mirror of
https://github.com/AppleWin/AppleWin.git
synced 2024-11-18 12:06:47 +00:00
3318abc622
- Replaced all non-GPL modules with GPL ones (6821, AY8910, Z80) . 6821 now from VICE (was MAME) . AY8910 now from FUSE (was MAME) . Z80 now from VICE (was Z80Em) - Fix for Willy Byte & MB support (strange 6522 behaviour!)
126 lines
3.5 KiB
C++
126 lines
3.5 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;
|
|
|
|
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;
|
|
}
|
|
// 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 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;
|
|
|
|
//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];
|
|
};
|