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https://github.com/ekeeke/Genesis-Plus-GX.git
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69 lines
3.1 KiB
C
69 lines
3.1 KiB
C
/***************************************************************************************
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* Genesis Plus
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* I/O controller
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*
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* Support for Master System (315-5216, 315-5237 & 315-5297), Game Gear & Mega Drive I/O chips
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*
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Charles Mac Donald (original code)
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* Copyright (C) 2007-2013 Eke-Eke (Genesis Plus GX)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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*
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* - Redistributions may not be sold, nor may they be used in a commercial
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* product or activity.
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*
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* - Redistributions that are modified from the original source must include the
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* complete source code, including the source code for all components used by a
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* binary built from the modified sources. However, as a special exception, the
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* source code distributed need not include anything that is normally distributed
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* (in either source or binary form) with the major components (compiler, kernel,
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* and so on) of the operating system on which the executable runs, unless that
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* component itself accompanies the executable.
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*
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* - Redistributions must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************************/
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#ifndef _IO_CTRL_H_
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#define _IO_CTRL_H_
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#define IO_RESET_HI 0x10
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#define IO_CONT1_HI 0x20
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#define REGION_JAPAN_NTSC 0x00
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#define REGION_JAPAN_PAL 0x40
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#define REGION_USA 0x80
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#define REGION_EUROPE 0xC0
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/* Global variables */
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extern uint8 io_reg[0x10];
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extern uint8 region_code;
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/* Function prototypes */
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extern void io_init(void);
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extern void io_reset(void);
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extern void io_68k_write(unsigned int offset, unsigned int data);
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extern unsigned int io_68k_read(unsigned int offset);
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extern void io_z80_write(unsigned int offset, unsigned int data, unsigned int cycles);
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extern unsigned int io_z80_read(unsigned int offset);
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extern void io_gg_write(unsigned int offset, unsigned int data);
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extern unsigned int io_gg_read(unsigned int offset);
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#endif /* _IO_CTRL_H_ */
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