/* * comal80.c -- Comal 80 (C128) cartridge emulation * * 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 #include #include "cartridge.h" #include "cartio.h" #include "util.h" #include "c64cart.h" #include "export.h" #include "c128cart.h" #include "functionrom.h" #include "crt.h" #include "comal80.h" /* #define DBGCOMAL80 */ #ifdef DBGCOMAL80 #define DBG(x) printf x #else #define DBG(x) #endif /* The C128 Comal80 cartridge size is 96 KB (6 banks x 16KB) and it's using bankswitching, so that only 16 KB is visible at a time in the C128 memory map at address $C000 to $FFFF (Remark, it is using same address area as EDITOR and KERNAL). By write too and read from address $DE00 or call comal system routine, you can control which comal80 module routines you can call in our own machinecodeprogram. */ #define COMAL80_ROM_SIZE (0x4000 * 6) static int comal80_register = 0; /* ---------------------------------------------------------------------*/ /* some prototypes are needed */ static uint8_t c128comal80_io1_peek(uint16_t addr); static uint8_t c128comal80_io1_read(uint16_t addr); static void c128comal80_io1_store(uint16_t addr, uint8_t value); static uint8_t c128comal80_io2_read(uint16_t addr); static uint8_t c128comal80_io2_peek(uint16_t addr); static void c128comal80_io2_store(uint16_t addr, uint8_t value); static int c128comal80_dump(void); static io_source_t c128comal80_io1_device = { CARTRIDGE_C128_NAME_COMAL80, /* name of the device */ IO_DETACH_CART, /* use cartridge ID to detach the device when involved in a read-collision */ IO_DETACH_NO_RESOURCE, /* does not use a resource for detach */ 0xde00, 0xdeff, 0xff, /* range for the device, address is ignored by the write functions, reg:$de00, mirrors:$de01-$deff */ 1, /* read is never valid */ c128comal80_io1_store, /* store function */ NULL, /* NO poke function */ c128comal80_io1_read, /* read function */ c128comal80_io1_peek, /* peek function */ c128comal80_dump, /* device state information dump function */ CARTRIDGE_C128_MAKEID(CARTRIDGE_C128_COMAL80), /* 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_t c128comal80_io2_device = { CARTRIDGE_C128_NAME_COMAL80, /* 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, address is ignored by the read/write functions, reg:$df00, mirrors:$df01-$dfff */ 1, /* validity of the read is determined by the cartridge at read time */ c128comal80_io2_store, /* store function */ NULL, /* NO poke function */ c128comal80_io2_read, /* read function */ c128comal80_io2_peek, /* peek function */ c128comal80_dump, /* device state information dump function */ CARTRIDGE_C128_MAKEID(CARTRIDGE_C128_COMAL80), /* 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 *c128comal80_io1_list_item = NULL; static io_source_list_t *c128comal80_io2_list_item = NULL; static const export_resource_t export_res = { CARTRIDGE_C128_NAME_COMAL80, 1, 1, &c128comal80_io1_device, &c128comal80_io2_device, CARTRIDGE_C128_MAKEID(CARTRIDGE_C128_COMAL80) }; /* ---------------------------------------------------------------------*/ static void c128comal80_io1_store(uint16_t addr, uint8_t value) { /* B (D6) A (D5) 0 0 y0 U1 ROM 0 1 y1 unused 1 0 y2 U2 ROM 1 1 y3 U3 ROM */ int romoffset[4] = { 0, /* 0, */ 0, /* 0, */ 2, /* 0x8000, */ 4, /* 0x10000 */ }; int bank; comal80_register = value & 0xf0; /* upper 4 bit go into the register latch */ bank = romoffset[(value >> 5) & 3]; bank |= ((value >> 4) & 1); external_function_rom_set_bank(bank); DBG(("c128comal80_io1_store value:%02x bank: %d\n", value, bank)); } static uint8_t c128comal80_io1_read(uint16_t addr) { uint8_t value = comal80_register; /* value = ext_function_rom[0x1e00 + (addr & 0xff)]; */ value |= ((value >> 4) & 1) << 4; DBG(("c128comal80_io1_read %04x %02x\n", addr, value)); return value; } static uint8_t c128comal80_io1_peek(uint16_t addr) { return ext_function_rom[0x1e00 + (addr & 0xff)]; } static uint8_t c128comal80_io2_read(uint16_t addr) { uint8_t value; value = ext_function_rom[0x1f00 + (addr & 0xff)]; DBG(("c128comal80_io2_read %04x %02x\n", addr, value)); return value; } static uint8_t c128comal80_io2_peek(uint16_t addr) { return ext_function_rom[0x1f00 + (addr & 0xff)]; } static void c128comal80_io2_store(uint16_t addr, uint8_t value) { DBG(("c128comal80_io2_store %04x %02x\n", addr, value)); } static int c128comal80_dump(void) { return 0; } /* ---------------------------------------------------------------------*/ void c128comal80_config_setup(uint8_t *rawcart) { DBG(("c128comal80_config_setup\n")); /* copy loaded cartridge data into actually used ROM array */ memcpy(&ext_function_rom[0x4000 + (0x8000 * 0)], rawcart + (0x4000 * 0), 0x4000); memcpy(&ext_function_rom[0x4000 + (0x8000 * 1)], rawcart + (0x4000 * 1), 0x4000); memcpy(&ext_function_rom[0x4000 + (0x8000 * 2)], rawcart + (0x4000 * 2), 0x4000); memcpy(&ext_function_rom[0x4000 + (0x8000 * 3)], rawcart + (0x4000 * 3), 0x4000); memcpy(&ext_function_rom[0x4000 + (0x8000 * 4)], rawcart + (0x4000 * 4), 0x4000); memcpy(&ext_function_rom[0x4000 + (0x8000 * 5)], rawcart + (0x4000 * 5), 0x4000); } static int c128comal80_common_attach(void) { /* setup i/o device */ if (export_add(&export_res) < 0) { return -1; } c128comal80_io1_list_item = io_source_register(&c128comal80_io1_device); c128comal80_io2_list_item = io_source_register(&c128comal80_io2_device); /* FIXME */ c128comal80_io1_store(0, 0); return 0; } int c128comal80_bin_attach(const char *filename, uint8_t *rawcart) { DBG(("c128comal80_bin_attach '%s'\n", filename)); if (util_file_load(filename, rawcart, COMAL80_ROM_SIZE, UTIL_FILE_LOAD_SKIP_ADDRESS) == 0) { return c128comal80_common_attach(); } return -1; } /* returns -1 on error, else a positive CRT ID */ int c128comal80_crt_attach(FILE *fd, uint8_t *rawcart) { crt_chip_header_t chip; int n; DBG(("c128comal80_crt_attach ptr:%p\n", (void*)rawcart)); for (n = 0; n < 6; n++) { if (crt_read_chip_header(&chip, fd)) { return -1; } DBG(("chip %d at %02x len %02x offs %04x \n", n, chip.start, chip.size, (unsigned)(n * 0x4000))); if (chip.start == 0xc000 && chip.size == 0x4000) { if (crt_read_chip(rawcart + (n * 0x4000), 0, &chip, fd)) { return -1; } } else { return -1; } } return c128comal80_common_attach(); } void c128comal80_detach(void) { if (c128comal80_io1_list_item) { io_source_unregister(c128comal80_io1_list_item); c128comal80_io1_list_item = NULL; } if (c128comal80_io2_list_item) { io_source_unregister(c128comal80_io2_list_item); c128comal80_io2_list_item = NULL; } export_remove(&export_res); } void c128comal80_reset(void) { DBG(("c128comal80_reset\n")); external_function_rom_set_bank(0); } /* ---------------------------------------------------------------------*/ /* COMAL80C128 snapshot module format: FIXME */ static char snap_module_name[] = "COMAL80C128"; #define SNAP_MAJOR 0 #define SNAP_MINOR 1 int c128comal80_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)comal80_register) < 0) || (SMW_BA(m, &ext_function_rom[0x4000], (0x8000 * 5) + 0x4000) < 0)) { snapshot_module_close(m); return -1; } return snapshot_module_close(m); } int c128comal80_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, &comal80_register) < 0) || (SMR_BA(m, &ext_function_rom[0x4000], (0x8000 * 5) + 0x4000) < 0)) { goto fail; } snapshot_module_close(m); return c128comal80_common_attach(); fail: snapshot_module_close(m); return -1; }