C02/x16/include/vera.h02

/***************************************************
 * vera.h02 - Commander X16 Routines for Vera chip *
 ***************************************************/

/* Convert Palette Color Value *
 * to R, G, and B Values       *
 * Args: int c - Color Value   *
 * Returns: Red Value (0-15)   *
 *          Green Value (0-15) *
 *          Blue Value (0-15)  */
char clrrgb();

/* Read Color Value from Palette *
 * Args: char i - Palette Index  *
 * Returns: int c - Color Value  */
char getclr();

/* Read Display Controller Register *
 * Args: char r - Register Offset   *
 * Returns: char v - Register Value */
char getdcr();

/* Read Video Output Mode       *
 * Returns: m - Output Mode     *
 *          c - Chroma Disabled *
 *          f - Current Field   */
char getvid();

/* Convert R, G, and B Values   *
 * to Palette Color Value       *
 * Args: r - Red Value (0-15)   *
 *       g - Green Value (0-15) *
 *       b - Blue Value (0-15)  *
 * Returns: int c - Color Value */
char rgbclr();

/* Write Color Value to Palette   *
 * Args: i - Index into Palette   *
 *       int c - Color Value      *
 * Returns: int d = Entry Address */
char setclr();