mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-05 02:15:07 +01:00
28775cc3aa
---------- * added Mega CD / Sega CD hardware emulation (incl. Sub 68K, CDD, CDC, PCM, GFX rotation/scaling, etc) * added .ISO & .BIN CD image file support * added 512K backup cartridge RAM support * added savestate support for CD games NOTES: ~~~~~~ * to play CD games, original BIOS ROM files are required in /genplus/bios/ directory: unzip & rename them to bios_CD_U.bin, bios_CD_E.bin, bios_CD_J.bin * CD audio tracks (CD-DA) are not supported (yet) [Core/CPU] ---------- * modified 68k core for Mega CD / Sega CD support [Core/VDP] --------------- * improved DMA accuracy * added support for 8-bit VRAM writes with undocumented code value (verified on real hardware by Nemesis) [Gamecube/Wii] --------------- * modified Master System & Game Gear "BIOS" support (files should be named bios_U.sms, bios_J.sms, bios_E.sms & bios.gg and copied to /genplus/bios directory). * replaced "Hard Reset" button by a Soft Reset for systems having a Reset button (Mega Drive / Genesis & Master System) * State & SRAM files are now only compressed when saving to Gamecube Memory Cards * various fixes & cleanup. [Core/SCD] ---------- * added Mega CD / Sega CD hardware emulation (incl. Sub 68K, CDD, CDC, PCM, GFX rotation/scaling, etc) * added .ISO & .BIN CD image file support * added 512K backup cartridge RAM support * added savestate support for CD games NOTES: ~~~~~~ * to play CD games, original BIOS ROM files are required in /genplus/bios/ directory: unzip & rename them to bios_CD_U.bin, bios_CD_E.bin, bios_CD_J.bin * CD audio tracks (CD-DA) are not supported (yet) [Core/CPU] ---------- * modified 68k core for Mega CD / Sega CD support [Core/VDP] --------------- * improved DMA accuracy * added support for 8-bit VRAM writes with undocumented code value (verified on real hardware by Nemesis) [Gamecube/Wii] --------------- * modified Master System & Game Gear "BIOS" support (files should be named bios_U.sms, bios_J.sms, bios_E.sms & bios.gg and copied to /genplus/bios directory). * replaced "Hard Reset" button by a Soft Reset for systems having a Reset button (Mega Drive / Genesis & Master System) * State & SRAM files are now only compressed when saving to Gamecube Memory Cards * various fixes & cleanup.
78 lines
3.8 KiB
C
78 lines
3.8 KiB
C
/***************************************************************************************
|
|
* Genesis Plus
|
|
* Main 68k bus handlers
|
|
*
|
|
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Charles Mac Donald (original code)
|
|
* Copyright (C) 2007-2012 Eke-Eke (Genesis Plus GX)
|
|
*
|
|
* Redistribution and use of this code or any derivative works are permitted
|
|
* provided that the following conditions are met:
|
|
*
|
|
* - Redistributions may not be sold, nor may they be used in a commercial
|
|
* product or activity.
|
|
*
|
|
* - Redistributions that are modified from the original source must include the
|
|
* complete source code, including the source code for all components used by a
|
|
* binary built from the modified sources. However, as a special exception, the
|
|
* source code distributed need not include anything that is normally distributed
|
|
* (in either source or binary form) with the major components (compiler, kernel,
|
|
* and so on) of the operating system on which the executable runs, unless that
|
|
* component itself accompanies the executable.
|
|
*
|
|
* - Redistributions must reproduce the above copyright notice, this list of
|
|
* conditions and the following disclaimer in the documentation and/or other
|
|
* materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************************/
|
|
|
|
#ifndef _MEM68K_H_
|
|
#define _MEM68K_H_
|
|
|
|
/* unused areas */
|
|
extern unsigned int m68k_read_bus_8(unsigned int address);
|
|
extern unsigned int m68k_read_bus_16(unsigned int address);
|
|
extern void m68k_unused_8_w(unsigned int address, unsigned int data);
|
|
extern void m68k_unused_16_w(unsigned int address, unsigned int data);
|
|
|
|
/* illegal areas */
|
|
extern unsigned int m68k_lockup_r_8(unsigned int address);
|
|
extern unsigned int m68k_lockup_r_16(unsigned int address);
|
|
extern void m68k_lockup_w_8(unsigned int address, unsigned int data);
|
|
extern void m68k_lockup_w_16(unsigned int address, unsigned int data);
|
|
|
|
/* Z80 bus */
|
|
extern unsigned int z80_read_byte(unsigned int address);
|
|
extern unsigned int z80_read_word(unsigned int address);
|
|
extern void z80_write_byte(unsigned int address, unsigned int data);
|
|
extern void z80_write_word(unsigned int address, unsigned int data);
|
|
|
|
/* I/O & Control registers */
|
|
extern unsigned int ctrl_io_read_byte(unsigned int address);
|
|
extern unsigned int ctrl_io_read_word(unsigned int address);
|
|
extern void ctrl_io_write_byte(unsigned int address, unsigned int data);
|
|
extern void ctrl_io_write_word(unsigned int address, unsigned int data);
|
|
|
|
/* VDP */
|
|
extern unsigned int vdp_read_byte(unsigned int address);
|
|
extern unsigned int vdp_read_word(unsigned int address);
|
|
extern void vdp_write_byte(unsigned int address, unsigned int data);
|
|
extern void vdp_write_word(unsigned int address, unsigned int data);
|
|
|
|
/* PICO */
|
|
extern unsigned int pico_read_byte(unsigned int address);
|
|
extern unsigned int pico_read_word(unsigned int address);
|
|
|
|
#endif /* _MEM68K_H_ */
|