/*************************************************************************** SAM Coupe Driver - Written By Lee Hammerton, Dirk Best ***************************************************************************/ #include "emu.h" #include "includes/samcoupe.h" #include "machine/msm6242.h" #include "machine/ram.h" /*************************************************************************** CONSTANTS ***************************************************************************/ #define LMPR_RAM0 0x20 /* If bit set ram is paged into bank 0, else its rom0 */ #define LMPR_ROM1 0x40 /* If bit set rom1 is paged into bank 3, else its ram */ #define HMPR_MCNTRL 0x80 /* If set external RAM is enabled */ /*************************************************************************** MEMORY BANKING ***************************************************************************/ static void samcoupe_update_bank(address_space &space, int bank_num, UINT8 *memory, int is_readonly) { char bank[10]; sprintf(bank,"bank%d",bank_num); samcoupe_state *state = space.machine().driver_data(); if (memory) { state->membank(bank)->set_base(memory); space.install_read_bank (((bank_num-1) * 0x4000), ((bank_num-1) * 0x4000) + 0x3FFF, bank); if (is_readonly) { space.unmap_write(((bank_num-1) * 0x4000), ((bank_num-1) * 0x4000) + 0x3FFF); } else { space.install_write_bank(((bank_num-1) * 0x4000), ((bank_num-1) * 0x4000) + 0x3FFF, bank); } } else { space.nop_readwrite(((bank_num-1) * 0x4000), ((bank_num-1) * 0x4000) + 0x3FFF); } } static void samcoupe_install_ext_mem(address_space &space) { samcoupe_state *state = space.machine().driver_data(); UINT8 *mem; /* bank 3 */ if (state->m_lext >> 6 < space.machine().device(RAM_TAG)->size() >> 20) mem = &space.machine().device(RAM_TAG)->pointer()[(space.machine().device(RAM_TAG)->size() & 0xfffff) + (state->m_lext >> 6) * 0x100000 + (state->m_lext & 0x3f) * 0x4000]; else mem = NULL; samcoupe_update_bank(space, 3, mem, FALSE); /* bank 4 */ if (state->m_hext >> 6 < space.machine().device(RAM_TAG)->size() >> 20) mem = &space.machine().device(RAM_TAG)->pointer()[(space.machine().device(RAM_TAG)->size() & 0xfffff) + (state->m_hext >> 6) * 0x100000 + (state->m_hext & 0x3f) * 0x4000]; else mem = NULL; samcoupe_update_bank(space, 4, mem, FALSE); } void samcoupe_update_memory(address_space &space) { samcoupe_state *state = space.machine().driver_data(); const int PAGE_MASK = ((space.machine().device(RAM_TAG)->size() & 0xfffff) / 0x4000) - 1; UINT8 *rom = state->memregion("maincpu")->base(); UINT8 *memory; int is_readonly; /* BANK1 */ if (state->m_lmpr & LMPR_RAM0) /* Is ram paged in at bank 1 */ { if ((state->m_lmpr & 0x1F) <= PAGE_MASK) memory = &space.machine().device(RAM_TAG)->pointer()[(state->m_lmpr & PAGE_MASK) * 0x4000]; else memory = NULL; /* Attempt to page in non existant ram region */ is_readonly = FALSE; } else { memory = rom; /* Rom0 paged in */ is_readonly = TRUE; } samcoupe_update_bank(space, 1, memory, is_readonly); /* BANK2 */ if (((state->m_lmpr + 1) & 0x1f) <= PAGE_MASK) memory = &space.machine().device(RAM_TAG)->pointer()[((state->m_lmpr + 1) & PAGE_MASK) * 0x4000]; else memory = NULL; /* Attempt to page in non existant ram region */ samcoupe_update_bank(space, 2, memory, FALSE); /* only update bank 3 and 4 when external memory is not enabled */ if (state->m_hmpr & HMPR_MCNTRL) { samcoupe_install_ext_mem(space); } else { /* BANK3 */ if ((state->m_hmpr & 0x1F) <= PAGE_MASK ) memory = &space.machine().device(RAM_TAG)->pointer()[(state->m_hmpr & PAGE_MASK)*0x4000]; else memory = NULL; /* Attempt to page in non existant ram region */ samcoupe_update_bank(space, 3, memory, FALSE); /* BANK4 */ if (state->m_lmpr & LMPR_ROM1) /* Is Rom1 paged in at bank 4 */ { memory = rom + 0x4000; is_readonly = TRUE; } else { if (((state->m_hmpr + 1) & 0x1f) <= PAGE_MASK) memory = &space.machine().device(RAM_TAG)->pointer()[((state->m_hmpr + 1) & PAGE_MASK) * 0x4000]; else memory = NULL; /* Attempt to page in non existant ram region */ is_readonly = FALSE; } samcoupe_update_bank(space, 4, memory, FALSE); } /* video memory location */ if (state->m_vmpr & 0x40) /* if bit set in 2 bank screen mode */ state->m_videoram = &space.machine().device(RAM_TAG)->pointer()[((state->m_vmpr & 0x1e) & PAGE_MASK) * 0x4000]; else state->m_videoram = &space.machine().device(RAM_TAG)->pointer()[((state->m_vmpr & 0x1f) & PAGE_MASK) * 0x4000]; } WRITE8_MEMBER(samcoupe_state::samcoupe_ext_mem_w) { address_space &space_program = machine().device("maincpu")->memory().space(AS_PROGRAM); if (offset & 1) m_hext = data; else m_lext = data; /* external RAM enabled? */ if (m_hmpr & HMPR_MCNTRL) { samcoupe_install_ext_mem(space_program); } } /*************************************************************************** REAL TIME CLOCK ***************************************************************************/ static READ8_DEVICE_HANDLER( samcoupe_rtc_r ) { address_space &spaceio = space.machine().device("maincpu")->memory().space(AS_IO); msm6242_device *rtc = dynamic_cast(device); return rtc->read(spaceio,offset >> 12); } static WRITE8_DEVICE_HANDLER( samcoupe_rtc_w ) { address_space &spaceio = space.machine().device("maincpu")->memory().space(AS_IO); msm6242_device *rtc = dynamic_cast(device); rtc->write(spaceio,offset >> 12, data); } /*************************************************************************** MOUSE ***************************************************************************/ static TIMER_CALLBACK( samcoupe_mouse_reset ) { samcoupe_state *state = machine.driver_data(); state->m_mouse_index = 0; } UINT8 samcoupe_mouse_r(running_machine &machine) { samcoupe_state *state = machine.driver_data(); UINT8 result; /* on a read, reset the timer */ state->m_mouse_reset->adjust(attotime::from_usec(50)); /* update when we are about to read the first real values */ if (state->m_mouse_index == 2) { /* update values */ int mouse_x = machine.root_device().ioport("mouse_x")->read(); int mouse_y = machine.root_device().ioport("mouse_y")->read(); int mouse_dx = state->m_mouse_x - mouse_x; int mouse_dy = state->m_mouse_y - mouse_y; state->m_mouse_x = mouse_x; state->m_mouse_y = mouse_y; /* button state */ state->m_mouse_data[2] = machine.root_device().ioport("mouse_buttons")->read(); /* y-axis */ state->m_mouse_data[3] = (mouse_dy & 0xf00) >> 8; state->m_mouse_data[4] = (mouse_dy & 0x0f0) >> 4; state->m_mouse_data[5] = (mouse_dy & 0x00f) >> 0; /* x-axis */ state->m_mouse_data[6] = (mouse_dx & 0xf00) >> 8; state->m_mouse_data[7] = (mouse_dx & 0x0f0) >> 4; state->m_mouse_data[8] = (mouse_dx & 0x00f) >> 0; } /* get current value */ result = state->m_mouse_data[state->m_mouse_index++]; /* reset if we are at the end */ if (state->m_mouse_index == sizeof(state->m_mouse_data)) state->m_mouse_index = 1; return result; } void samcoupe_state::machine_start() { m_mouse_reset = machine().scheduler().timer_alloc(FUNC(samcoupe_mouse_reset)); /* schedule our video updates */ m_video_update_timer = machine().scheduler().timer_alloc(FUNC(sam_video_update_callback)); m_video_update_timer->adjust(machine().primary_screen->time_until_pos(0, 0)); } /*************************************************************************** RESET ***************************************************************************/ void samcoupe_state::machine_reset() { address_space &space = machine().device("maincpu")->memory().space(AS_PROGRAM); address_space &spaceio = machine().device("maincpu")->memory().space(AS_IO); /* initialize state */ m_lmpr = 0x0f; /* ROM0 paged in, ROM1 paged out RAM Banks */ m_hmpr = 0x01; m_vmpr = 0x81; m_line_int = 0xff; /* line interrupts disabled */ m_status = 0x1f; /* no interrupts active */ /* initialize mouse */ m_mouse_index = 0; m_mouse_data[0] = 0xff; m_mouse_data[1] = 0xff; if (machine().root_device().ioport("config")->read() & 0x01) { /* install RTC */ device_t *rtc = machine().device("sambus_clock"); spaceio.install_legacy_readwrite_handler(*rtc, 0xef, 0xef, 0xffff, 0xff00, FUNC(samcoupe_rtc_r), FUNC(samcoupe_rtc_w)); } else { /* no RTC support */ spaceio.unmap_readwrite(0xef, 0xef, 0xffff, 0xff00); } /* initialize memory */ samcoupe_update_memory(space); }