a budding power user of the future. If you are running Sys 7.0 in 32-bit address mode, a 68030 can access up to 128 Mbytes of Total RAM (Physical and Virtual in any combination, although it is not recommended that you use more than Virtual = 2*Physical or something like that). Therefore 16 MB SIMMS should work just fine in a IISi under these conditions. -- -Hades Hustler Emeritus, Alpha Theta Co-ed Fraternity hades@Eleazar.Dartmouth.Edu -You know the economy's going to hell when drug dealers buy fuel efficient cars
dinapoli@rodan.acs.syr.edu (Ron DiNapoli) (05/22/91)
In article <43546@netnews.upenn.edu> meckert@eniac.seas.upenn.edu (Michael Eckert) writes: > >Since accessing large amounts of memory seems to be >so important (see the Dirty (Non 32-bit Clean) ROM >issue), I have a question. I have a MAC IIsi which has >only four SIMM slots, which means that at present >I can have a maximum of 17 MB (4 x 4MB SIMMS + 1MB) >on the computer. Will I be able to pop in >16 MB SIMMS when they become available? Or are there >hardware limitations on memory access? This is an important >question for a budding power user of the future. > >Michael > >meckert@eniac.seas.upenn.edu From Apple's "Macintosh IIsi Developer Note" (10/5/90), page 16, the text reads: "The Bank B expansion memory can contain either four 256KB SIMMS (made from 1-MBit fast page mode parts), four 1 MB SIMMs, four 4 MB SIMMs, or four 16 MB SIMMs." Ron D.