/* * delaep7x8.c - Cartridge handling, Dela EP7x8kb cart. * * Written by * Marco van den Heuvel * * 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 #include #define CARTRIDGE_INCLUDE_SLOTMAIN_API #include "c64cartsystem.h" #undef CARTRIDGE_INCLUDE_SLOTMAIN_API #include "cartio.h" #include "cartridge.h" #include "delaep7x8.h" #include "export.h" #include "monitor.h" #include "snapshot.h" #include "types.h" #include "util.h" #include "crt.h" /* This eprom system by DELA seems to be a bit more advanced than the EP64 and EP256. It can handle what the EP64 can handle, plus the following features : - Alternate rom at $8000 - Alternate basic at $A000 - Extended basic - Basic programs - Simulated 16kb roms - Kernel replacement The system uses 8 8kb eproms, of which the first is used for the base menu. 7 8kb banks are used for above named features. Because of the fact that this system supports switching in a different eprom at $8000 (followed by a reset) it is possible to place generic 8kb carts (games/tools) in the eproms and use them. The bank selecting is done by writing to $DE00. Each low bit is used to bank in the respective eprom. If all bits are high then the EXROM is switched off. The bit values for each eprom bank is: eprom bank 1 : 11111110 ($FE) (base eprom) eprom bank 2 : 11111101 ($FD) eprom bank 3 : 11111011 ($FB) eprom bank 4 : 11110111 ($F7) eprom bank 5 : 11101111 ($EF) eprom bank 6 : 11011111 ($DF) eprom bank 7 : 10111111 ($BF) eprom bank 8 : 01111111 ($7F) EXROM off : 11111111 ($FF) */ /* ---------------------------------------------------------------------*/ static int currbank = 0; static uint8_t regval = 0xfe; static void delaep7x8_io1_store(uint16_t addr, uint8_t value) { uint8_t bank, config, test_value; regval = value; /* Each bit of the register set to low activates a respective EPROM, $FF switches off EXROM */ config = (value == 0xff) ? 2 : 0; cart_config_changed_slotmain(config, config, CMODE_WRITE); bank = 0; test_value = (~value); while (test_value != 0) { bank++; test_value = (test_value >> 1); } if (bank != 0) { cart_romlbank_set_slotmain(bank - 1); currbank = bank - 1; } } static uint8_t delaep7x8_io1_peek(uint16_t addr) { return regval; } static int delaep7x8_dump(void) { mon_out("Currently active EPROM bank: %d, cart status: %s\n", currbank, (regval == 0xff) ? "Disabled" : "Enabled"); return 0; } /* ---------------------------------------------------------------------*/ static io_source_t delaep7x8_device = { CARTRIDGE_NAME_DELA_EP7x8, /* name of the device */ IO_DETACH_CART, /* use cartridge ID to detach the device when involved in a read-collision */ IO_DETACH_NO_RESOURCE, /* does not use a resource for detach */ 0xde00, 0xdeff, 0xff, /* range for the device, address is ignored, reg:$de00, mirrors:$de01-$deff */ 0, /* read is never valid, device is write only */ delaep7x8_io1_store, /* store function */ NULL, /* NO poke function */ NULL, /* NO read function */ delaep7x8_io1_peek, /* peek function */ delaep7x8_dump, /* device state information dump function */ CARTRIDGE_DELA_EP7x8, /* cartridge ID */ IO_PRIO_NORMAL, /* normal priority, device read needs to be checked for collisions */ 0, /* insertion order, gets filled in by the registration function */ IO_MIRROR_NONE /* NO mirroring */ }; static io_source_list_t *delaep7x8_list_item = NULL; static const export_resource_t export_res = { CARTRIDGE_NAME_DELA_EP7x8, 0, 1, &delaep7x8_device, NULL, CARTRIDGE_DELA_EP7x8 }; /* ---------------------------------------------------------------------*/ void delaep7x8_config_init(void) { cart_config_changed_slotmain(CMODE_8KGAME, CMODE_8KGAME, CMODE_READ); cart_romlbank_set_slotmain(0); } void delaep7x8_config_setup(uint8_t *rawcart) { memcpy(roml_banks, rawcart, 0x2000 * 8); cart_config_changed_slotmain(CMODE_8KGAME, CMODE_8KGAME, CMODE_READ); cart_romlbank_set_slotmain(0); } /* ---------------------------------------------------------------------*/ static int delaep7x8_common_attach(void) { if (export_add(&export_res) < 0) { return -1; } delaep7x8_list_item = io_source_register(&delaep7x8_device); return 0; } int delaep7x8_bin_attach(const char *filename, uint8_t *rawcart) { int size = 0x10000; memset(rawcart, 0xff, 0x10000); while (size != 0) { if (util_file_load(filename, rawcart, size, UTIL_FILE_LOAD_SKIP_ADDRESS) < 0) { size -= 0x2000; } else { return delaep7x8_common_attach(); } } return -1; } int delaep7x8_crt_attach(FILE *fd, uint8_t *rawcart) { crt_chip_header_t chip; memset(rawcart, 0xff, 0x10000); while (1) { if (crt_read_chip_header(&chip, fd)) { break; } if (chip.bank > 7 || chip.size != 0x2000) { return -1; } if (crt_read_chip(rawcart, chip.bank << 13, &chip, fd)) { return -1; } } return delaep7x8_common_attach(); } void delaep7x8_detach(void) { export_remove(&export_res); io_source_unregister(delaep7x8_list_item); delaep7x8_list_item = NULL; } /* ---------------------------------------------------------------------*/ /* CARTDELAEP7X8 snapshot module format: type | name | version | description -------------------------------------- BYTE | regval | 0.1 | register BYTE | bank | 0.0+ | current bank ARRAY | ROML | 0.0+ | 65536 BYTES of ROML data */ static const char snap_module_name[] = "CARTDELAEP7X8"; #define SNAP_MAJOR 0 #define SNAP_MINOR 1 int delaep7x8_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, regval) < 0) || (SMW_B(m, (uint8_t)currbank) < 0) || (SMW_BA(m, roml_banks, 0x2000 * 8) < 0)) { snapshot_module_close(m); return -1; } return snapshot_module_close(m); } int delaep7x8_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; } /* new in 0.1 */ if (!snapshot_version_is_smaller(vmajor, vminor, 0, 1)) { if (SMR_B(m, ®val) < 0) { goto fail; } } else { regval = 0; } if (0 || (SMR_B_INT(m, &currbank) < 0) || (SMR_BA(m, roml_banks, 0x2000 * 8) < 0)) { goto fail; } snapshot_module_close(m); return delaep7x8_common_attach(); fail: snapshot_module_close(m); return -1; }