erd@duke.cs.duke.edu (Ed Darken) (05/23/91)
I just received four 4Mb SIMMs for my Mac IIci and slapped them into the machine. Now I have 20 mb (16 in Bank A and 4 in Bank B). The Mac seems to run fine, but the system thinks it occupies the lower 12 mb of memory. Can somebody tell me what's going on? I thought the IIci could handle 4mb SIMMs. What have I missed? Thanks, Ed Darken erd@cs.duke.edu
erd@duke.cs.duke.edu (Ed Darken) (05/24/91)
Duh. Yeah, I remember now. System 6.whatever can't use more than 8 megabytes because of 24-bit addressing (24 bits allows 16 Mb of address space, about half of which is reserved for ROM and, I guess, I/O, leaving 8 Mb for RAM). Thanks to all of you who enlightened me. I guess it's on to System 7.0 for me!