/* * speedy.h - Speedy Freezer Cartridge * * 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. * */ /* Speedy Freezer Cartridge - 8KiB mapped to c1lo, mirrored twice so it fills the 16k - "Freeze" button, which will cause the following: - the circuit "waits" for a (TED-) interrupt to occur - now A9 is pulled low, which will cause the IRQ vector being fetched from offset 0x1dfe/0x1dff in the ROM - this results in the address 0xFD10 - Code at 0xFD10 jumps to 0xFDF4, where it pages itself into c1l memory */ /* #define DEBUG_SPEEDY */ #include "vice.h" #include #include #include "archdep.h" #include "cartridge.h" #include "cartio.h" #include "crt.h" #include "export.h" #include "log.h" #include "lib.h" #include "interrupt.h" #include "maincpu.h" #include "monitor.h" #include "plus4cart.h" #include "plus4mem.h" #include "snapshot.h" #include "util.h" #include "speedy.h" #ifdef DEBUG_SPEEDY #define DBG(x) log_printf x #else #define DBG(x) #endif #define SPEEDYROMSIZE 0x2000 static int freeze_active = 0; static int freeze_active_q = 0; static int speedy_filetype = 0; static unsigned char *speedyrom = NULL; static const export_resource_t export_res = { CARTRIDGE_PLUS4_NAME_SPEEDY, 0, PLUS4_CART_C1LO, NULL, NULL, CARTRIDGE_PLUS4_SPEEDY }; /* ------------------------------------------------------------------------- */ /* read 0x8000...0xbfff */ uint8_t speedy_c1lo_read(uint16_t addr) { unsigned int offset = (addr & 0x1fff); /* DBG(("speedy_c1lo_read (freeze:%d) addr:%04x offs:%04x value: %02x", freeze_active, addr, offset, speedyrom[offset])); */ if (freeze_active_q) { DBG(("speedy_c1lo_read disabling freeze at addr:%04x", addr)); freeze_active_q = 0; } return speedyrom[offset]; } int speedy_fd00_read(uint16_t addr, uint8_t *value) { unsigned int offset; if (freeze_active_q) { offset = (addr & 0x1fff); offset &= ~0x0200; *value = speedyrom[offset]; DBG(("speedy_fd00_read addr: 0x%04x offs: 0x%04x value:0x%02x", addr, offset, *value)); return CART_READ_VALID; } return CART_READ_THROUGH; } int speedy_fe00_read(uint16_t addr, uint8_t *value) { unsigned int offset; if (freeze_active_q) { offset = (addr & 0x1fff); offset &= ~0x0200; *value = speedyrom[offset]; DBG(("speedy_fe00_read addr: 0x%04x offs: 0x%04x value:0x%02x", addr, offset, *value)); return CART_READ_VALID; } return CART_READ_THROUGH; } /* read 0xc000...0xffff (kernal) */ int speedy_kernal_read(uint16_t addr, uint8_t *value) { unsigned int offset; if (freeze_active) { if ((addr == 0xfffe) || (addr == 0xffff)) { DBG(("speedy_kernal_read set Q (addr: 0x%04x)", addr)); freeze_active_q = 1; freeze_active = 0; /* release button */ } } if (freeze_active_q) { offset = (addr & 0x1fff); offset &= ~0x0200; *value = speedyrom[offset]; DBG(("speedy_kernal_read addr: 0x%04x offs: 0x%04x value:0x%02x", addr, offset, *value)); return CART_READ_VALID; } return CART_READ_THROUGH; } /* segment: bit 0-1: 2 upper bits of address bit 2: ROM select (0: RAM, 1: ROM) */ uint8_t *speedy_get_tedmem_base(unsigned int segment) { return speedyrom; } void speedy_reset(void) { DBG(("speedy_reset")); freeze_active_q = 0; freeze_active = 0; } void speedy_freeze(void) { DBG(("speedy_freeze")); /* the flipflop will clock in the state of the irq line */ freeze_active_q = 0; freeze_active = 1; } void speedy_config_setup(uint8_t *rawcart) { DBG(("speedy_config_setup")); memcpy(speedyrom, rawcart, SPEEDYROMSIZE); } static int speedy_common_attach(void) { DBG(("speedy_common_attach")); if(!(speedyrom = lib_malloc(SPEEDYROMSIZE))) { return -1; } if (export_add(&export_res) < 0) { return -1; } return 0; } int speedy_bin_attach(const char *filename, uint8_t *rawcart) { speedy_filetype = 0; DBG(("speedy_bin_attach '%s'", filename)); /* we accept 8KiB images */ if (util_file_load(filename, rawcart, SPEEDYROMSIZE, UTIL_FILE_LOAD_SKIP_ADDRESS) < 0) { return -1; } speedy_filetype = CARTRIDGE_FILETYPE_BIN; return speedy_common_attach(); } int speedy_crt_attach(FILE *fd, uint8_t *rawcart) { crt_chip_header_t chip; DBG(("speedy_crt_attach")); if (crt_read_chip_header(&chip, fd)) { return -1; } if ((chip.bank >= 1) || (chip.size != 0x2000)) { return -1; } /* DBG(("bank: %d offset: %06x \n", chip.bank, chip.bank << 14)); */ if (crt_read_chip(rawcart, 0, &chip, fd)) { return -1; } speedy_filetype = CARTRIDGE_FILETYPE_CRT; return speedy_common_attach(); } void speedy_detach(void) { DBG(("speedy_detach")); export_remove(&export_res); lib_free(speedyrom); speedyrom = NULL; } /* ---------------------------------------------------------------------*/ /* CARTSPEEDY snapshot module format: type | name | version | description ------------------------------------------------- BYTE | freeze_active | 0.1+ | was freeze pressed? BYTE | freeze_active_q | 0.1+ | was freeze activated? ARRAY | ROM | 0.1+ | 8KiB of ROM data */ /* FIXME: since we cant actually make snapshots due to TED bugs, the following is completely untested */ static const char snap_module_name[] = "CARTSPEEDY"; #define SNAP_MAJOR 0 #define SNAP_MINOR 1 int speedy_snapshot_write_module(snapshot_t *s) { snapshot_module_t *m; DBG(("speedy_snapshot_write_module")); m = snapshot_module_create(s, snap_module_name, SNAP_MAJOR, SNAP_MINOR); if (m == NULL) { return -1; } if (0 || SMW_B(m, (uint8_t)freeze_active) < 0 || SMW_B(m, (uint8_t)freeze_active_q) < 0 || SMW_BA(m, speedyrom, SPEEDYROMSIZE) < 0) { snapshot_module_close(m); return -1; } snapshot_module_close(m); return 0; } int speedy_snapshot_read_module(snapshot_t *s) { uint8_t vmajor, vminor; snapshot_module_t *m; DBG(("speedy_snapshot_read_module")); 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, &freeze_active) < 0 || SMR_B_INT(m, &freeze_active_q) < 0 || SMR_BA(m, speedyrom, SPEEDYROMSIZE) < 0) { goto fail; } snapshot_module_close(m); speedy_common_attach(); /* set filetype to none */ speedy_filetype = 0; return 0; fail: snapshot_module_close(m); return -1; }