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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/***************************************************************************
Premier Microsystems Sprites
***************************************************************************/
#include "emu.h"
#include "dragon_sprites.h"
#include "screen.h"
ROM_START(dragon_sprites)
ROM_REGION(0x2000, "eprom", 0)
ROM_LOAD("sprites.rom", 0x0000, 0x2000, CRC(b8f54eaf) SHA1(f1288653a12ba9a17ef721d0f4867160c3ca341f))
ROM_END
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
DEFINE_DEVICE_TYPE(DRAGON_SPRITES, dragon_sprites_device, "dragon_sprites", "Dragon Sprites")
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// dragon_sprites_device - constructor
//-------------------------------------------------
dragon_sprites_device::dragon_sprites_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock)
: device_t(mconfig, DRAGON_SPRITES, tag, owner, clock)
, device_cococart_interface(mconfig, *this )
, m_eprom(*this, "eprom")
, m_vdp(*this, "tms9929a")
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void dragon_sprites_device::device_start()
{
}
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void dragon_sprites_device::device_add_mconfig(machine_config &config)
{
/* video hardware */
TMS9929A(config, m_vdp, 10.738635_MHz_XTAL); // TODO: verify crystal, manual says 10.7MHz
m_vdp->set_screen("screen");
m_vdp->set_vram_size(0x4000);
m_vdp->int_callback().set(FUNC(dragon_sprites_device::nmi_w));
SCREEN(config, "screen", SCREEN_TYPE_RASTER);
}
//-------------------------------------------------
// rom_region - device-specific ROM region
//-------------------------------------------------
const tiny_rom_entry *dragon_sprites_device::device_rom_region() const
{
return ROM_NAME( dragon_sprites );
}
//-------------------------------------------------
// cts_read
//-------------------------------------------------
u8 dragon_sprites_device::cts_read(offs_t offset)
{
u8 data = 0x00;
switch (offset)
{
case 0x2000:
data = m_vdp->vram_read();
break;
case 0x2001:
data = m_vdp->register_read();
break;
default:
data = m_eprom->base()[offset & 0x1fff];
break;
}
return data;
}
//-------------------------------------------------
// cts_write
//-------------------------------------------------
void dragon_sprites_device::cts_write(offs_t offset, u8 data)
{
switch (offset)
{
case 0x2000:
m_vdp->vram_write(data);
break;
case 0x2001:
m_vdp->register_write(data);
break;
};
}
WRITE_LINE_MEMBER(dragon_sprites_device::nmi_w)
{
// set the NMI line
set_line_value(line::NMI, state);
}
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