// ---------------------------------------------------------------------------- // ___ ___ ___ ___ ___ ____ ___ _ _ // /__/ /__/ / / /__ /__/ /__ / /_ / |/ / // / / \ /__/ ___/ ___/ ___/ / /__ / / emulator // // ---------------------------------------------------------------------------- // Copyright 2005 Greg Stanton // // This program is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; either version 2 of the License, or // (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. // ---------------------------------------------------------------------------- // HighScore.cpp // // The HSC hardware uses the Toshiba TC5516APL chip which is 2048 x 8bit (2K) // and is maintained by a battery CR2032 at 3V // // With an SRAM of this vintage, the contents of an uninitialized / freshly // powered up chip would likely be random values. For emulation purposes, we // are initializing the SRAM contents on a fresh board as if they were zeros. // // With this emulation, each game gets their own private 2K SRAM for the // HSC memory. Further, to avoid problems with some games that do not initialize // the SRAM, we are going to use a fresh snapshot of the full 2K of SRAM right // after a known good cart (Asteroids - NTSC) has initialized the memory. // ---------------------------------------------------------------------------- #include #include #include #include "HighScore.h" #include "Cartridge.h" #include "Database.h" #define HS_SRAM_START 0x1000 // The 7800 RAM memory location of the high score cartridge SRAM #define HS_SRAM_SIZE 2048 // The size of the high score cartridge SRAM and gets loaded at 7800 memory address 0x1000 #define HSC_CART_ROM_SIZE 4096 // The highscore.rom is exactly 4K in size and gets loaded at 7800 memory address 0x3000 static byte high_score_sram[HS_SRAM_SIZE]; // Buffer for the actual 2K of HSC data static byte high_score_rom[HSC_CART_ROM_SIZE]; // Buffer for the 4K of high score ROM (highscore.rom) byte high_score_cart_loaded = false; // Flips to true if the High Score Cart is loaded in memory // ----------------------------------------------------------------------------------------------------- // This is a snapshot of an initialized HSC after Asteroids (NTSC) initialized it with the name "HSC" // A few of the modern homebrews don't do a good job of initializing the HSC and so we use this as // as default starting SRAM (of 0x00 before init) which is squeaky clean and ready for use by the game. // ----------------------------------------------------------------------------------------------------- unsigned char A7800DS_00_sram[HS_SRAM_SIZE] = { 0x00, 0x00, 0x68, 0x83, 0xaa, 0x55, 0x9c, 0x02, 0x07, 0x12, 0x02, 0x1f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 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if game is not supporting HSC) */ static char szName[256+4]; static void make_hsc_name(void) { // Init HSC filename is same as base filename with .hsc DIR* dir = opendir("sav"); if (dir) closedir(dir); // Directory exists... close it out and move on. else mkdir("sav", 0777); // Otherwise create the directory... sprintf(szName,"sav/%s", cartridge_filename); int len = strlen(szName); szName[len-3] = 'h'; szName[len-2] = 's'; szName[len-1] = 'c'; szName[len-0] = 0; } // ------------------------------------------------------------------------------------ // Write the full 2K of HSC - a bit wasteful for a single game but we've got plenty // of space and it turns out to be more flexibile for each game to have their own HSC. // ------------------------------------------------------------------------------------ bool cartridge_SaveHighScoreSram(void) { if(!high_score_cart_loaded || !myCartInfo.hsc) { return false; // If we didn't load the high score cartridge, or don't have an HSC enabled cart: don't save. } // Make sure something actually changed before writing... if (memcmp(high_score_sram, memory_ram+HS_SRAM_START, HS_SRAM_SIZE) != 0) { memcpy(high_score_sram, memory_ram+HS_SRAM_START, HS_SRAM_SIZE); // Copy from main memory to SRAM buffer make_hsc_name(); // HSC filename is same as base filename with .hsc extension // Write out the .hsc file FILE *handle = fopen(szName, "wb"); if (handle != NULL) { fwrite(high_score_sram, HS_SRAM_SIZE, 1, handle); fclose(handle); } } return true; // We at least made the attempt to write out the .hsc save file } /* * Loads the high score cartridge SRAM * * return Whether the load was successful */ static bool cartridge_LoadHighScoreSram(void) { if(!high_score_cart_loaded || !myCartInfo.hsc) { return false; // If we didn't load the high score cartridge, or don't have an HSC enabled cart: don't save. } make_hsc_name(); // HSC filename is same as base filename with .hsc extension // Read back the .hsc file FILE *handle = fopen(szName, "rb"); if (handle != NULL) { fread(high_score_sram, HS_SRAM_SIZE, 1, handle); fclose(handle); } else { // No .hsc file was available... so set the SRAM to a known good init value memcpy(high_score_sram, A7800DS_00_sram, HS_SRAM_SIZE); } // Copy from SRAM buffer to main memory for use by the game for(uint i = 0; i < HS_SRAM_SIZE; i++) { memory_Write(HS_SRAM_START + i, high_score_sram[i]); } bHSC_dirty = 0; // We don't consider the init of SRAM directly above to be a 'write' (no need to persist) return true; // HSC SRAM is ready to go! } /* * Loads the high score cartridge * * return Whether the load was successful */ bool cartridge_LoadHighScoreCart(void) { if( !myCartInfo.hsc || myCartInfo.region != 0 ) { return false; // Only load the cart if it is enabled and the region is NTSC } FILE* file = fopen("highscore.rom", "rb" ); // If we don't find it in the current directory, always try /roms/bios and /data/bios if (file == NULL) file = fopen("/roms/bios/highscore.rom", "rb" ); if (file == NULL) file = fopen("/data/bios/highscore.rom", "rb" ); if(file != NULL) { fread(high_score_rom, 1, HSC_CART_ROM_SIZE, file); for( uint i = 0; i < HSC_CART_ROM_SIZE; i++ ) { memory_Write(0x3000 + i, high_score_rom[i]); } high_score_cart_loaded = true; // Now read in the associated .hsc SRAM file (or set SRAM to defaults) cartridge_LoadHighScoreSram(); } else { high_score_cart_loaded = false; } return high_score_cart_loaded; } // End of file