141 lines
3.7 KiB
C++
141 lines
3.7 KiB
C++
#pragma once
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/*
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* mc6821.h - MC6821 emulation for the 1571 disk drives with DD3.
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*
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* Written by
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* Andreas Boose <viceteam@t-online.de>
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*
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* This file is part of VICE, the Versatile Commodore Emulator.
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* See README for copyright notice.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA.
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*
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*/
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typedef void (*mem_write_handler) (void* objTo, BYTE byData);
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typedef struct
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{
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void* objTo;
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mem_write_handler func;
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} STWriteHandler;
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struct mc6821_s {
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/* MC6821 register. */
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BYTE pra;
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BYTE ddra;
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BYTE cra;
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BYTE prb;
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BYTE ddrb;
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BYTE crb;
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/* Drive structure */
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// struct drive_s *drive;
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};
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typedef struct mc6821_s mc6821_t;
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class C6821
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{
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public:
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C6821()
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{
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mc6821_reset();
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m_stOutA.objTo = NULL;
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m_stOutA.func = NULL;
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m_stOutB.objTo = NULL;
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m_stOutB.func = NULL;
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};
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~C6821() {};
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// AppleWin:TC
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void SetPA(BYTE byData) { m_byIA = byData; }
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void SetPB(BYTE byData) { m_byIB = byData; }
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void Reset() { mc6821_reset(); }
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BYTE Read( BYTE byRS ) { return mc6821_read_internal(byRS); }
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void Write( BYTE byRS, BYTE byData ) { mc6821_store_internal(byRS, byData); }
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void SetListenerA(void *objTo, mem_write_handler func)
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{
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m_stOutA.objTo = objTo;
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m_stOutA.func = func;
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}
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void SetListenerB(void *objTo, mem_write_handler func)
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{
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m_stOutB.objTo = objTo;
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m_stOutB.func = func;
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}
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void Get6821(mc6821_t& r6821, BYTE& byIA, BYTE& byIB)
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{
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r6821 = mc6821[0];
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byIA = m_byIA;
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byIB = m_byIB;
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}
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void Set6821(const mc6821_t& r6821, const BYTE byIA, const BYTE byIB)
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{
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mc6821[0] = r6821;
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m_byIA = byIA;
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m_byIB = byIB;
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}
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// AppleWin:TC END
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private:
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/* Signal values (for signaling edges on the control lines) */
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#define MC6821_SIG_CA1 0
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#define MC6821_SIG_CA2 1
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#define MC6821_SIG_CB1 2
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#define MC6821_SIG_CB2 3
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//struct drive_s;
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//struct drive_context_s;
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void mc6821_init(/*struct drive_context_s *drv*/);
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void mc6821_reset(/*struct drive_context_s *drv*/);
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//extern void mc6821_mem_init(struct drive_context_s *drv, unsigned int type);
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void mc6821_set_signal(/*struct drive_context_s *drive_context,*/ int line);
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private:
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// AppleWin:TC
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void mc6821_write_pra(BYTE byte, unsigned int dnr=0);
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void mc6821_write_ddra(BYTE byte, unsigned int dnr=0);
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BYTE mc6821_read_pra(unsigned int dnr=0);
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void mc6821_write_prb(BYTE byte, unsigned int dnr=0);
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void mc6821_write_ddrb(BYTE byte, unsigned int dnr=0);
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BYTE mc6821_read_prb(unsigned int dnr=0);
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void mc6821_write_cra(BYTE byte, unsigned int dnr=0);
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void mc6821_write_crb(BYTE byte, unsigned int dnr=0);
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void mc6821_store_internal(WORD addr, BYTE byte, unsigned int dnr=0);
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BYTE mc6821_read_internal(WORD addr, unsigned int dnr=0);
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void mc6821_reset_internal(unsigned int dnr=0);
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// AppleWin:TC END
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private:
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// AppleWin:TC
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STWriteHandler m_stOutA;
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STWriteHandler m_stOutB;
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BYTE m_byIA; // InputA from 285
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BYTE m_byIB; // InputB from 285
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// AppleWin:TC END
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/* mc6821 structure. */
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#define DRIVE_NUM 1 // AppleWin:TC
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mc6821_t mc6821[DRIVE_NUM];
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};
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