From: "A.Appleyard" To: baca AT crl DOT ucsd DOT edu (Kevin Baca), DJGPP AT SUN DOT SOE DOT CLARKSON DOT EDU Date: Wed, 11 Jan 1995 09:35:31 GMT Subject: Re: 64K-color-mode screen addresses treated modulo 0x10000 I wrote:- > 64K-color-screen-mode screen byte pixel address offsets were still treated > modulo 0x10000 as before. Kevin Baca replied:- > ... I don't know exactly what your original question was. Anyway, in 64K > color mode (or any super VGA mode) all pixel addresses ARE modulo 0x10000. > Therefore, when you reach a 64K boundary, you need to do a page swap. This > can be done thru a BIOS call if your board supports VBE. ... I found that, on my PC in djgpp, any attempt (in my screen's 64K-color mode) to write a pixel at screen address Z (i.e. 0xd0000000+Z), instead displays at address (0xd0000000 + (Z & 0xffff)). What is VBE? It seems then, that to write to screen pixel (A*0x10000 + B), I can't simply store to address (0xd0000000 + 0x10000*A + B), but I must first swop to page A and then store to address (0xd0000000 + B). Is that correct? What interrupt with what arguments must I use to swop to page A here?