/* * capture.c - Cartridge handling, Capture cart. * * Written by * Groepaz * * This file is part of VICE, the Versatile Commodore Emulator. * See README for copyright notice. * * 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., 59 Temple Place, Suite 330, Boston, MA * 02111-1307 USA. * */ #include "vice.h" #include #include #define CARTRIDGE_INCLUDE_SLOTMAIN_API #include "c64cartsystem.h" #undef CARTRIDGE_INCLUDE_SLOTMAIN_API #include "c64mem.h" #include "c64memrom.h" #include "capture.h" #include "cartio.h" #include "cartridge.h" #include "export.h" #include "ram.h" #include "snapshot.h" #include "types.h" #include "util.h" #include "crt.h" /* Jason Ranheim "Capture" Cartridge - 8K ROM (mapped to e000) - 8K RAM (mapped to 6000) 7474 - 2 D-Flipflops (cart_enabled, register_enabled) 74125 - 4 Tri-State Buffers 74133 - NAND with 13 Inputs (adress decoder) the cartridge is disabled after a reset. when the freeze button is pressed the following happens: - an NMI is generated - as soon as the current adress is in bank 0xfe the cart switches to ultimax mode. the cart rom then contains one page full of "jmp $eaea", which ultimatively calls the freezer code. - the fff7/fff8 "register" logic is enabled after that any access (read or write) to $fff7 will turn the cart_enabled off (leave ultimax mode), and an access to $fff8 will turn the cart back on (enter ultimax mode). the "register logic" that causes this can only be disabled again by a hardware reset. */ /* ... program is loaded to $0800, then: .C:fad3 A0 00 LDY #$00 .C:fad5 B9 00 08 LDA $0800,Y .C:fad8 C0 03 CPY #$03 .C:fada B0 05 BCS $FAE1 .C:fadc D9 F8 FF CMP $FFF8,Y ; "4a 59 43" "JYC" .C:fadf D0 0C BNE $FAED .C:fae1 59 00 FE EOR $FE00,Y .C:fae4 99 00 08 STA $0800,Y .C:fae7 C8 INY .C:fae8 D0 EB BNE $FAD5 .C:faea 6C 04 08 JMP ($0804) .C:faed 60 RTS */ /* #define DBGCAPTURE */ #ifdef DBGCAPTURE #define DBG(x) printf x #else #define DBG(x) #endif static const export_resource_t export_res = { CARTRIDGE_NAME_CAPTURE, 1, 1, NULL, NULL, CARTRIDGE_CAPTURE }; #define CART_RAM_SIZE (8 * 1024) static int cart_enabled = 0; static int freeze_pressed = 0; static int register_enabled = 0; static int romh_enabled = 0; static void capture_reg(uint16_t addr) { if (register_enabled) { if ((addr & 0xffff) == 0xfff7) { cart_enabled = 0; DBG(("CAPTURE: enable: %d\n", cart_enabled)); } else if ((addr & 0xffff) == 0xfff8) { cart_enabled = 1; DBG(("CAPTURE: enable: %d\n", cart_enabled)); } else if ((addr & 0xffff) == 0xfff9) { if ((!freeze_pressed) && (!romh_enabled)) { /* HACK: this one is needed to survive the ram clearing loop */ cart_enabled = 0; DBG(("CAPTURE: enable: %d\n", cart_enabled)); } } } } static void capture_romhflip(uint16_t addr) { if (freeze_pressed) { if ((addr & 0xff00) == 0xfe00) { freeze_pressed = 0; romh_enabled = 1; DBG(("CAPTURE: romh enable: %d\n", romh_enabled)); } } } uint8_t capture_romh_read(uint16_t addr) { capture_reg(addr); capture_romhflip(addr); if (cart_enabled) { if (romh_enabled) { return romh_banks[(addr & 0x1fff)]; } } return mem_read_without_ultimax(addr); } void capture_romh_store(uint16_t addr, uint8_t value) { capture_reg(addr); /* capture_romhflip(addr); */ if (cart_enabled == 0) { mem_store_without_ultimax(addr, value); } } /* there is Cartridge RAM at 0x6000..0x7fff */ uint8_t capture_1000_7fff_read(uint16_t addr) { if (cart_enabled) { if (addr >= 0x6000) { return export_ram0[addr - 0x6000]; } } return mem_read_without_ultimax(addr); } void capture_1000_7fff_store(uint16_t addr, uint8_t value) { if (cart_enabled) { if (addr >= 0x6000) { export_ram0[addr - 0x6000] = value; } } else { mem_store_without_ultimax(addr, value); } } int capture_romh_phi1_read(uint16_t addr, uint8_t *value) { return CART_READ_C64MEM; } int capture_romh_phi2_read(uint16_t addr, uint8_t *value) { return capture_romh_phi1_read(addr, value); } int capture_peek_mem(export_t *ex, uint16_t addr, uint8_t *value) { if (cart_enabled == 1) { if (addr >= 0x6000 && addr <= 0x7fff) { *value = export_ram0[addr - 0x6000]; return CART_READ_VALID; } if (romh_enabled) { if (addr >= 0xe000) { *value = romh_banks[addr & 0x1fff]; return CART_READ_VALID; } } } return CART_READ_THROUGH; } /******************************************************************************/ /* FIXME: this still needs to be tweaked to match the hardware */ static RAMINITPARAM ramparam = { .start_value = 255, .value_invert = 2, .value_offset = 1, .pattern_invert = 0x100, .pattern_invert_value = 255, .random_start = 0, .random_repeat = 0, .random_chance = 0, }; void capture_powerup(void) { ram_init_with_pattern(export_ram0, CART_RAM_SIZE, &ramparam); } void capture_freeze(void) { DBG(("CAPTURE: freeze\n")); if (freeze_pressed == 0) { cart_config_changed_slotmain(CMODE_RAM, CMODE_ULTIMAX, CMODE_READ | CMODE_RELEASE_FREEZE); cart_enabled = 1; freeze_pressed = 1; register_enabled = 1; romh_enabled = 0; } } void capture_config_init(void) { DBG(("CAPTURE: config init\n")); cart_config_changed_slotmain(CMODE_RAM, CMODE_RAM, CMODE_READ); } void capture_reset(void) { DBG(("CAPTURE: reset\n")); cart_enabled = 0; register_enabled = 0; freeze_pressed = 0; cart_config_changed_slotmain(CMODE_RAM, CMODE_RAM, CMODE_READ); } void capture_config_setup(uint8_t *rawcart) { DBG(("CAPTURE: config setup\n")); memcpy(romh_banks, rawcart, 0x2000); memset(export_ram0, 0, 0x2000); cart_config_changed_slotmain(2, 2, CMODE_READ); } static int capture_common_attach(void) { DBG(("CAPTURE: attach\n")); if (export_add(&export_res) < 0) { return -1; } return 0; } int capture_bin_attach(const char *filename, uint8_t *rawcart) { if (util_file_load(filename, rawcart, 0x2000, UTIL_FILE_LOAD_SKIP_ADDRESS) < 0) { return -1; } return capture_common_attach(); } int capture_crt_attach(FILE *fd, uint8_t *rawcart) { crt_chip_header_t chip; if (crt_read_chip_header(&chip, fd)) { return -1; } if (chip.size != 0x2000) { return -1; } if (crt_read_chip(rawcart, 0, &chip, fd)) { return -1; } return capture_common_attach(); } void capture_detach(void) { export_remove(&export_res); } /* ---------------------------------------------------------------------*/ /* CARTCAPTURE snapshot module format: type | name | description ------------------------------------- BYTE | enabled | cartridge enabled flag BYTE | freeze pressed | freeze button pressed flag BYTE | register enable | register enable flag BYTE | ROMH enable | ROMH enable flag ARRAY | ROMH | 8192 BYTES of ROMH data ARRAY | RAM | 8192 BYTES of RAM data */ static const char snap_module_name[] = "CARTCAPTURE"; #define SNAP_MAJOR 0 #define SNAP_MINOR 0 int capture_snapshot_write_module(snapshot_t *s) { snapshot_module_t *m; m = snapshot_module_create(s, snap_module_name, SNAP_MAJOR, SNAP_MINOR); if (m == NULL) { return -1; } if (0 || (SMW_B(m, (uint8_t)cart_enabled) < 0) || (SMW_B(m, (uint8_t)freeze_pressed) < 0) || (SMW_B(m, (uint8_t)register_enabled) < 0) || (SMW_B(m, (uint8_t)romh_enabled) < 0) || (SMW_BA(m, romh_banks, 0x2000) < 0) || (SMW_BA(m, export_ram0, 0x2000) < 0)) { snapshot_module_close(m); return -1; } return snapshot_module_close(m); } int capture_snapshot_read_module(snapshot_t *s) { uint8_t vmajor, vminor; snapshot_module_t *m; m = snapshot_module_open(s, snap_module_name, &vmajor, &vminor); if (m == NULL) { return -1; } /* Do not accept versions higher than current */ if (snapshot_version_is_bigger(vmajor, vminor, SNAP_MAJOR, SNAP_MINOR)) { snapshot_set_error(SNAPSHOT_MODULE_HIGHER_VERSION); goto fail; } if (0 || (SMR_B_INT(m, &cart_enabled) < 0) || (SMR_B_INT(m, &freeze_pressed) < 0) || (SMR_B_INT(m, ®ister_enabled) < 0) || (SMR_B_INT(m, &romh_enabled) < 0) || (SMR_BA(m, romh_banks, 0x2000) < 0) || (SMR_BA(m, export_ram0, 0x2000) < 0)) { goto fail; } snapshot_module_close(m); return capture_common_attach(); fail: snapshot_module_close(m); return -1; }