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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- The DOS Protected-Mode Assembler ASEMX --><HTML><HEAD><TITLE>The DOS Protected-Mode Assembler ASEMX</TITLE></HEAD><BODY BACKGROUND="spiral.gif" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#990099" ALINK="#FF0000"><TABLE WIDTH="98%"><TR><TD WIDTH=60 VALIGN=BOTTOM NOWRAP><IMG SRC="transp.gif" ALT="" WIDTH=60 HEIGHT=20></TD><TD><!-- Ab hier Seitentext: --><BIG><BR><P><STRONG><U>II.1.8 The DOS Protected-Mode Assembler ASEMX</U></STRONG></P><P>In general, the proven real-mode assembler ASEM.EXE is sufficient alsofor very large programs. Nevertheless, it may be running out of memory,if a program contains a huge number of long user-defined symbols, or lotsof large macro definitions.<BR>To close the gap, the <NOBR>ASEM-51</NOBR> package includes the new protected-modeassembler ASEMX.EXE. ASEMX is functionally identical to ASEM, but it canuse extended memory, to meet extreme workspace requirements.<BR>ASEMX is accompanied by Borland's 16-bit DPMI server DPMI16BI.OVL andruntime manager RTM.EXE. It requires a 286 CPU (or better), and at least512 kB of free XMS memory (1 MB recommended)!<BR>When ASEMX is invoked, DPMI16BI.OVL and RTM.EXE must be either</P><P><UL><LI>in your default directory,</LI><LI>where ASEMX.EXE is, or</LI><LI>somewhere in your PATH</LI></UL></P><P>During startup, the DPMI server tries to allocate all the remaining freeXMS memory for use by ASEMX. If you don't want this, you can restrict theamount of allocated memory with the DOS environment variable DPMIMEM:<BLOCKQUOTE><STRONG><PRE>SET DPMIMEM=MAXMEM n</PRE></STRONG></BLOCKQUOTE>will restrict the XMS memory space, used for the DPMI interface, to n kB.<BR>Never set n to a value greater than 16383!!!</P><P>In general, the Borland DPMI interface is very reliable and does normallynot conflict with other memory managers. ASEMX will also run with otherversions of DPMI16BI.OVL and RTM.EXE provided with various Borland softwarepackages (except <NOBR>TC++ 3.0</NOBR> and <NOBR>BC++ 3.1</NOBR>).</P><P>However, there is trouble ahead on systems with more than 16 MB RAM!Without specific installation, there is a fatal tendency to crash, hang,or even boot, whenever a DPMI program like ASEMX is invoked.<BR>For proper operation of the DPMI interface, <NOBR>MS-DOS 5.0</NOBR>(or later) is required, and EMM386.EXE must be loaded!<BR>If EMM386.EXE has been loaded with parameters (e.g. NOEMS), the Borland16-bit DPMI server cannot handle more than 16 MB! However, withoutparameters (i=nnnn, x=nnnn are o.k.) or with other DPMI servers there maybe more. In these cases, ASEMX can use up to 64 MB of extended memory!</P><P>If ASEMX is running in a system environment with an own DPMI server, e.g.the Windows <NOBR>DOS-Box</NOBR>, RTM.EXE will detect this and use the active DPMIserver instead of DPMI16BI.OVL. In this case, the environment variable DPMIMEM hasno effect.<BR>To restrict (or increase) the available XMS memory for the <NOBR>Windows 3.1x</NOBR>DOS prompt, change file DOSPRMPT.PIF in your WINDOWS directory with the WindowsPIF file editor.<BR>For further information on how to make more or less XMS memory availableto application programs in other system environments, see the correspondinguser manuals.</P><P>Another interesting alternative is the Borland 32-bit DPMI server withvirtual memory management. It cannot be provided with the <NOBR>ASEM-51</NOBR> packagefor license reasons, but is contained in Borland's Turbo-<NOBR>Assembler 4.0</NOBR>and 5.0, <NOBR>Borland C++ 4.5x</NOBR> and 5.0x, and maybe others. It has originally beendeveloped for the Borland command line tools, but it also works with ASEMX.It requires a 386 CPU (or better), and allows to extend the free physicalmemory with a swap file that can be created with the program MAKESWAP.EXE.Apart of that, the 32-bit DPMI server DPMI32VM.OVL and the runtime manager32RTM.EXE are required.<BR>The batch file ASEM32.BAT, provided with the <NOBR>ASEM-51</NOBR> package, shows how torun ASEMX with 64 MB of virtual memory, using Borland's 32-bit DPMI server.</P></BIG><!-- Seitentext Ende --><P><BR><BR><CENTER><TABLE WIDTH="70%"><TR><TH><A HREF="contents.htm"><IMG SRC="home.gif" ALT="[contents]" BORDER=0 WIDTH=32 HEIGHT=32></A></TH> <TH><A HREF="doswin.htm"><IMG SRC="up.gif" ALT="[up]" BORDER=0 WIDTH=32 HEIGHT=32></A></TH> <TH><A HREF="brief.htm"><IMG SRC="back.gif" ALT="[back]" BORDER=0 WIDTH=32 HEIGHT=32></A></TH> <TH><A HREF="asemw.htm"><IMG SRC="next.gif" ALT="[next]" BORDER=0 WIDTH=32 HEIGHT=32></A></TH></TR></TABLE></CENTER></P></TD></TR></TABLE></BODY></HTML>⌨️ 快捷键说明
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