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72 lines
1.3 KiB
C
72 lines
1.3 KiB
C
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/*
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* cputc.c
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*
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* void __fastcall__ cputcxy (unsigned char x, unsigned char y, char c);
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* void __fastcall__ cputc (char c);
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*/
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#include <conio.h>
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/* Implements a 25 by 25 screen in the 1024 bytes video ram (32 by 32) */
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#define LINEWIDTH 0x20
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#define SCREENBASE ((char *) 0xd000)
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#define TOP_OFFSET 4
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#define LEFT_OFFSET 3
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#define SCREENVISBASE (SCREENBASE + 4 * LINEWIDTH + LEFT_OFFSET)
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#define WIDTH 25
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#define HEIGHT 25
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static unsigned char xpos = 0;
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static unsigned char ypos = 0;
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void __fastcall__ cputc(char c)
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{
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char * const cp = SCREENVISBASE + ypos * LINEWIDTH + xpos;
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*cp = c;
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xpos += 1;
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if (xpos > WIDTH - 1) {
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xpos = 0;
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ypos += 1;
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if (ypos > HEIGHT - 1) {
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ypos = 0;
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}
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}
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}
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void __fastcall__ cputcxy (unsigned char x, unsigned char y, char c)
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{
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xpos = x > WIDTH - 1 ? WIDTH - 1 : x;
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ypos = y > HEIGHT - 1 ? HEIGHT - 1 : y;
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cputc(c);
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}
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unsigned char wherex (void)
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{
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return xpos;
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}
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unsigned char wherey (void)
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{
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return ypos;
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}
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void __fastcall__ gotox (unsigned char x)
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{
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xpos = x;
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}
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void __fastcall__ gotoy (unsigned char y)
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{
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ypos = y;
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}
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void __fastcall__ gotoxy (unsigned char x, unsigned char y)
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{
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xpos = x;
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ypos = y;
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}
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