AppleWin/source/6821.h
2016-03-21 23:48:02 +00:00

139 lines
3.7 KiB
C++

/*
* mc6821.h - MC6821 emulation for the 1571 disk drives with DD3.
*
* Written by
* Andreas Boose <viceteam@t-online.de>
*
* 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.
*
*/
typedef void (*mem_write_handler) (void* objTo, BYTE byData);
typedef struct
{
void* objTo;
mem_write_handler func;
} STWriteHandler;
struct mc6821_s {
/* MC6821 register. */
BYTE pra;
BYTE ddra;
BYTE cra;
BYTE prb;
BYTE ddrb;
BYTE crb;
/* Drive structure */
// struct drive_s *drive;
};
typedef struct mc6821_s mc6821_t;
class C6821
{
public:
C6821()
{
mc6821_reset();
m_stOutA.objTo = NULL;
m_stOutA.func = NULL;
m_stOutB.objTo = NULL;
m_stOutB.func = NULL;
};
~C6821() {};
// AppleWin:TC
void SetPA(BYTE byData) { m_byIA = byData; }
void SetPB(BYTE byData) { m_byIB = byData; }
void Reset() { mc6821_reset(); }
BYTE Read( BYTE byRS ) { return mc6821_read_internal(byRS); }
void Write( BYTE byRS, BYTE byData ) { mc6821_store_internal(byRS, byData); }
void SetListenerA(void *objTo, mem_write_handler func)
{
m_stOutA.objTo = objTo;
m_stOutA.func = func;
}
void SetListenerB(void *objTo, mem_write_handler func)
{
m_stOutB.objTo = objTo;
m_stOutB.func = func;
}
void Get6821(mc6821_t& r6821, BYTE& byIA, BYTE& byIB)
{
r6821 = mc6821[0];
byIA = m_byIA;
byIB = m_byIB;
}
void Set6821(const mc6821_t& r6821, const BYTE byIA, const BYTE byIB)
{
mc6821[0] = r6821;
m_byIA = byIA;
m_byIB = byIB;
}
// AppleWin:TC END
private:
/* Signal values (for signaling edges on the control lines) */
#define MC6821_SIG_CA1 0
#define MC6821_SIG_CA2 1
#define MC6821_SIG_CB1 2
#define MC6821_SIG_CB2 3
//struct drive_s;
//struct drive_context_s;
void mc6821_init(/*struct drive_context_s *drv*/);
void mc6821_reset(/*struct drive_context_s *drv*/);
//extern void mc6821_mem_init(struct drive_context_s *drv, unsigned int type);
void mc6821_set_signal(/*struct drive_context_s *drive_context,*/ int line);
private:
// AppleWin:TC
void mc6821_write_pra(BYTE byte, unsigned int dnr=0);
void mc6821_write_ddra(BYTE byte, unsigned int dnr=0);
BYTE mc6821_read_pra(unsigned int dnr=0);
void mc6821_write_prb(BYTE byte, unsigned int dnr=0);
void mc6821_write_ddrb(BYTE byte, unsigned int dnr=0);
BYTE mc6821_read_prb(unsigned int dnr=0);
void mc6821_write_cra(BYTE byte, unsigned int dnr=0);
void mc6821_write_crb(BYTE byte, unsigned int dnr=0);
void mc6821_store_internal(WORD addr, BYTE byte, unsigned int dnr=0);
BYTE mc6821_read_internal(WORD addr, unsigned int dnr=0);
void mc6821_reset_internal(unsigned int dnr=0);
// AppleWin:TC END
private:
// AppleWin:TC
STWriteHandler m_stOutA;
STWriteHandler m_stOutB;
BYTE m_byIA; // InputA from 285
BYTE m_byIB; // InputB from 285
// AppleWin:TC END
/* mc6821 structure. */
#define DRIVE_NUM 1 // AppleWin:TC
mc6821_t mc6821[DRIVE_NUM];
};