Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!qt.cs.utexas.edu!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!ucbvax!gnh-starport.cts.com!whitewolf From: whitewolf@gnh-starport.cts.com (Tae Song) Newsgroups: comp.sys.apple2 Subject: Re: Apple IIGS's Memory Limit Message-ID: Date: 29 Jun 91 07:16:32 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 34 |Re: Theoretical memory limit on the GS - 8 MB? 16 MB? 17.125 MB? | |I'm shocked. In all of this thread I've seen, everyone has mentioned only |what is directly accessible. Has everyone forgotten the 128K 8-bits? The |address space on a 6502/65C02 is only 64K - surely someone could figure out |a way to do something similar with the GS, no? |Re: Theoretical memory limit on the GS - 8 MB? 16 MB? 17.125 MB? | |I'm shocked. In all of this thread I've seen, everyone has mentioned only |what is directly accessible. Has everyone forgotten the 128K 8-bits? The |address space on a 6502/65C02 is only 64K - surely someone could figure out |a way to do something similar with the GS, no? We're talking about two different types of memory addressing here. The max amount of memory the 65816 can address DIRECTLY is 16MB. The max amount of memory the GS can address is 8.25M of RAM and 1MB of ROM (this includes ROM already built in) on the ROM 2 (01) GS. On the ROM 3 GS you can address 8.125MB and 1MB of ROM. (I'm sure someone will correct me if I'm wrong). All the stuff above deals with memory being addressed DIRECTLY. The other is bank-switching and I and have no idea how or why you'd want to. And one other type is virtual memory which hasn't been perfected for the GS. Question sticks out in my mind, though... if you have a ROM 3 GS and add 8M to it, you'd have 9.125MB... what would happen to the the top 1M? would it be available as a RAMdisk or would it end up been wasted... ??? INET: whitewolf@gnh-starport.cts.com UUCP: crash!gnh-starport!whitewolf ARPA: crash!gnh-starport!whitewolf@nosc.mil