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// license:BSD-3-Clause
// copyright-holders:Fabio Priuli
/***********************************************************************************************************
NES/Famicom cartridge emulation for RacerMate PCBs
Here we emulate the UNL-RACERMATE PCB [mapper 168]
TODO:
- save VRAM
- emulate the bike controller?
***********************************************************************************************************/
#include "emu.h"
#include "racermate.h"
#ifdef NES_PCB_DEBUG
#define VERBOSE 1
#else
#define VERBOSE 0
#endif
#define LOG_MMC(x) do { if (VERBOSE) logerror x; } while (0)
//-------------------------------------------------
// constructor
//-------------------------------------------------
DEFINE_DEVICE_TYPE(NES_RACERMATE, nes_racermate_device, "nes_racermate", "NES Cart Racermate PCB")
nes_racermate_device::nes_racermate_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock)
: nes_nrom_device(mconfig, NES_RACERMATE, tag, owner, clock)
, m_latch(0)
{
}
void nes_racermate_device::device_start()
{
common_start();
save_item(NAME(m_latch));
}
void nes_racermate_device::pcb_reset()
{
prg16_89ab(0);
prg16_cdef(m_prg_chunks - 1);
chr4_0(0, CHRRAM);
chr4_4(0, CHRRAM);
m_latch = 0;
}
/*-------------------------------------------------
mapper specific handlers
-------------------------------------------------*/
/*-------------------------------------------------
Board UNL-RACERMATE
In MESS: *VERY* preliminary support. Also, it seems that this
board saves to battery the CHRRAM!!!
-------------------------------------------------*/
void nes_racermate_device::update_banks()
{
chr4_4(m_latch & 0x0f, m_chr_source);
prg16_89ab(m_latch >> 6);
}
void nes_racermate_device::write_h(offs_t offset, uint8_t data)
{
LOG_MMC(("racermate write_h, offset: %04x, data: %02x\n", offset, data));
if (offset == 0x3000)
{
m_latch = data;
update_banks();
}
}
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