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// license:BSD-3-Clause
// copyright-holders:Kaz
/***********************************************************************************************************
NES/Famicom cartridge emulation for Zemina PCBs
***********************************************************************************************************/
#include "emu.h"
#include "zemina.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
//-------------------------------------------------
const device_type NES_ZEMINA = &device_creator<nes_zemina_device>;
nes_zemina_device::nes_zemina_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: nes_nrom_device(mconfig, NES_ZEMINA, "NES Cart Zemina PCB", tag, owner, clock, "nes_zemina", __FILE__)
{
}
void nes_zemina_device::device_start()
{
common_start();
}
void nes_zemina_device::pcb_reset()
{
set_nt_mirroring(PPU_MIRROR_VERT);
chr2_0(0, CHRROM);
chr2_2(0, CHRROM);
chr2_4(0, CHRROM);
chr2_6(0, CHRROM);
prg16_89ab(0);
prg16_cdef(0);
}
/*-------------------------------------------------
mapper specific handlers
-------------------------------------------------*/
/*-------------------------------------------------
Zemina board emulation
Currently, this board is only known to be used
by one game: Magic Kid Googoo.
Info from kevtris at NESDev, who dumped the game:
https://wiki.nesdev.com/w/index.php/INES_Mapper_190
-------------------------------------------------*/
WRITE8_MEMBER(nes_zemina_device::write_h)
{
LOG_MMC(("zemina write_h, offset: %04x, data: %02x\n", offset, data));
if (offset >= 0x0000 && offset <= 0x1FFF)
{
prg16_89ab(data & 0x07);
}
else if (offset >= 0x4000 && offset <= 0x5FFF)
{
prg16_89ab((data & 0x07) | 0x08);
}
else if ((offset & 0x2000) == 0x2000) // 2K CHR banks
{
switch (offset & 0x03) // only A0, A1, A13, A14, and A15 are used to select the CHR bank
{
case 0x00: chr2_0(data, CHRROM); break;
case 0x01: chr2_2(data, CHRROM); break;
case 0x02: chr2_4(data, CHRROM); break;
case 0x03: chr2_6(data, CHRROM); break;
}
}
}
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