From: Charles Sandmann Newsgroups: comp.os.msdos.djgpp Subject: Re: Generate real-mode 386 DOS executables? Date: Mon, 13 Jan 2003 10:54:38 CST Organization: Rice University, Houston TX Lines: 12 Message-ID: <3e22ef4e.sandmann@clio.rice.edu> References: NNTP-Posting-Host: clio.rice.edu X-Trace: joe.rice.edu 1042477143 8881 128.42.105.3 (13 Jan 2003 16:59:03 GMT) X-Complaints-To: abuse AT rice DOT edu NNTP-Posting-Date: 13 Jan 2003 16:59:03 GMT X-NewsEditor: ED-1.5.9 To: djgpp AT delorie DOT com DJ-Gateway: from newsgroup comp.os.msdos.djgpp Reply-To: djgpp AT delorie DOT com > Hmm. Is the 32-bit real mode that Charles was talking about where the > address space is 32-bit, or where the operand size is 32-bit, or both? I referring to operand size. For example, BCC 5.0 supports a /3 switch which generates code which will only run on 386+ systems. It uses size overrides in real mode to support using 32-bit registers, operations and moves. This is faster than doing it in multiple 16-bit chunks, but not as fast as being in 32-bit mode to begin win. The original post indicated he was happy with 640K but wanted 32-bit support. It wasn't clear from that if he needed only 32-bit manipulations or simpler addressing. I think he just wanted faster code ...