mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-12-27 19:51:48 +01:00
69 lines
3.1 KiB
C
69 lines
3.1 KiB
C
/***************************************************************************************
|
|
* Genesis Plus
|
|
* I/O controller
|
|
*
|
|
* Support for Master System (315-5216, 315-5237 & 315-5297), Game Gear & Mega Drive I/O chips
|
|
*
|
|
* 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 _IO_CTRL_H_
|
|
#define _IO_CTRL_H_
|
|
|
|
#define IO_RESET_HI 0x10
|
|
#define IO_CONT1_HI 0x20
|
|
|
|
#define REGION_JAPAN_NTSC 0x00
|
|
#define REGION_JAPAN_PAL 0x40
|
|
#define REGION_USA 0x80
|
|
#define REGION_EUROPE 0xC0
|
|
|
|
/* Global variables */
|
|
extern uint8 io_reg[0x10];
|
|
extern uint8 region_code;
|
|
|
|
/* Function prototypes */
|
|
extern void io_init(void);
|
|
extern void io_reset(void);
|
|
extern void io_68k_write(unsigned int offset, unsigned int data);
|
|
extern unsigned int io_68k_read(unsigned int offset);
|
|
extern void io_z80_write(unsigned int offset, unsigned int data, unsigned int cycles);
|
|
extern unsigned int io_z80_read(unsigned int offset);
|
|
extern void io_gg_write(unsigned int offset, unsigned int data);
|
|
extern unsigned int io_gg_read(unsigned int offset);
|
|
|
|
#endif /* _IO_CTRL_H_ */
|
|
|