#include "driver.h"
#include "cpu/z80/z80.h"
/* coin inputs are inverted in storming */
int lsasquad_invertcoin;
/***************************************************************************
main <-> sound CPU communication
***************************************************************************/
static int sound_nmi_enable,pending_nmi,sound_cmd,sound_result;
int lsasquad_sound_pending;
static TIMER_CALLBACK( nmi_callback )
{
if (sound_nmi_enable) cpunum_set_input_line(1,INPUT_LINE_NMI,PULSE_LINE);
else pending_nmi = 1;
}
WRITE8_HANDLER( lsasquad_sh_nmi_disable_w )
{
sound_nmi_enable = 0;
}
WRITE8_HANDLER( lsasquad_sh_nmi_enable_w )
{
sound_nmi_enable = 1;
if (pending_nmi)
{
cpunum_set_input_line(1,INPUT_LINE_NMI,PULSE_LINE);
pending_nmi = 0;
}
}
WRITE8_HANDLER( lsasquad_sound_command_w )
{
lsasquad_sound_pending |= 0x01;
sound_cmd = data;
//logerror("%04x: sound cmd %02x\n",activecpu_get_pc(),data);
timer_call_after_resynch(data,nmi_callback);
}
READ8_HANDLER( lsasquad_sh_sound_command_r )
{
lsasquad_sound_pending &= ~0x01;
//logerror("%04x: read sound cmd %02x\n",activecpu_get_pc(),sound_cmd);
return sound_cmd;
}
WRITE8_HANDLER( lsasquad_sh_result_w )
{
lsasquad_sound_pending |= 0x02;
//logerror("%04x: sound res %02x\n",activecpu_get_pc(),data);
sound_result = data;
}
READ8_HANDLER( lsasquad_sound_result_r )
{
lsasquad_sound_pending &= ~0x02;
//logerror("%04x: read sound res %02x\n",activecpu_get_pc(),sound_result);
return sound_result;
}
READ8_HANDLER( lsasquad_sound_status_r )
{
/* bit 0: message pending for sound cpu */
/* bit 1: message pending for main cpu */
return lsasquad_sound_pending;
}
READ8_HANDLER( daikaiju_sh_sound_command_r )
{
lsasquad_sound_pending &= ~0x01;
lsasquad_sound_pending |= 0x02;
//logerror("%04x: read sound cmd %02x\n",activecpu_get_pc(),sound_cmd);
return sound_cmd;
}
READ8_HANDLER( daikaiju_sound_status_r )
{
/* bit 0: message pending for sound cpu */
/* bit 1: message pending for main cpu */
return lsasquad_sound_pending^3;
}
/***************************************************************************
LSA Squad 68705 protection interface
The following is ENTIRELY GUESSWORK!!!
***************************************************************************/
static UINT8 from_main,from_mcu;
static int mcu_sent = 0,main_sent = 0;
static UINT8 portA_in,portA_out,ddrA;
READ8_HANDLER( lsasquad_68705_portA_r )
{
//logerror("%04x: 68705 port A read %02x\n",activecpu_get_pc(),portA_in);
return (portA_out & ddrA) | (portA_in & ~ddrA);
}
WRITE8_HANDLER( lsasquad_68705_portA_w )
{
//logerror("%04x: 68705 port A write %02x\n",activecpu_get_pc(),data);
portA_out = data;
}
WRITE8_HANDLER( lsasquad_68705_ddrA_w )
{
ddrA = data;
}
/*
* Port B connections:
*
* all bits are logical 1 when read (+5V pullup)
*
* 1 W when 1->0, enables latch which brings the command from main CPU (read from port A)
* 2 W when 0->1, copies port A to the latch for the main CPU
*/
static UINT8 portB_in,portB_out,ddrB;
READ8_HANDLER( lsasquad_68705_portB_r )
{
return (portB_out & ddrB) | (portB_in & ~ddrB);
}
WRITE8_HANDLER( lsasquad_68705_portB_w )
{
//logerror("%04x: 68705 port B write %02x\n",activecpu_get_pc(),data);
if ((ddrB & 0x02) && (~data & 0x02) && (portB_out & 0x02))
{
portA_in = from_main;
if (main_sent) cpunum_set_input_line(2,0,CLEAR_LINE);
main_sent = 0;
//logerror("read command %02x from main cpu\n",portA_in);
}
if ((ddrB & 0x04) && (data & 0x04) && (~portB_out & 0x04))
{
//logerror("send command %02x to main cpu\n",portA_out);
from_mcu = portA_out;
mcu_sent = 1;
}
portB_out = data;
}
WRITE8_HANDLER( lsasquad_68705_ddrB_w )
{
ddrB = data;
}
WRITE8_HANDLER( lsasquad_mcu_w )
{
//logerror("%04x: mcu_w %02x\n",activecpu_get_pc(),data);
from_main = data;
main_sent = 1;
cpunum_set_input_line(2,0,ASSERT_LINE);
}
READ8_HANDLER( lsasquad_mcu_r )
{
//logerror("%04x: mcu_r %02x\n",activecpu_get_pc(),from_mcu);
mcu_sent = 0;
return from_mcu;
}
READ8_HANDLER( lsasquad_mcu_status_r )
{
int res = input_port_3_r(0);
/* bit 0 = when 1, mcu is ready to receive data from main cpu */
/* bit 1 = when 0, mcu has sent data to the main cpu */
//logerror("%04x: mcu_status_r\n",activecpu_get_pc());
if (!main_sent) res |= 0x01;
if (!mcu_sent) res |= 0x02;
return res ^ lsasquad_invertcoin;
}