From: "AndrewJ" Newsgroups: comp.os.msdos.djgpp References: <4698esg56ttr8u6sfedrtdvsjovi2s6dpg AT 4ax DOT com> Subject: Re: Vesa is a pain help please Lines: 35 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.00.2919.6600 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6600 Message-ID: Date: Sat, 01 Apr 2000 11:53:05 GMT NNTP-Posting-Host: 24.42.120.18 X-Complaints-To: abuse AT home DOT net X-Trace: news2.rdc1.on.home.com 954589985 24.42.120.18 (Sat, 01 Apr 2000 03:53:05 PST) NNTP-Posting-Date: Sat, 01 Apr 2000 03:53:05 PST Organization: @Home Network Canada To: djgpp AT delorie DOT com DJ-Gateway: from newsgroup comp.os.msdos.djgpp Reply-To: djgpp AT delorie DOT com [snip] > union REGS regs; > regs.x.ax = 0x4F02; /* change display mode */ > regs.x.bx = 117; /* three-digit mode number */ > int86(0x10, ®s, ®s); /* Call the BIOS (int10) */ > if(regs.h.al != 0x4F) > { > printf("VESA modes NOT supported!\n"); > } [snip] Well, I see one problem right off the bat. Mode numbers are generally given in hex, NOT decimal, so when your trying to set it to mode 117, you're giving it an invalid vesa mode (0x75, which isn't even a vesa mode). Try setting it to mode 0x0117 instead and you should get proper results. Secondly, going with the assumption that this would be a complete program, you aren't following the recommended steps for use vesa. Ideally you should be allocating a block of real-mode memory (dpmi functions will do this), getting the vbe information to check that vbe is actually installed (unless you only intend to use this on your system and you know you have vbe), going through the mode list pointer getting information about each mode until you find the one that corresponds to the mode you want, and *then* setting the mode. In VBE 2+ it was no longer required by the specification to continue using fixed mode numbers for various modes, so in theory mode 0x0117 might not even be 1024x768x16bpp on your system (although I've yet to hear about a card that didn't retain all the old VBE 1.x mode numbers). Hope this helps, AndrewJ