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// license:BSD-3-Clause
// copyright-holders:Mark McDougall, R. Belmont
/***************************************************************************
Namco ND-1
machine.c
Functions to emulate general aspects of the machine
(RAM, ROM, interrupts, I/O ports)
***************************************************************************/
#include "emu.h"
#include "cpu/m6809/m6809.h"
#include "includes/namcond1.h"
/* Perform basic machine initialisation */
void namcond1_state::machine_start()
{
save_item(NAME(m_h8_irq5_enabled));
// save_item(NAME(m_p8)); //isn't read anywhere for the time being
}
void namcond1_state::machine_reset()
{
#ifdef MAME_DEBUG
/*uint8_t *ROM = memregion(REGION_CPU1)->base();*/
/*uint32_t 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
m_h8_irq5_enabled = 0;
// halt the MCU
m_mcu->set_input_line(INPUT_LINE_RESET, ASSERT_LINE);
}
// $c3ff00-$c3ffff
READ16_MEMBER(namcond1_state::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("%s offset $%X accessed\n",
machine().describe_context(), offset << 1);
return( 0 );
}
}
WRITE16_MEMBER(namcond1_state::cuskey_w)
{
switch( offset )
{
case (0x0a>>1):
// this is a kludge until we emulate the h8
if ((m_h8_irq5_enabled == 0) && (data != 0x0000))
{
m_mcu->set_input_line(INPUT_LINE_RESET, CLEAR_LINE);
}
m_h8_irq5_enabled = ( data != 0x0000 );
break;
case (0x0c>>1):
m_ygv608->set_gfxbank(data & 0x0003);
// bit 0 used in abcheck during garbage screens, tile/color select of some kind?
break;
default :
break;
}
}
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