Управление видеопамятью Турбо Си

// ****** Control videoadapter ................ * /
#include <dos.h>
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <time.h>
//***************Constanty */
#define VSEG 0xb800    /* video memory segment address*/
#define byte unsigned char#define word unsigned int
#define Esc 27
#define Spase 32
#define Enter 13
#define Up 0x48
#define Down 0x50
#define Left 0x4b
#define Right 0x4d
#define Home 0x47
int xk,yk;
//*****Reading a character from the video memory*/
byte GetSym(x1,y1)
int x1,y1;
{
return(peekb(VSEG,y1*160+x1*2));
}
//****read from the video memory*/
byte GetAtr(x1,y1)
int x1,y1;
{
return(peekb(VSEG,y1*160+x1*2+1));
}
//****Write a character in the video memory*/
void PutSym(x1,y1,sym)
int x1,y1;
byte sym;
{
pokeb(VSEG,y1*160+x1*2,sym);
}
//****Record attribute to video memory*/
void PutAtr(x1,y1,atr)
int x1,y1;
byte atr;
{
pokeb(VSEG,y1*160+x1*2+1,atr);
}
//***The inversion of a square on the screen*/
void Invert(x1,y1)
int x1,y1;
{
byte b;
int i,j;
for (j=0;j<5;j++)for (i=0;i<10;i++)
{
b=GetAtr(x1*10+i,y1*5+j);
PutAtr(x1*10+i,y1*5+j,(b^0x7f));
}
}
//***Replacing the current square in the upper left*/
void Change(x,y)
byte x,y;
{
int i,j;
byte ba,bs;
if ((x!=0)||(y!=0))
for (j=0;j<5;j++)
for (i=0;i<10;i++)
{
bs=GetSym(x*10+i,y*5+j);
ba=GetAtr(x*10+i,y*5+j);
PutSym(x*10+i,y*5+j,GetSym(i,j));
PutAtr(x*10+i,y*5+j,GetAtr(i,j));
PutSym(i,j,bs);
PutAtr(i,j,ba);
}
}
//***Stirring squares until you press*/
void RandText(void)
{
Invert(xk,yk);
xk=5;
yk=1;
while(!kbhit())
{
Change(xk,yk);
xk++;
if (xk>7) xk=0;
yk++;
if (yk>4) yk=0;
}
Invert(xk,yk);
}
//******Start the main program*/
main(int argn,char *argc[])
{int i;
xk=0;
yk=0;
if (argn>1){}
else     / /* If the parameter is not present, the output instructions*/
{
textattr(10);
clrscr();
cprintf(""""""""""""""""");
cprintf("   Laboratorna rabota  N5       ");
cprintf(""""""""""""""""");
cprintf(""""""""""""""""");
cprintf("  Control videoadapter.      ");
cprintf(""""""""""""""""");
textattr(15);
gotoxy(23,4);cprintf("Demonstration of video memory.");
textattr(12);
gotoxy(30,6);cprintf("<< MOZAIKA >>");
textattr(14);
gotoxy(30,8);cprintf("control keys:");
gotoxy(7,10);cprintf("< Left, Right, Up, Down> — ");
cprintf("square dedicated management.");
gotoxy(7,11);cprintf("<Spase Bar> — Sharing content ");
cprintf("between the selected square");
gotoxy(7,12);cprintf("      and the upper left");
cprintf(" квадратом.");
gotoxy(7,13);cprintf("<Enter> — squares mixing");
cprintf(" until you press any key.");
gotoxy(7,14);cprintf("<Esc> — Entrance.");
textattr(11);
gotoxy(28,16);cprintf("ZADACHA GAME :");
gotoxy(14,17);cprintf("Absorb with keys");
cprintf("management initial screen.");
textattr(12);
gotoxy(27,19);cprintf("Zelaem uspeha!");
textattr(7);
gotoxy(1,21);cprintf("Note: When you start with ");
cprintf("parameter<<>");
gotoxy(13,22);cprintf("the initial screen for the game");
cprintf("is the current.");
}
Invert(xk,yk);for(i=0;i==0;)
switch(getch())
{ //* Processing of keypresses */
case Esc: i++; break;
case Enter:RandText();break;
case Spase:Invert(xk,yk);
Change(xk,yk);
Invert(xk,yk);
break;
case 0:
switch (getch()) {
case Left:Invert(xk,yk);
xkkk;
if(xk<0) xk=7;
Invert(xk,yk);
break;
case Right:Invert(xk,yk);
xk++;
if(xk>7) xk=0;
Invert(xk,yk);
break;
case  Up:Invert(xk,yk);
ykkk;
if(yk<0) yk=4;
Invert(xk,yk);
break;
case Down:Invert(xk,yk);
yk++;
if(yk>4) yk=0;
Invert(xk,yk);
break;
}
}
Invert(xk,yk);
}

//***************Constanty */
#define VSEG 0xb800    /* video memory segment address*/
#define byte unsigned char
#define word unsigned int
#define Esc 27
#define Spase 32
#define Enter 13
#define Up 0x48
#define Down 0x50
#define Left 0x4b
#define Right 0x4d
#define Home 0x47