/* * delaep64.c - Cartridge handling, Dela EP64 cart. * * Written by * Michael Klein * * 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 "delaep64.h" #include "export.h" #include "monitor.h" #include "snapshot.h" #include "types.h" #include "util.h" #include "vicii-phi1.h" #include "crt.h" /* * for cart schematics, see http://a98.shuttle.de/~michael/dela-ep64/ */ /* This is an eprom cartridge. It has 1 2764 (8Kb) which holds the base eprom with the base menu, and 2 27256 eproms of which 8Kb parts are banked into the $8000-9FFF area. The bank selecting is done by writing to $DE00. The following bits are used for bank decoding in $DE00: bit meaning --- ------- 0 eprom selection bit 2 1 eprom selection bit 3 2 unused 3 unused 4 eprom selection bit 0 5 eprom selection bit 1 6 unused 7 EXROM control (1=EXROM off, 0=EXROM on) The following eprom select values result in the following bank selection: value bank ----- ---- 0 0 (base) 1 0 (base) 2 0 (base) 3 0 (base) 4 1 5 2 6 3 7 4 8 5 9 6 10 7 11 8 12 0 (base) 13 0 (base) 14 0 (base) 15 0 (base) */ /* ---------------------------------------------------------------------*/ static int currbank = 0; static uint8_t regval = 0; static void delaep64_io1(uint8_t value, unsigned int mode) { uint8_t bank, config; regval = value; /* D7 -> EXROM */ config = (value & 0x80) ? 2 : 0; cart_config_changed_slotmain(config, config, mode); /* * bank 0: 2764 (left socket) * bank 4-7: 1st 27256 (middle socket) * bank 7-11: 2nd 27256 (right socket) */ bank = ((value & 0x30) >> 4) + ((value & 0x03) << 2); if (bank < 4 || bank > 11) { bank = 0; } else { bank = bank - 3; /* turning the banks into 0-8 */ } cart_romlbank_set_slotmain(bank); currbank = bank; } static uint8_t delaep64_io1_read(uint16_t addr) { uint8_t value = vicii_read_phi1(); delaep64_io1(value, CMODE_READ); return 0; } static uint8_t delaep64_io1_peek(uint16_t addr) { return regval; } static void delaep64_io1_store(uint16_t addr, uint8_t value) { delaep64_io1(value, CMODE_WRITE); } static int delaep64_dump(void) { mon_out("Currently selected EPROM bank: %d, cart status: %s\n", currbank, (regval & 0x80) ? "Disabled" : "Enabled"); return 0; } /* ---------------------------------------------------------------------*/ static io_source_t delaep64_device = { CARTRIDGE_NAME_DELA_EP64, /* name of the device */ IO_DETACH_CART, /* use cartridge ID to detach the device when involved in a read-collision */ IO_DETACH_NO_RESOURCE, /* does not use a resource for detach */ 0xde00, 0xdeff, 0xff, /* range for the device, address is ignored, reg:$de00, mirrors:$de01-$deff */ 0, /* read is never valid */ delaep64_io1_store, /* store function */ NULL, /* NO poke function */ delaep64_io1_read, /* read function */ delaep64_io1_peek, /* peek function */ delaep64_dump, /* device state information dump function */ CARTRIDGE_DELA_EP64, /* 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 *delaep64_list_item = NULL; static const export_resource_t export_res = { CARTRIDGE_NAME_DELA_EP64, 0, 1, &delaep64_device, NULL, CARTRIDGE_DELA_EP64 }; /* ---------------------------------------------------------------------*/ void delaep64_config_init(void) { delaep64_io1(0, CMODE_READ); } void delaep64_config_setup(uint8_t *rawcart) { memcpy(roml_banks, rawcart, 0x2000 * 9); delaep64_io1(0, CMODE_READ); } /* ---------------------------------------------------------------------*/ static int delaep64_common_attach(void) { if (export_add(&export_res) < 0) { return -1; } delaep64_list_item = io_source_register(&delaep64_device); return 0; } int delaep64_bin_attach(const char *filename, uint8_t *rawcart) { int size = 0x12000; memset(rawcart, 0xff, 0x12000); while (size != 0) { if (util_file_load(filename, rawcart, size, UTIL_FILE_LOAD_SKIP_ADDRESS) < 0) { size -= 0x2000; } else { return delaep64_common_attach(); } } return -1; } int delaep64_crt_attach(FILE *fd, uint8_t *rawcart) { int rom_size = -1; crt_chip_header_t chip; /* * 0x00000-0x01fff: 2764 * 0x02000-0x09fff: 1st 27256 * 0x0a000-0x11fff: 2nd 27256 */ memset(rawcart, 0xff, 0x12000); if (crt_read_chip_header(&chip, fd)) { return -1; } /* First handle the base image */ 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; } /* check for the size of the following rom images, they can be of either 0x2000 or 0x8000 */ if (chip.size != 0x2000 && chip.size != 0x8000) { return -1; } /* make sure all rom images are of the same size */ if (rom_size < 0) { rom_size = chip.size; } if (chip.size != rom_size) { return -1; } /* maximum of 2 32kb or 8 8kb images allowed */ if ((rom_size == 0x8000 && chip.bank > 2) || (rom_size == 0x2000 && chip.bank > 8)) { return -1; } /* put the images in the right place */ if (crt_read_chip(rawcart, 0x2000 + ((chip.bank - 1) * rom_size), &chip, fd)) { return -1; } } return delaep64_common_attach(); } void delaep64_detach(void) { export_remove(&export_res); io_source_unregister(delaep64_list_item); delaep64_list_item = NULL; } /* ---------------------------------------------------------------------*/ /* CARTDELAEP64 snapshot module format: type | name | version | description -------------------------------------- BYTE | regval | 0.1 | register BYTE | bank | 0.0+ | current bank ARRAY | ROML | 0.0+ | 73728 BYTES of ROML data */ static const char snap_module_name[] = "CARTDELAEP64"; #define SNAP_MAJOR 0 #define SNAP_MINOR 1 int delaep64_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 * 9) < 0)) { snapshot_module_close(m); return -1; } return snapshot_module_close(m); } int delaep64_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 * 9) < 0)) { goto fail; } snapshot_module_close(m); return delaep64_common_attach(); fail: snapshot_module_close(m); return -1; }