_6526.h

6502 c compiler free open source

/*****************************************************************************/
/*                                                                           */
/*				    _6526.h				     */
/*                                                                           */
/*		  Internal include file, do not use directly		     */
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/* (C) 1998-2000 Ullrich von Bassewitz                                       */
/*               Wacholderweg 14                                             */
/*               D-70597 Stuttgart                                           */
/* EMail:        [e-mail]                                            */
/*                                                                           */
/*                                                                           */
/* This software is provided 'as-is', without any expressed or implied       */
/* warranty.  In no event will the authors be held liable for any damages    */
/* arising from the use of this software.                                    */
/*                                                                           */
/* Permission is granted to anyone to use this software for any purpose,     */
/* including commercial applications, and to alter it and redistribute it    */
/* freely, subject to the following restrictions:                            */
/*                                                                           */
/* 1. The origin of this software must not be misrepresented; you must not   */
/*    claim that you wrote the original software. If you use this software   */
/*    in a product, an acknowledgment in the product documentation would be  */
/*    appreciated but is not required.                                       */
/* 2. Altered source versions must be plainly marked as such, and must not   */
/*    be misrepresented as being the original software.                      */
/* 3. This notice may not be removed or altered from any source              */
/*    distribution.                                                          */
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/*****************************************************************************/



#ifndef __6526_H
#define __6526_H



/* Define a structure with the 6526 register offsets.
 * NOTE: The timer registers are not declared as 16 bit registers, because
 * the order in which the two 8 bit halves are written is important, and
 * the compiler doesn't guarantee any order when writing 16 bit values.
 */
struct __6526 {
    unsigned char	pra;		/* Port register A */
    unsigned char	prb;		/* Port register B */
    unsigned char	ddra;		/* Data direction register A */
    unsigned char	ddrb;		/* Data direction register B */
    unsigned char	ta_lo;		/* Timer A, low byte */
    unsigned char	ta_hi;		/* Timer A, high byte */
    unsigned char      	tb_lo; 	       	/* Timer B, low byte */
    unsigned char	tb_hi;		/* Timer B, high byte */
    unsigned char      	tod_10;		/* TOD, 1/10 sec. */
    unsigned char	tod_sec;	/* TOD, seconds */
    unsigned char	tod_min;	/* TOD, minutes */
    unsigned char	tod_hour;	/* TOD, hours */
    unsigned char	sdr;		/* Serial data register */
    unsigned char	icr;		/* Interrupt control register */
    unsigned char	cra;		/* Control register A */
    unsigned char	crb;		/* Control register B */
};



/* End of _6526.h */
#endif