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Diffstat (limited to 'src/devices/bus/nes/mmc1_clones.cpp')
-rw-r--r--src/devices/bus/nes/mmc1_clones.cpp79
1 files changed, 76 insertions, 3 deletions
diff --git a/src/devices/bus/nes/mmc1_clones.cpp b/src/devices/bus/nes/mmc1_clones.cpp
index eb5b7d937ab..b0502e5f394 100644
--- a/src/devices/bus/nes/mmc1_clones.cpp
+++ b/src/devices/bus/nes/mmc1_clones.cpp
@@ -28,11 +28,17 @@
// constructor
//-------------------------------------------------
-DEFINE_DEVICE_TYPE(NES_NINJARYU, nes_ninjaryu_device, "nes_ninjaryu", "NES Cart Ninja Ryukenden Chinese PCB")
-DEFINE_DEVICE_TYPE(NES_RESETSXROM, nes_resetsxrom_device, "nes_resetsxrom", "NES Cart BMC RESET-SXROM PCB")
-DEFINE_DEVICE_TYPE(NES_TXC_22110, nes_txc_22110_device, "nes_txc_22110", "NES Cart TXC 01-22110-000 PCB")
+DEFINE_DEVICE_TYPE(NES_BMC_JY820845C, nes_bmc_jy820845c_device, "nes_bmc_jy820845c", "NES Cart BMC JY820845C PCB")
+DEFINE_DEVICE_TYPE(NES_NINJARYU, nes_ninjaryu_device, "nes_ninjaryu", "NES Cart Ninja Ryukenden Chinese PCB")
+DEFINE_DEVICE_TYPE(NES_RESETSXROM, nes_resetsxrom_device, "nes_resetsxrom", "NES Cart BMC RESET-SXROM PCB")
+DEFINE_DEVICE_TYPE(NES_TXC_22110, nes_txc_22110_device, "nes_txc_22110", "NES Cart TXC 01-22110-000 PCB")
+nes_bmc_jy820845c_device::nes_bmc_jy820845c_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : nes_sxrom_device(mconfig, NES_BMC_JY820845C, tag, owner, clock), m_latch0(0), m_mode(0)
+{
+}
+
nes_ninjaryu_device::nes_ninjaryu_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
: nes_sxrom_device(mconfig, NES_NINJARYU, tag, owner, clock)
{
@@ -50,6 +56,22 @@ nes_txc_22110_device::nes_txc_22110_device(const machine_config &mconfig, const
+void nes_bmc_jy820845c_device::device_start()
+{
+ nes_sxrom_device::device_start();
+ save_item(NAME(m_latch0));
+ save_item(NAME(m_mode));
+}
+
+void nes_bmc_jy820845c_device::pcb_reset()
+{
+ nes_sxrom_device::pcb_reset();
+
+ m_latch0 = 0;
+ m_mode = 0;
+ update_banks();
+}
+
void nes_resetsxrom_device::device_start()
{
nes_sxrom_device::device_start();
@@ -117,6 +139,57 @@ void nes_ninjaryu_device::write_h(offs_t offset, u8 data)
/*-------------------------------------------------
+ BMC-JY820845C
+
+ Games: 7 in 1 1993 Chess Series (JY-015)
+
+ MMC1 clone with banking for multigame menu.
+
+ NES 2.0: mapper 550
+
+ In MAME: Supported.
+
+ -------------------------------------------------*/
+
+void nes_bmc_jy820845c_device::update_banks() // used by menu and MHROM games
+{
+ prg32((m_mode & 0x07) << 1 | BIT(m_latch0, 4));
+ chr8((m_mode & 0x06) << 1 | (m_latch0 & 0x03), CHRROM);
+}
+
+void nes_bmc_jy820845c_device::write_m(offs_t offset, u8 data)
+{
+ LOG_MMC(("bmc_jy820845c write_m, offset: %04x, data: %02x\n", offset, data));
+
+ nes_sxrom_device::write_m(offset, data); // register overlaid on WRAM
+
+ if (offset >= 0x1000 && !BIT(m_mode, 3))
+ {
+ m_mode = offset & 0x0f;
+ if ((m_mode & 0x06) == 0x06) // MMC1 mode
+ {
+ set_prg();
+ set_chr();
+ }
+ else
+ update_banks();
+ }
+}
+
+void nes_bmc_jy820845c_device::write_h(offs_t offset, u8 data)
+{
+ LOG_MMC(("bmc_jy820845c write_h, offset: %04x, data: %02x\n", offset, data));
+
+ m_latch0 = data;
+
+ if ((m_mode & 0x06) == 0x06)
+ nes_sxrom_device::write_h(offset, data);
+ else
+ update_banks();
+}
+
+/*-------------------------------------------------
+
BMC-RESET-SXROM
Games: 4 in 1 (JY-021, JY-022, JY-051)