Mercurial > repos > blastem
view jcart.c @ 1863:d60f2d7c02a5
Differentiate between the full Sega mapper and the SRAM only one. Fixes crash on save state load for Phantasy Star IV and other games that use the same mapper
author | Michael Pavone <pavone@retrodev.com> |
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date | Tue, 14 May 2019 23:20:35 -0700 |
parents | 395f684c5379 |
children |
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#include <stdlib.h> #include "genesis.h" static io_port *get_ports(m68k_context *m68k) { genesis_context *gen = m68k->system; if (!gen->extra) { io_port *ports = calloc(2, sizeof(io_port)); ports[0].device_type = IO_GAMEPAD3; ports[0].device.pad.gamepad_num = 3; ports[1].device_type = IO_GAMEPAD3; ports[1].device.pad.gamepad_num = 4; io_control_write(ports, 0x40, 0); io_control_write(ports + 1, 0x40, 0); gen->extra = ports; } return gen->extra; } void *jcart_write_w(uint32_t address, void *context, uint16_t value) { m68k_context *m68k= context; io_port *ports = get_ports(m68k); value = value << 6 & 0x40; io_data_write(ports, value, m68k->current_cycle); io_data_write(ports + 1, value, m68k->current_cycle); return context; } void *jcart_write_b(uint32_t address, void *context, uint8_t value) { if (address & 1) { return jcart_write_w(address, context, value); } return context; } uint16_t jcart_read_w(uint32_t address, void *context) { m68k_context *m68k= context; io_port *ports = get_ports(m68k); //according to Eke, bit 14 is forced low, at least on the Micro Machines 2 cart //TODO: Test behavior of actual cart uint16_t value = io_data_read(ports, m68k->current_cycle) << 8; value |= io_data_read(ports + 1, m68k->current_cycle); return value; } uint8_t jcart_read_b(uint32_t address, void *context) { m68k_context *m68k= context; io_port *ports = get_ports(m68k); return io_data_read(ports + (address & 1), m68k->current_cycle); } void jcart_adjust_cycles(genesis_context *context, uint32_t deduction) { io_port *ports = get_ports(context->m68k); io_adjust_cycles(ports, context->m68k->current_cycle, deduction); io_adjust_cycles(ports + 1, context->m68k->current_cycle, deduction); } void jcart_gamepad_down(genesis_context *context, uint8_t gamepad_num, uint8_t button) { io_port *ports = get_ports(context->m68k); if (gamepad_num == ports[1].device.pad.gamepad_num) { ports++; } else if (gamepad_num != ports[0].device.pad.gamepad_num) { ports = NULL; } if (ports) { io_port_gamepad_down(ports, button); } } void jcart_gamepad_up(genesis_context *context, uint8_t gamepad_num, uint8_t button) { io_port *ports = get_ports(context->m68k); if (gamepad_num == ports[1].device.pad.gamepad_num) { ports++; } else if (gamepad_num != ports[0].device.pad.gamepad_num) { ports = NULL; } if (ports) { io_port_gamepad_up(ports, button); } }