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- /* Graphics support routines for this tutorial */
-
- extern unsigned char far *abuf; /* A000 buffer */
- extern int tx, ty, bx, by; /* Clipping variables, top and bottom */
- extern unsigned char currentcolor;
-
- extern void setvideomode (int mode);
- extern void setclipping (int x1, int y1, int x2, int y2);
- extern void drawcolor (unsigned char col);
- extern void setvga256 (void);
- extern void horizontal_line (int x1, int x2, int y);
- extern void drawpixel (int x, int y, unsigned char col);
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