/* -*- C -*-

 * cia1.def - Definitions for the first MOS6526 (CIA) chip in the C64
 * ($DC00).
 *
 * Written by
 *   André Fachat (fachat@physik.tu-chemnitz.de)
 *   Ettore Perazzoli (ettore@comm2000.it)
 *
 * This file is part of VICE, the Versatile Commodore Emulator.
 * See README for copyright notice.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 *  02111-1307  USA.
 * */

#define mycpu maincpu

#define myclk maincpu_clk

#define mycia cia1

#define MYCIA CIA1


#define	cia1_set_int_clk		maincpu_set_irq_clk
#define	CIA1_INT			IK_IRQ

/* #define CIA1_TIMER_DEBUG */

INCLUDES()
{
#include "kbd.h"
#include "c64cia.h"
#ifdef HAVE_RS232
#include "rsuser.h"
#endif
}

PRE_CIA_FUNCS()
{
    /* Flag: Are the 3 C128 extended rows enabled?  */
    static int extended_keyboard_rows_enabled;

    /* Mask for the extended keyboard rows.  */
    static BYTE extended_keyboard_rows_mask;

    void cia1_enable_extended_keyboard_rows(int flag)
    {
	extended_keyboard_rows_enabled = flag;
    }

    void cia1_set_extended_keyboard_rows_mask(BYTE value)
    {
	extended_keyboard_rows_mask = value;
    }
}

#define RESET_CIA
#define	READ_SDR
#define STORE_CIAPA     cia1[addr] = byte;

STORE_SDR()
{
#ifdef HAVE_RS232
    if (rsuser_enabled) {
	userport_serial_write_sr(cia1[CIA_SDR]);
    }
#endif
}


STORE_CIAPB()
{
    {
	static int old_lp = 0x10;
	int new_lp;

	cia1[addr] = byte;

	/* Handle software-triggered light pen.  */
	new_lp = (cia1[CIA_PRB] | ~cia1[CIA_DDRB]) & 0x10;
	if (new_lp != old_lp) {
	    vic_ii_trigger_light_pen(rclk);
	    old_lp = new_lp;
	}
    }
}

READ_CIAPA()
{
    {
	BYTE val = cia1[CIA_PRA] | ~cia1[CIA_DDRA];
	BYTE msk = (cia1[CIA_PRB] | ~cia1[CIA_DDRB]) & ~joy[2];
	BYTE m;
	int i;

	for (m = 0x1, i = 0; i < 8; m <<= 1, i++)
	    if (!(msk & m))
		val &= ~rev_keyarr[i];
	byte = val & ~joy[2];
    }
}

READ_CIAPB()
{
    {
	BYTE val = ~cia1[CIA_DDRB];
	BYTE msk = (cia1[CIA_PRA] | ~cia1[CIA_DDRA]) & ~joy[1];
	BYTE m;
	int i;

	for (m = 0x1, i = 0; i < 8; m <<= 1, i++)
	    if (!(msk & m))
		val &= ~keyarr[i];

	if (extended_keyboard_rows_enabled)
	    for (m = 0x1, i = 8; i < 11; m <<= 1, i++)
		if (!(extended_keyboard_rows_mask & m))
		    val &= ~keyarr[i];

	byte = (val | (cia1[CIA_PRB] & cia1[CIA_DDRB])) & ~joy[1];
    }
}

#define READ_CIAICR

#define POST_CIA_FUNCS