Article View: comp.sys.ibm.pc.programmer
Article #1565Re: adding to the heap?
From: Steve Resnick
Date: Tue, 13 Mar 1990 19:12
Date: Tue, 13 Mar 1990 19:12
18 lines
1519 bytes
1519 bytes
In article <9898@batcomputer.tn.cornell.edu> braner@tcgould.tn.cornell.edu (Moshe Braner) writes: >and even the first >64K (minus 16 bytes) of extended RAM, which supposedly you can cheat >and read from "real" mode (using the segment FFFFH, offsets over 000FH >- is that really possible?). It is really possible on some machines which have a way to toggle the A20 line on the CPU address bus. Normally this is disabled. The problem with using memory between FFFF:10 and FFFF:FFFF is that other programs may assume this memory is usable, including TSR's and device drivers..Microsoft, Lotus, Intel and AST Research came up with an eXtended Memory Specification (XMS) which MS has drivers free for the asking. Just call 'em up and they will send you a manual and diskette describing the specification and provding a device driver which implements the XMS 2.0 specification (Which is similar in function to EMS) They also include source code for those interested assembler hackers... :) Steve
Technical Details
Message-ID:
<1990Mar13.191242.29304@Octopus.COM>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uwm.edu!lll-winken!elroy.jpl.nasa.gov!usc!samsung!rex!ames!vsi1!octopus!steverReferences:
<9898@batcomputer.tn.cornell.edu>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uwm.edu!lll-winken!elroy.jpl.nasa.gov!usc!samsung!rex!ames!vsi1!octopus!stever From: stever@Octopus.COM (Steve Resnick ) Newsgroups: comp.sys.ibm.pc.programmer Subject: Re: adding to the heap? Message-ID: <1990Mar13.191242.29304@Octopus.COM> Date: 13 Mar 90 19:12:42 GMT References: <9898@batcomputer.tn.cornell.edu> Reply-To: stever@octopus.UUCP (Steve Resnick ) Distribution: usa Organization: Octopus Enterprises, Cupertino CA Lines: 19