/* * rexep256.c - Cartridge handling, REX EP256 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 "c64mem.h" #include "cartio.h" #include "cartridge.h" #include "export.h" #include "monitor.h" #include "rexep256.h" #include "snapshot.h" #include "types.h" #include "util.h" #include "crt.h" /* This eprom system by REX is similair to the EP64. It can handle what the EP64 can handle, plus the following features : - Alternate rom at $8000 - 8kb or 16kb or 32kb eprom support The system uses 9 eproms, of which the first (8kb eprom) is used for the main menu. 8 eprom banks, populated with either an 8kb, 16kb or 32kb eprom, are used for above named features. When a 16kb or 32kb is used only 8kb blocks of it can be switched. Because of the fact that this system supports switching in a different eprom at $8000 (followed by a reset) it is possible to place other 8kb carts in the eproms and use them. The bank selecting is done by writing to $DFA0: bit meaning --- ------- 0 socket selection bit 0 1 socket selection bit 1 2 socket selection bit 2 3 unused 4 8kb bank selection bit 0 5 8kb bank selection bit 1 6-7 unused Reading from $DFC0 switches off the EXROM. Reading from $DFE0 switches on the EXROM. */ /* ---------------------------------------------------------------------*/ static uint16_t rexep256_eprom[8]; static uint8_t rexep256_eprom_roml_bank_offset[8]; static uint8_t regval = 0; /* ---------------------------------------------------------------------*/ static void rexep256_io2_store(uint16_t addr, uint8_t value) { uint8_t eprom_bank, test_value, eprom_part = 0; if ((addr & 0xff) == 0xa0) { regval = value; eprom_bank = (value & 0xf); if (eprom_bank > 7) { return; } test_value = (value & 0xf0) >> 4; if (test_value > 3) { return; } if (rexep256_eprom[eprom_bank] == 0x2000) { eprom_part = 0; } if (rexep256_eprom[eprom_bank] == 0x4000) { eprom_part = test_value & 1; } if (rexep256_eprom[eprom_bank] == 0x8000) { eprom_part = test_value; } cart_romlbank_set_slotmain(rexep256_eprom_roml_bank_offset[eprom_bank] + eprom_part + 1); } } /* I'm unsure whether the register is write-only, but in this case it is assumed to be. */ static uint8_t rexep256_io2_read(uint16_t addr) { if ((addr & 0xff) == 0xc0) { cart_set_port_exrom_slotmain(0); cart_port_config_changed_slotmain(); } if ((addr & 0xff) == 0xe0) { cart_set_port_exrom_slotmain(1); cart_port_config_changed_slotmain(); } return 0; } static uint8_t rexep256_io2_peek(uint16_t addr) { return regval; } static int rexep256_dump(void) { mon_out("Socket: %d, bank: %d\n", regval & 7, (regval & 0x30) >> 4); return 0; } /* ---------------------------------------------------------------------*/ static io_source_t rexep256_device = { CARTRIDGE_NAME_REX_EP256, /* name of the device */ IO_DETACH_CART, /* use cartridge ID to detach the device when involved in a read-collision */ IO_DETACH_NO_RESOURCE, /* does not use a resource for detach */ 0xdf00, 0xdfff, 0xff, /* range for the device, regs:$dfa0/$dfc0/$dfe0 */ 0, /* read is never valid, regs are write only */ rexep256_io2_store, /* store function */ NULL, /* NO poke function */ rexep256_io2_read, /* read function */ rexep256_io2_peek, /* peek function */ rexep256_dump, /* device state information dump function */ CARTRIDGE_REX_EP256, /* 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 *rexep256_list_item = NULL; static const export_resource_t export_res = { CARTRIDGE_NAME_REX_EP256, 0, 1, NULL, &rexep256_device, CARTRIDGE_REX_EP256 }; /* ---------------------------------------------------------------------*/ void rexep256_config_init(void) { cart_config_changed_slotmain(CMODE_8KGAME, CMODE_8KGAME, CMODE_READ); cart_romlbank_set_slotmain(0); } void rexep256_config_setup(uint8_t *rawcart) { memcpy(roml_banks, rawcart, 0x42000); cart_config_changed_slotmain(CMODE_8KGAME, CMODE_8KGAME, CMODE_READ); cart_romlbank_set_slotmain(0); } /* ---------------------------------------------------------------------*/ static int rexep256_common_attach(void) { if (export_add(&export_res) < 0) { return -1; } rexep256_list_item = io_source_register(&rexep256_device); return 0; } /* FIXME: handle the various combinations / possible file lengths */ int rexep256_bin_attach(const char *filename, uint8_t *rawcart) { if (util_file_load(filename, rawcart, 0x2000, UTIL_FILE_LOAD_SKIP_ADDRESS) < 0) { return -1; } return rexep256_common_attach(); } int rexep256_crt_attach(FILE *fd, uint8_t *rawcart) { crt_chip_header_t chip; int rexep256_total_size = 0; int i; memset(rawcart, 0xff, 0x42000); for (i = 0; i < 8; i++) { rexep256_eprom[i] = 0x2000; rexep256_eprom_roml_bank_offset[i] = 0x1f; } 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; } while (1) { if (crt_read_chip_header(&chip, fd)) { break; } if (chip.size != 0x2000 && chip.size != 0x4000 && chip.size != 0x8000) { return -1; } if (chip.bank > 8) { return -1; } rexep256_eprom[chip.bank - 1] = chip.size; rexep256_eprom_roml_bank_offset[chip.bank - 1] = rexep256_total_size >> 13; if (crt_read_chip(rawcart, 0x2000 + rexep256_total_size, &chip, fd)) { return -1; } rexep256_total_size = rexep256_total_size + chip.size; } return rexep256_common_attach(); } void rexep256_detach(void) { export_remove(&export_res); io_source_unregister(rexep256_list_item); rexep256_list_item = NULL; } /* ---------------------------------------------------------------------*/ /* CARTREXEP256 snapshot module format: type | name | version | description -------------------------------------------- BYTE | regval | 0.1 | register ARRAY | EPROM sizes | 0.0+ | 8 WORDS of EPROM sizes in BYTES ARRAY | ROML offsets | 0.0+ | 8 BYTES of EPROM ofsets ARRAY | ROML | 0.0+ | 270336 BYTES of ROML data */ static const char snap_module_name[] = "CARTREXEP256"; #define SNAP_MAJOR 0 #define SNAP_MINOR 1 int rexep256_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_WA(m, rexep256_eprom, 8) < 0 || SMW_BA(m, rexep256_eprom_roml_bank_offset, 8) < 0 || SMW_BA(m, roml_banks, 0x42000) < 0) { snapshot_module_close(m); return -1; } return snapshot_module_close(m); } int rexep256_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_WA(m, rexep256_eprom, 8) < 0 || SMR_BA(m, rexep256_eprom_roml_bank_offset, 8) < 0 || SMR_BA(m, roml_banks, 0x42000) < 0) { goto fail; } snapshot_module_close(m); return rexep256_common_attach(); fail: snapshot_module_close(m); return -1; }