Path: utzoo!attcan!uunet!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!pikes!boulder!stan!marvin!imp From: imp@marvin.Solbourne.COM (Warner Losh) Newsgroups: comp.sys.dec.micro Subject: Re: Rainbow EchoMail Digest Message-ID: <1990Oct29.073122.27959@Solbourne.COM> Date: 29 Oct 90 07:31:22 GMT References: <9010282330.AA27752@remote.dccs.upenn.edu> Sender: news@Solbourne.COM Organization: Solbourne Computers Inc. Lines: 41 >Rainbow EchoMail Digest Oct 28, 1990 >From: DAVID MAROUN > >Unaided MS-DOS recognizes 655 000 characters of that. This is a white lie. MS-DOS on a IBM-PC only recognizes 640K of memory, but MS-DOS on the Rainbow will recognize up to 896K. The rest of the memory on clones is reserved for hardware access to cards. >From: GEORGE THEALL > >DM>Now the question is: Will utilities that allow use of extended memory >DM>on other machines work on Rainbows? > > David, please note that "extended" memory in the area of PC >compatibles has a rather specific meaning - memory whose addresses lie >above 1024KB (ie, 1MB) - and as such requires a 286 or better. As I >don't believe the memory board from SS requires a 286, I doubt it >contains so-called extended memory. No, it doesn't contain extended memory. No, it doesn't need a 286 to work. The card from SS (RAMbow?) Uses 1Meg chips and just throws away the extra (as near as I can tell). I seem to recall[%] that expanded memory uses interrupts to map different parts of the extra memory into a "page" that was part of the 1Meg address space of the 8088. As such, I've seen a program that were supposed to allow you to setup a virtual area of memory that really lived on disk. I've never tried to run this on my Rainbow, so I don't know if the program will work. This program was posted to comp.binaries.ibm.pc a while back. Warner --- % From reading a book from The Waite Group, so I don't know how reliable the information is. I never do quite trust the information in Waite Group books. Their C++ book had so many obvious bugs in their examples that I stopped reading it after a couple of chapters. -- Warner Losh imp@Solbourne.COM How does someone declare moral bankruptcy?