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/***************************************************************************
sid6526.h - fake CIA timer for sidplay1
environment modes
-------------------
begin : Wed Jun 7 2000
copyright : (C) 2000 by Simon White
email : s_a_white@email.com
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
/***************************************************************************
* $Log: sid6526.h,v $
* Revision 1.3 2002/07/20 08:34:52 s_a_white
* Remove unnecessary and pointless conts.
*
* Revision 1.2 2002/03/11 18:00:29 s_a_white
* Better mirror sidplay1s handling of random numbers.
*
* Revision 1.1 2001/09/01 11:11:19 s_a_white
* This is the old fake6526 code required for sidplay1 environment modes.
*
***************************************************************************/
#ifndef _sid6526_h_
#define _sid6526_h_
#include "component.h"
#include "event.h"
#include "c64env.h"
class SID6526: public component
{
private:
static const char * const credit;
c64env &m_env;
EventContext &m_eventContext;
event_clock_t m_accessClk;
uint8_t regs[0x10];
uint8_t cra; // Timer A Control Register
uint_least16_t ta_latch;
uint_least16_t ta; // Current count (reduces to zero)
uint_least32_t rnd;
uint_least16_t m_count;
bool locked; // Prevent code changing CIA.
class TaEvent: public Event
{
private:
SID6526 &m_cia;
void event (void) {m_cia.event ();}
public:
TaEvent (SID6526 &cia)
:Event("CIA Timer A"),
m_cia(cia) {}
} m_taEvent;
public:
SID6526 (c64env *env);
//Common:
void reset (void);
uint8_t read (uint_least8_t addr);
void write (uint_least8_t addr, uint8_t data);
const char *credits (void) {return credit;}
const char *error (void) {return "";}
// Specific:
void event (void);
void clock (uint_least16_t count) { m_count = count; }
void lock () { locked = true; }
};
#endif // _sid6526_h_
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