a814584c87
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9001 a1c6a512-1295-4272-9138-f99709370657
141 lines
4.7 KiB
C
141 lines
4.7 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Pacbox - a Pacman Emulator for Rockbox
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*
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* Based on PIE - Pacman Instructional Emulator
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*
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* Copyright (c) 1997-2003,2004 Alessandro Scotti
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* http://www.ascotti.org/
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef _HARDWARE_H
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#define _HARDWARE_H
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extern unsigned char ram_[20*1024]; // ROM (16K) and RAM (4K)
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extern unsigned char charset_rom_[4*1024]; // Character set ROM (4K)
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extern unsigned char spriteset_rom_[4*1024]; // Sprite set ROM (4K)
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extern unsigned char dirty_[1024];
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extern unsigned char video_mem_[1024]; // Video memory (1K)
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extern unsigned char color_mem_[1024]; // Color memory (1K)
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extern unsigned char charmap_[256*8*8]; /* Character data for 256 8x8 characters */
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extern unsigned char spritemap_[64*16*16]; /* Sprite data for 64 16x16 sprites */
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extern unsigned char output_devices_; /* Output flip-flops set by the game program */
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extern unsigned char interrupt_vector_;
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extern unsigned coin_counter_;
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extern unsigned char port1_;
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extern unsigned char port2_;
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extern unsigned char dip_switches_;
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/* Output flip-flops */
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enum {
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FlipScreen = 0x01,
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PlayerOneLight = 0x02,
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PlayerTwoLight = 0x04,
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InterruptEnabled = 0x08,
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SoundEnabled = 0x10,
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CoinLockout = 0x20,
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CoinMeter = 0x40,
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AuxBoardEnabled = 0x80
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};
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struct PacmanSprite
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{
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int mode; /** Display mode (normal or flipped) */
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int x; /** X coordinate */
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int y; /** Y coordinate */
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int n; /** Shape (from 0 to 63) */
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int color; /** Base color (0=not visible) */
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};
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/* Internal tables and structures for faster access to data */
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extern struct PacmanSprite sprites_[8]; /* Sprites */
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extern short vchar_to_i_[1024];
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void writeByte(unsigned addr, unsigned char b);
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unsigned char readPort( unsigned port );
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void writePort( unsigned addr, unsigned char b );
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void setOutputFlipFlop( unsigned char bit, unsigned char value );
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/*
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For Z80 Environment: read a byte from high memory addresses (i.e. the
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memory-mapped registers)
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*/
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static inline unsigned char readByte( unsigned addr )
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{
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addr &= 0xFFFF;
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if (addr < sizeof(ram_))
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return ram_[addr];
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// Address is not in RAM, check to see if it's a memory mapped register
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switch( addr & 0xFFC0 ) {
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// IN0
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case 0x5000:
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// bit 0 : up
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// bit 1 : left
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// bit 2 : right
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// bit 3 : down
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// bit 4 : switch: advance to next level
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// bit 5 : coin 1
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// bit 6 : coin 2
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// bit 7 : credit (same as coin but coin counter is not incremented)
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return port1_;
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// IN1
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case 0x5040:
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// bit 0 : up (2nd player)
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// bit 1 : left (2nd player)
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// bit 2 : right (2nd player)
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// bit 3 : down (2nd player)
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// bit 4 : switch: rack test -> 0x10=off, 0=on
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// bit 5 : start 1
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// bit 6 : start 2
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// bit 7 : cabinet -> 0x80=upright, 0x00=table
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return port2_;
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// DSW1
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case 0x5080:
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// bits 0,1 : coinage -> 0=free play, 1=1 coin/play, 2=1 coin/2 play, 3=2 coin/1 play
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// bits 2,3 : lives -> 0x0=1, 0x4=2, 0x8=3, 0xC=5
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// bits 4,5 : bonus life -> 0=10000, 0x10=15000, 0x20=20000, 0x30=none
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// bit 6 : jumper pad: difficulty -> 0x40=normal, 0=hard
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// bit 7 : jumper pad: ghost name -> 0x80=normal, 0=alternate
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return dip_switches_;
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// Watchdog reset
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case 0x50C0:
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break;
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}
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return 0xFF;
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}
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/* Reads a 16 bit word from memory at the specified address. */
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static inline unsigned readWord( unsigned addr ) {
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addr &= 0xFFFF;
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if (addr < (sizeof(ram_)-1)) {
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return ram_[addr] | ((ram_[addr+1]) << 8);
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} else {
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return readByte(addr) | (((unsigned)readByte(addr+1)) << 8);
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}
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}
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/* Writes a 16 bit word to memory at the specified address. */
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static inline void writeWord( unsigned addr, unsigned value ) {
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writeByte( addr, value & 0xFF );
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writeByte( addr+1, (value >> 8) & 0xFF );
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}
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#endif
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