Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!samsung!crackers!m2c!risky.ecs.umass.edu!dime!gray From: gray@ibis.cs.umass.edu (Lyle Gray) Newsgroups: comp.sys.apple2 Subject: Re: Apple IIGS's Memory Limit Message-ID: <32395@dime.cs.umass.edu> Date: 21 Jun 91 11:58:17 GMT References: <9106191921.AA23636@apple.com> <43521@cup.portal.com> Sender: news@dime.cs.umass.edu Reply-To: gray@ibis.cs.umass.edu (Lyle Gray) Organization: University of Massachusetts, Amherst Lines: 35 In article <43521@cup.portal.com> -Rich-@cup.portal.com (Richard Sherman Payne) writes: >>On Tue, 18 Jun 1991 20:20:04 GMT Lyle Gray said: >>>>The on-board RAM lies within the 8MB space. >>> >>>I seem to recall (from the original owner's manuals) that the RAM limit was >>>8.25 Mb, not 8 Mb. The remaining addressable space (up to 16 Mb) was reserve >d >>>for ROM expansions. >> >>It's actually 8.388608MB, but that's considered '8MB'. Just like, 1k is reall >y >>1024 bytes and 1MB is really 1 million plus 24kb. > >This is a little mixed up as I understand things. The addressable space >is 2^23= 8,338,608 bytes. Since 1K = 1024 bytes, we have 8,388,608/1024 = >8,192 KB. By common usage, this is called 8MB. Now 8.338608 MB would be >8.338608 * 1024 = 8,589.93 KB, which is about 400K over 2^23 bytes. > >The error seems to be dividing by 1000 to convert from 8,338,608 in >converting from bytes to MB. A common mistake to those not computer >literate. But I am surprised to see it here. > All right, now you've annoyed me. ;-) _I_ did not make that mistake (I'm quite familiar with it, from having to educate people about the real meaning of 1 megabyte). I was merely stating what I recall reading in the original owner's manuals for the IIgs. I can't find my manuals right now (dig, dig), but that _is_ what I remember: slightly more than 8 megs for RAM, slightly _less_ that 8 megs for ROM. It's possible that has changed since, but that's what I remember. -------------------------------------------------------------------------- Lyle H. Gray Internet (personal): gray@cs.umass.edu Quodata Corporation Phone: (203) 728-6777, FAX: (203) 247-0249 --------------------------------------------------------------------------