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/***************************************************************************
Namco ND-1
machine.c
Functions to emulate general aspects of the machine
(RAM, ROM, interrupts, I/O ports)
***************************************************************************/
#include "driver.h"
#include "cpu/m6809/m6809.h"
#include "namcond1.h"
/* Perform basic machine initialisation */
UINT8 namcond1_h8_irq5_enabled;
UINT8 namcond1_gfxbank;
MACHINE_START( namcond1 )
{
state_save_register_global(namcond1_h8_irq5_enabled);
state_save_register_global(namcond1_gfxbank);
}
MACHINE_RESET( namcond1 )
{
#ifdef MAME_DEBUG
/*UINT8 *ROM = memory_region(REGION_CPU1);*/
/*UINT32 debug_trigger_addr;*/
/*int i;*/
#if 0
// debug trigger patch
// insert a "move.b $B0000000,D2" into the code
debug_trigger_addr = 0x152d4; // after ygv_init
ROM[debug_trigger_addr++] = 0x39;
ROM[debug_trigger_addr++] = 0x14;
ROM[debug_trigger_addr++] = 0xB0;
ROM[debug_trigger_addr++] = 0x00;
ROM[debug_trigger_addr++] = 0x00;
ROM[debug_trigger_addr++] = 0x00;
#endif
#endif
// initialise MCU states
namcond1_h8_irq5_enabled = 0;
// halt the MCU
cpunum_set_input_line(1,INPUT_LINE_RESET,ASSERT_LINE);
}
// instance of the shared ram pointer
UINT16 *namcond1_shared_ram;
READ16_HANDLER( namcond1_shared_ram_r )
{
return namcond1_shared_ram[offset];
}
// $c3ff00-$c3ffff
READ16_HANDLER( namcond1_cuskey_r )
{
switch( offset )
{
// this address returns a jump vector inside ISR2
// - if zero then the ISR returns without jumping
case (0x2e>>1):
return( 0x0000 );
case (0x30>>1):
return( 0x0000 );
default :
logerror( "offset $%X accessed from $%X\n",
offset<<1, activecpu_get_pc() );
return( 0 );
}
}
WRITE16_HANDLER( namcond1_shared_ram_w )
{
switch( offset )
{
default :
COMBINE_DATA( namcond1_shared_ram + offset );
break;
}
}
WRITE16_HANDLER( namcond1_cuskey_w )
{
switch( offset )
{
case (0x0a>>1):
// this is a kludge until we emulate the h8
if ((namcond1_h8_irq5_enabled == 0) && (data != 0x0000))
{
cpunum_set_input_line(1, INPUT_LINE_RESET, CLEAR_LINE);
}
namcond1_h8_irq5_enabled = ( data != 0x0000 );
break;
case (0x0c>>1):
namcond1_gfxbank = (data & 0x0002) >>1; // i think
// should mark tilemaps dirty but i think they already are
break;
default :
break;
}
}
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