Path: utzoo!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!sjsca4!molehill!poffen From: poffen@molehill (Russ Poffenberger) Newsgroups: comp.sys.ibm.pc Subject: Re: can I put four floppies in an AT clone Keywords: everex ram memory extended expanded Message-ID: <1990Jan6.221400.5745@sj.ate.slb.com> Date: 6 Jan 90 22:14:00 GMT References: <10767@ucsd.Edu> <4597@hydra.gatech.EDU> <88@slvblc.UUCP> <1990Jan5.171736.15733@druid.uucp> Reply-To: poffen@sj.ate.slb.com (Russ Poffenberger) Organization: Schlumberger ATE, San Jose, CA Lines: 35 In article <1990Jan5.171736.15733@druid.uucp> darcy@druid.UUCP (D'Arcy J.M. Cain) writes: >In article <88@slvblc.UUCP> dick@slvblc.UUCP (Dick Flanagan) writes: >> >>I have two of the Everex RAM-3000 boards. They are EXTended memory boards, >>*not* EXPanded memory boards. LIM in any form is not supported on the board. > >This is almost true. Although expanded memory was originally designed as >a hardware bank switching scheme, the LIM spec allows any sort of memory >to be used as expanded. There are many programs that allow any type of >extended memory to be used as expanded and I believe that Everex includes >one with the RAM-3000. This is the LIM support referred to. Unfortunately you are both wrong. The Everex RAM-3000 DOES support LIM 3.2 in hardware. It now includes a driver to support LIM 4.0 in software through a driver. >As a side note I once used a program which turned a disk file into LIM >expanded memory. It was very slow of course but it was useful for developing >a program which was destined to use EMS without having to stuff the extra >memory in my development machine. Other than speed it worked perfectly. >I think it was called Above Disc. Be careful with these packages, even one that emulates LIM in extended are VERY slow, we are talking at least an order of magnitude slower than *true* hardware LIM. Also, if you are only using a package like turbo 'C' that can use 64K of expanded memory (I wish they could use more), the driver to emulate LIM in extended memory or disk requires ~64K of conventional memory for it's mapping tables. So if you only need 64K or less EMS, it is a loser. Russ Poffenberger DOMAIN: poffen@sj.ate.slb.com Schlumberger Technologies UUCP: {uunet,decwrl,amdahl}!sjsca4!poffen 1601 Technology Drive CIS: 72401,276 San Jose, Ca. 95110 (408)437-5254