/* * multimax.c - Cartridge handling, MultiMAX 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 "c64rom.h" #include "cartio.h" #include "cartridge.h" #include "monitor.h" #include "multimax.h" #include "export.h" #include "resources.h" #include "ram.h" #include "snapshot.h" #include "types.h" #include "util.h" #include "crt.h" #include "vicii-phi1.h" /* MultiMAX 16MB ROM, 64*16K - ROM is mapped to $8000 and $e000 using ultimax mode 2K RAM - RAM is mapped to $0800 One register in the entire I/O1 (or extended RAM for the MAX Machine) space. The register latches the lowbyte of the *address* (not the value written): bit 7 when set, a) the register is disabled and can only be re-enabled by reset and b) the extra RAM is enabled and replaces the register latch. bit 0-5 select ROM bank 0-63 The menu software does this: lda $05 ; bank number tax sta $de80,x sta $0880,x ... so it stores the bank number as a value and address, which indicates that during development it was changed from value to address - which would also explain the inconsistent documentation. */ #define CART_RAM_SIZE (2 * 1024) static uint8_t currbank = 0; static uint8_t reg_enabled = 1; /* this is used on regular C64s */ static void multimax_io1_store(uint16_t addr, uint8_t value) { /*printf("io1 w %04x %02x\n", addr, value);*/ if (reg_enabled) { currbank = addr & 0x3f; reg_enabled = ((addr >> 7) & 1) ^ 1; /*printf("Bank: %02x Register: %s RAM: %s\n", currbank, reg_enabled ? "enabled" : "disabled", reg_enabled ? "disabled" : "enabled");*/ } } static int multimax_dump(void) { mon_out("Register is %s.\n", reg_enabled ? "enabled" : "disabled"); mon_out("Extra RAM is %s.\n", reg_enabled ? "disabled" : "enabled"); mon_out("ROM Bank: %d\n", currbank); return 0; } static io_source_t multimax_device = { CARTRIDGE_NAME_MULTIMAX, /* name of the device */ IO_DETACH_CART, /* use cartridge ID to detach the device when involved in a read-collision */ IO_DETACH_NO_RESOURCE, /* does not use a resource for detach */ 0xde00, 0xdeff, 0xff, /* range for the device, address is ignored, reg:$de00, mirrors:$de01-$deff */ 0, /* read is never valid */ multimax_io1_store, /* store function */ NULL, /* NO poke function */ NULL, /* NO read function */ NULL, /* NO peek function */ multimax_dump, /* device state information dump function */ CARTRIDGE_MULTIMAX, /* 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 *multimax_list_item = NULL; static const export_resource_t export_res = { CARTRIDGE_NAME_MULTIMAX, 1, 1, &multimax_device, NULL, CARTRIDGE_MULTIMAX }; /* ---------------------------------------------------------------------*/ uint8_t multimax_0800_0fff_read(uint16_t addr) { if (reg_enabled == 0) { /*printf("ram r %04x %02x\n", addr, export_ram0[addr & 0x07ff]);*/ return export_ram0[addr & 0x07ff]; } return vicii_read_phi1(); } void multimax_0800_0fff_store(uint16_t addr, uint8_t value) { if (reg_enabled) { /*printf("reg w %04x %02x\n", addr, value);*/ currbank = addr & 0x7f; reg_enabled = ((addr >> 7) & 1) ^ 1; /*printf("Bank: %02x Register: %s RAM: %s\n", currbank, reg_enabled ? "enabled" : "disabled", reg_enabled ? "disabled" : "enabled");*/ } else { /*printf("ram w %04x %02x\n", addr, value);*/ export_ram0[addr & 0x07ff] = value; } } uint8_t multimax_roml_read(uint16_t addr) { return roml_banks[(addr & 0x1fff) + (currbank * 0x2000)]; } uint8_t multimax_romh_read(uint16_t addr) { return romh_banks[(addr & 0x1fff) + (currbank * 0x2000)]; } int multimax_peek_mem(export_t *ex, uint16_t addr, uint8_t *value) { if (addr >= 0xe000) { *value = romh_banks[(addr & 0x1fff) + (currbank * 0x2000)]; return CART_READ_VALID; } else if ((addr >= 0xa000) && (addr <= 0xbfff)) { *value = roml_banks[(addr & 0x1fff) + (currbank * 0x2000)]; return CART_READ_VALID; } else if ((addr >= 0x0800) && (addr <= 0x0fff)) { *value = export_ram0[addr & 0x07ff]; return CART_READ_VALID; } return CART_READ_THROUGH; } void multimax_config_init(void) { currbank = 0; reg_enabled = 1; cart_config_changed_slotmain(CMODE_ULTIMAX, CMODE_ULTIMAX, CMODE_READ); } /* ---------------------------------------------------------------------*/ void multimax_config_setup(uint8_t *rawcart) { int i; for (i = 0; i < 64; i++) { memcpy(&roml_banks[0x0000 + (i * 0x2000)], &rawcart[0x0000 + (i * 0x4000)], 0x2000); memcpy(&romh_banks[0x0000 + (i * 0x2000)], &rawcart[0x2000 + (i * 0x4000)], 0x2000); } cart_config_changed_slotmain(CMODE_ULTIMAX, CMODE_ULTIMAX, CMODE_READ); } /* ---------------------------------------------------------------------*/ /* 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 multimax_powerup(void) { ram_init_with_pattern(export_ram0, CART_RAM_SIZE, &ramparam); } static int multimax_common_attach(void) { if (export_add(&export_res) < 0) { return -1; } multimax_list_item = io_source_register(&multimax_device); return 0; } int multimax_bin_attach(const char *filename, uint8_t *rawcart) { if (util_file_load(filename, rawcart, 1024 * 1024, UTIL_FILE_LOAD_SKIP_ADDRESS) < 0) { return -1; } return multimax_common_attach(); } int multimax_crt_attach(FILE *fd, uint8_t *rawcart) { crt_chip_header_t chip; int i; for (i = 0; i < 64; i++) { if (crt_read_chip_header(&chip, fd)) { return -1; } if (chip.size != 0x4000) { return -1; } if (crt_read_chip(rawcart + (i * 0x4000), 0, &chip, fd)) { return -1; } } return multimax_common_attach(); } void multimax_detach(void) { export_remove(&export_res); } /* ---------------------------------------------------------------------*/ /* CARTMULTIMAX snapshot module format: type | name | description ------------------------------------------------------ BYTE | currbank | current ROM bank BYTE | reg_enabled | flag, is the register enabled? ARRAY | ROML | 512K of ROML data ARRAY | ROMH | 512K of ROMH data ARRAY | RAM | 2048 BYTES of RAM data */ static const char snap_module_name[] = "CARTMULTIMAX"; #define SNAP_MAJOR 0 #define SNAP_MINOR 0 int multimax_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)currbank) < 0) || (SMW_B(m, (uint8_t)reg_enabled) < 0) || (SMW_BA(m, roml_banks, 0x2000 * 64) < 0) || (SMW_BA(m, romh_banks, 0x2000 * 64) < 0) || (SMW_BA(m, export_ram0, 0x0800) < 0)) { snapshot_module_close(m); return -1; } return snapshot_module_close(m); } int multimax_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(m, &currbank) < 0) || (SMR_B(m, ®_enabled) < 0) || (SMR_BA(m, roml_banks, 0x2000 * 64) < 0) || (SMR_BA(m, romh_banks, 0x2000 * 64) < 0) || (SMR_BA(m, export_ram0, 0x0800) < 0)) { goto fail; } snapshot_module_close(m); return multimax_common_attach(); fail: snapshot_module_close(m); return -1; }