murphys@cod.NOSC.MIL (Steven P. Murphy) (07/06/88)
The following is a very fast way to write to the screen buffer. I how this help the person who ask how to point to the frame buffer. compile with MSC 5.0 using > cl -AC tst.c ------------------------- cut here ------------------------------ #include <string.h> #define SCRBUF 0xb8000000L typedef struct SCRN_CELL { unsigned char chr; /* character */ unsigned char att; /* attribute */ } CELL; CELL dspbuf[25][80]; main() { int i,j; for(j = 10; j <= 20; j++) for( i = 10; i <= 60; i++) { dspbuf[j][i].chr = 0x01; /* smily */ dspbuf[j][i].att = 0x70; /* inverse */ } memmove((char far *)SCRBUF, dspbuf, 4000); } ------------------------- cut here ---------------------------- it is fast because you write to a merory buffer first and then update the screen with memmove. memove is used because in MSC 5.0 it takes care of overlapping regons where memcpy does not. ------------------------------------------- _ _ _ Clarke's law, 2nd varation: ' ) ) ) / / / / . . __ _ /_ "Any sufficiently advanced technology / ' (_(_/_/ (_/_)_/ /_ is indistinguishable from a rigged demo" / ' ------------------------ S. P. Murphy Internet: murphys@cod.nosc.mil UUCP: {ucbvax,hplabs}!sdcsvax!nosc!murphys