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pacbox - a Pacman arcade machine emulator. Currently working for all colour targets and the iriver H1x0. Requires the Pacman arcade machine ROMs in /.rockbox/pacman/

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9001 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dave Chapman 2006-03-11 15:44:35 +00:00
parent 1246668a78
commit a814584c87
13 changed files with 11079 additions and 1 deletions
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197
apps/plugins/pacbox/hardware.c Normal file
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Pacbox - a Pacman Emulator for Rockbox
*
* Based on PIE - Pacman Instructional Emulator
*
* Copyright (c) 1997-2003,2004 Alessandro Scotti
* http://www.ascotti.org/
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "plugin.h"
#include "hardware.h"
extern struct plugin_api* rb;
/* The main data for Pacman */
unsigned char ram_[20*1024] IBSS_ATTR; // ROM (16K) and RAM (4K)
unsigned char charset_rom_[4*1024] IBSS_ATTR; // Character set ROM (4K)
unsigned char spriteset_rom_[4*1024] IBSS_ATTR; // Sprite set ROM (4K)
unsigned char dirty_[1024] IBSS_ATTR;
unsigned char video_mem_[1024] IBSS_ATTR; // Video memory (1K)
unsigned char color_mem_[1024] IBSS_ATTR; // Color memory (1K)
unsigned char charmap_[256*8*8]; /* Character data for 256 8x8 characters */
unsigned char spritemap_[64*16*16]; /* Sprite data for 64 16x16 sprites */
unsigned char output_devices_ IBSS_ATTR; /* Output flip-flops set by the game program */
unsigned char interrupt_vector_ IBSS_ATTR;
unsigned coin_counter_ IBSS_ATTR;
unsigned char port1_ IBSS_ATTR;
unsigned char port2_ IBSS_ATTR;
unsigned char dip_switches_ IBSS_ATTR;
/* Internal tables and structures for faster access to data */
struct PacmanSprite sprites_[8]; /* Sprites */
short vchar_to_i_[1024];
/*
For Z80 Environment: write a byte to memory.
*/
void writeByte( unsigned addr, unsigned char b )
{
addr &= 0x7FFF;
if( addr < 0x4000 ) {
// This is a ROM address, do not write into it!
}
else if( addr < 0x4400 ) {
// Video memory
if (ram_[addr] != b) {
int x = vchar_to_i_[addr-0x4000];
ram_[addr] = b;
dirty_[x] = 1;
video_mem_[x] = b;
}
}
else if( addr < 0x4800 ) {
// Color memory
if (ram_[addr] != b) {
int x = vchar_to_i_[addr-0x4400];
ram_[addr] = b;
dirty_[x] = 1;
color_mem_[x] = b;
}
}
else if( addr < 0x4FF0 ) {
// Standard memory
ram_[addr] = b;
}
else if( addr < 0x5000 ) {
// Sprites
ram_[addr] = b;
unsigned idx = (addr - 0x4FF0) / 2;
if( addr & 1 ) {
sprites_[ idx ].color = b;
}
else {
sprites_[ idx ].n = b >> 2;
sprites_[ idx ].mode = b & 0x03;
}
}
else {
// Memory mapped ports
switch( addr ) {
case 0x5000:
// Interrupt enable
setOutputFlipFlop( InterruptEnabled, b & 0x01 );
break;
case 0x5001:
// Sound enable
setOutputFlipFlop( SoundEnabled, b & 0x01 );
break;
case 0x5002:
// Aux board enable?
break;
case 0x5003:
// Flip screen
setOutputFlipFlop( FlipScreen, b & 0x01 );
break;
case 0x5004:
// Player 1 start light
setOutputFlipFlop( PlayerOneLight, b & 0x01 );
break;
case 0x5005:
// Player 2 start light
setOutputFlipFlop( PlayerTwoLight, b & 0x01 );
break;
case 0x5006:
// Coin lockout: bit 0 is used to enable/disable the coin insert slots
// (0=disable).
// The coin slot is enabled at startup and (temporarily) disabled when
// the maximum number of credits (99) is inserted.
setOutputFlipFlop( CoinLockout, b & 0x01 );
break;
case 0x5007:
// Coin meter (coin counter incremented on 0/1 edge)
if( (output_devices_ & CoinMeter) == 0 && (b & 0x01) != 0 )
coin_counter_++;
setOutputFlipFlop( CoinMeter, b & 0x01 );
break;
case 0x50c0:
// Watchdog reset
break;
default:
if( addr >= 0x5040 && addr < 0x5060 ) {
// Sound registers
//SOUND sound_chip_.setRegister( addr-0x5040, b );
}
else if( addr >= 0x5060 && addr < 0x5070 ) {
// Sprite coordinates, x/y pairs for 8 sprites
unsigned idx = (addr-0x5060) / 2;
if( addr & 1 ) {
sprites_[ idx ].y = 272 - b + 1;
}
else {
sprites_[ idx ].x = 240 - b - 1;
if( idx <= 2 ) {
// In Pacman the first few sprites must be further offset
// to the left to get a correct display (is this a hack?)
sprites_[ idx ].x -= 1;
}
}
}
break;
}
}
}
/*
For Z80 Environment: read from a port.
Note: all ports in Pacman are memory mapped so they are read with readByte().
*/
unsigned char readPort( unsigned port )
{
(void)port;
return 0;
}
/*
For Z80 Environment: write to a port.
*/
void writePort( unsigned addr, unsigned char b )
{
if( addr == 0 ) {
// Sets the interrupt vector for the next CPU interrupt
interrupt_vector_ = b;
}
}
void setOutputFlipFlop( unsigned char bit, unsigned char value )
{
if( value ) {
output_devices_ |= bit;
}
else {
output_devices_ &= ~bit;
}
}