Category : C Source Code
Archive   : 25-43.ZIP
Filename : MAXLINES.C
* *
* Programmer: Eric E. Arneson CIS 76701,76 GEnie MS.ASSTSYOP *
* *
* Date: 1988-12-16 *
* *
* Procedure Name: int _maxlines(void) max lines of text on screen *
* *
* Discription: switches text mode to the max number of lines on screen *
* on a 100% IBM EGA and EGA Display: 43 line mode *
* on a 100% IBM VGA and VGA Display: 50 line mode *
* *
* Freeware! *
* *
\*****************************************************************************/
#include
#define CallVideoInt() result = int86x(0x10,&inregs, &outregs, &segregs)
int maxlines(void); /* this line should to be in any subprogram, */
/* making an "extern" call to _maxlines() */
int _maxlines(void)
{
union REGS inregs,outregs;
struct SREGS segregs;
int result;
inregs.x.ax = 0x1200; /* Get Config. Info. (Function 12h) */
inregs.x.bx = 0xff10; /* Get Config. Info. (SubFunction 10h) */
inregs.h.cl = 0x0f; /* Init. as a CGA 40x25 Secondary Adapter */
CallVideoInt();
if(outregs.h.cl < 0x0c) /* not set as a Secondary Adapter to an MDA */
if(outregs.h.bh <= 0x01) /* Type of Display */
if(outregs.h.bl <= 0x03) { /* Memory available on Adapter */
inregs.x.ax = 0x0003; /* Put into Co80 */
CallVideoInt();
inregs.x.ax = 0x1112; /* Load ROM 8 by 8 Font */
inregs.h.bl = 0x00; /* and Reprogram Controller */
CallVideoInt();
inregs.x.ax = 0x0100; /* Set Cursor Type */
inregs.x.cx = 0x0407; /* Starting/Ending line for Cursor */
CallVideoInt();
inregs.x.ax = 0x1200; /* Select Alternate PrintScreen */
inregs.x.bx = 0x0020;
CallVideoInt();
return(0); /* return 0 that means it was successful */
}
return(-1); /* return -1 that means it failed */
}
/******************************************\
* *
* This main() is only here for making this *
* a stand alone program. *
* *
\******************************************/
main()
{
_maxlines();
}
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