Path: utzoo!utgpu!watmath!clyde!att!pacbell!ames!amdahl!pyramid!prls!philabs!linus!mbunix!jcmorris From: jcmorris@mitre-bedford.ARPA (Joseph C. Morris) Newsgroups: comp.sys.ibm.pc Subject: Re: Expanded vs. Extended mnemonic. Summary: Another mnemonic for expanded/extended memory Message-ID: <42393@linus.UUCP> Date: 3 Dec 88 00:34:47 GMT References: <36835@clyde.ATT.COM> Sender: news@linus.UUCP Reply-To: jcmorris@mbunix (Morris) Organization: The MITRE Corporation, McLean, VA. Lines: 19 In article <36835@clyde.ATT.COM> rjs@moss.ATT.COM writes: > >A simple mnemonic was provided by someone on the net a few months ago >to help remember the difference between expanded and extended memory. > > [extended=long/thin, expanded=short/fat mnemonic discussion] Another one I've seen on the net which helps me is: exTended: what you get with an AT. Memory is available as normal, DOS- managed address space. Available only on '286 and higher systems; no 8088's need apply. exPanded: what you get with a Paged interface like LIM, under which you have a small (like 64K) page window with support software which responds to special calls to remap the window address space to an area within the LIM memory (which is not otherwise addressable by the 8088-type CPU). Works fine with old 8088 chips since there is no need to address physical memory beyond the 20-bit address bus.