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https://github.com/holub/mame
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bus/nes: Simplified VRC4 clone board T-230. (#8735)
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0kmg
GitHub
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commit
e3bd9bf1ee
@ -43,7 +43,6 @@ DEFINE_DEVICE_TYPE(NES_DAOU306, nes_daou306_device, "nes_daou306", "
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DEFINE_DEVICE_TYPE(NES_CC21, nes_cc21_device, "nes_cc21", "NES Cart CC-21 PCB")
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DEFINE_DEVICE_TYPE(NES_XIAOZY, nes_xiaozy_device, "nes_xiaozy", "NES Cart Xiao Zhuan Yuan PCB")
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DEFINE_DEVICE_TYPE(NES_EDU2K, nes_edu2k_device, "nes_edu2k", "NES Cart Educational Computer 2000 PCB")
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DEFINE_DEVICE_TYPE(NES_T230, nes_t230_device, "nes_t230", "NES Cart T-230 PCB")
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DEFINE_DEVICE_TYPE(NES_MK2, nes_mk2_device, "nes_mk2", "NES Cart Mortal Kombat 2 PCB")
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DEFINE_DEVICE_TYPE(NES_43272, nes_43272_device, "nes_43272", "NES Cart UNL-43272 PCB")
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DEFINE_DEVICE_TYPE(NES_EH8813A, nes_eh8813a_device, "nes_eh8813a", "NES Cart UNL-EH8813A PCB")
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@ -94,11 +93,6 @@ nes_edu2k_device::nes_edu2k_device(const machine_config &mconfig, const char *ta
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{
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}
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nes_t230_device::nes_t230_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
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: nes_nrom_device(mconfig, NES_T230, tag, owner, clock), m_irq_count(0), m_irq_count_latch(0), m_irq_mode(0), m_irq_enable(0), m_irq_enable_latch(0)
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{
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}
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nes_mk2_device::nes_mk2_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
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: nes_nrom_device(mconfig, NES_MK2, tag, owner, clock), m_irq_count(0), m_irq_count_latch(0), m_irq_clear(0), m_irq_enable(0)
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{
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@ -238,31 +232,6 @@ void nes_edu2k_device::pcb_reset()
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m_latch = 0;
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}
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void nes_t230_device::device_start()
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{
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common_start();
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save_item(NAME(m_irq_mode));
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save_item(NAME(m_irq_enable));
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save_item(NAME(m_irq_enable_latch));
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save_item(NAME(m_irq_count));
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save_item(NAME(m_irq_count_latch));
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save_item(NAME(m_mmc_vrom_bank));
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}
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void nes_t230_device::pcb_reset()
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{
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m_chr_source = m_vrom_chunks ? CHRROM : CHRRAM;
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prg16_89ab(0);
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prg16_cdef(m_prg_chunks - 1);
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chr8(0, m_chr_source);
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m_irq_mode = 0;
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m_irq_enable = m_irq_enable_latch = 0;
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m_irq_count = m_irq_count_latch = 0;
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memset(m_mmc_vrom_bank, 0, sizeof(m_mmc_vrom_bank));
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}
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void nes_mk2_device::device_start()
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{
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common_start();
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@ -676,80 +645,6 @@ uint8_t nes_edu2k_device::read_m(offs_t offset)
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return m_prgram[((m_latch * 0x2000) + offset) & (m_prgram.size() - 1)];
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}
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/*-------------------------------------------------
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Board UNL-T-230
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Games: Dragon Ball Z IV (Unl)
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This mapper appears to be similar to Konami VRC-2
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but the game has no VROM and only 1 VRAM bank, so we
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completely skip the chr bankswitch. If other games
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using the same board and using CHR should surface,
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we need to investigate this...
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In MESS: Supported
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-------------------------------------------------*/
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// Identical to Konami IRQ
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void nes_t230_device::hblank_irq(int scanline, int vblank, int blanked)
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{
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/* Increment & check the IRQ scanline counter */
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if (m_irq_enable && (++m_irq_count == 0x100))
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{
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m_irq_count = m_irq_count_latch;
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m_irq_enable = m_irq_enable_latch;
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hold_irq_line();
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}
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}
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void nes_t230_device::write_h(offs_t offset, uint8_t data)
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{
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LOG_MMC(("t230 write_h, offset: %04x, data: %02x\n", offset, data));
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switch (offset & 0x700c)
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{
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case 0x0000:
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break;
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case 0x2000:
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prg16_89ab(data);
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break;
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case 0x1000:
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case 0x1004:
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case 0x1008:
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case 0x100c:
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switch (data & 0x03)
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{
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case 0x00: set_nt_mirroring(PPU_MIRROR_VERT); break;
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case 0x01: set_nt_mirroring(PPU_MIRROR_HORZ); break;
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case 0x02: set_nt_mirroring(PPU_MIRROR_LOW); break;
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case 0x03: set_nt_mirroring(PPU_MIRROR_HIGH); break;
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}
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break;
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case 0x7000:
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m_irq_count_latch &= ~0x0f;
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m_irq_count_latch |= data & 0x0f;
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break;
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case 0x7004:
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m_irq_count_latch &= ~0xf0;
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m_irq_count_latch |= (data << 4) & 0xf0;
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break;
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case 0x7008:
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m_irq_mode = data & 0x04; // currently not implemented: 0 = prescaler mode / 1 = CPU mode
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m_irq_enable = data & 0x02;
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m_irq_enable_latch = data & 0x01;
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if (data & 0x02)
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m_irq_count = m_irq_count_latch;
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break;
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default:
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logerror("unl_t230_w uncaught offset: %04x value: %02x\n", offset, data);
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break;
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}
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}
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/*-------------------------------------------------
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Bootleg Board for MK2
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@ -185,32 +185,6 @@ private:
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};
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// ======================> nes_t230_device
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class nes_t230_device : public nes_nrom_device
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{
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public:
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// construction/destruction
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nes_t230_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
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virtual void write_h(offs_t offset, uint8_t data) override;
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virtual void hblank_irq(int scanline, int vblank, int blanked) override;
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virtual void pcb_reset() override;
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protected:
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// device-level overrides
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virtual void device_start() override;
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private:
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uint16_t m_irq_count, m_irq_count_latch;
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uint8_t m_irq_mode;
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int m_irq_enable, m_irq_enable_latch;
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uint8_t m_mmc_vrom_bank[8];
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};
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// ======================> nes_mk2_device
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class nes_mk2_device : public nes_nrom_device
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@ -316,7 +290,6 @@ DECLARE_DEVICE_TYPE(NES_DAOU306, nes_daou306_device)
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DECLARE_DEVICE_TYPE(NES_CC21, nes_cc21_device)
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DECLARE_DEVICE_TYPE(NES_XIAOZY, nes_xiaozy_device)
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DECLARE_DEVICE_TYPE(NES_EDU2K, nes_edu2k_device)
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DECLARE_DEVICE_TYPE(NES_T230, nes_t230_device)
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DECLARE_DEVICE_TYPE(NES_MK2, nes_mk2_device)
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DECLARE_DEVICE_TYPE(NES_43272, nes_43272_device)
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DECLARE_DEVICE_TYPE(NES_EH8813A, nes_eh8813a_device)
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@ -35,6 +35,7 @@ DEFINE_DEVICE_TYPE(NES_AX5705, nes_ax5705_device, "nes_ax5705", "
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DEFINE_DEVICE_TYPE(NES_BMC_830506C, nes_bmc_830506c_device, "nes_bmc_830506c", "NES Cart BMC 830506C PCB")
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DEFINE_DEVICE_TYPE(NES_CITYFIGHT, nes_cityfight_device, "nes_cityfight", "NES Cart City Fighter PCB")
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DEFINE_DEVICE_TYPE(NES_SHUIGUAN, nes_shuiguan_device, "nes_shuiguan", "NES Cart Shui Guan Pipe Pirate PCB")
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DEFINE_DEVICE_TYPE(NES_T230, nes_t230_device, "nes_t230", "NES Cart T-230 PCB")
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DEFINE_DEVICE_TYPE(NES_TF1201, nes_tf1201_device, "nes_tf1201", "NES Cart UNL-TF1201 PCB")
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DEFINE_DEVICE_TYPE(NES_TH21311, nes_th21311_device, "nes_th21311", "NES Cart UNL-TH2131-1 PCB")
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@ -74,6 +75,11 @@ nes_shuiguan_device::nes_shuiguan_device(const machine_config &mconfig, const ch
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{
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}
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nes_t230_device::nes_t230_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
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: nes_konami_vrc4_device(mconfig, NES_T230, tag, owner, clock)
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{
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}
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nes_tf1201_device::nes_tf1201_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
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: nes_konami_vrc4_device(mconfig, NES_TF1201, tag, owner, clock)
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{
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@ -182,6 +188,15 @@ void nes_shuiguan_device::pcb_reset()
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m_reg = 0;
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}
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void nes_t230_device::device_start()
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{
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nes_konami_vrc4_device::device_start();
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// VRC4 pins 3 and 4
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m_vrc_ls_prg_a = 3; // A3
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m_vrc_ls_prg_b = 2; // A2
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}
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void nes_tf1201_device::device_start()
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{
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nes_konami_vrc4_device::device_start();
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@ -419,6 +434,43 @@ void nes_shuiguan_device::write_h(offs_t offset, u8 data)
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}
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}
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/*-------------------------------------------------
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Board UNL-T-230
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Games: Dragon Ball Z IV (Unl)
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VRC4 clone that uses CHRRAM instead of CHRROM and
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has nonstandard PRG banking.
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NES 2.0: mapper 529
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In MAME: Supported.
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TODO: This cart and its appearance on the 2yudb set
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have IRQ timing issues that cause a bouncing status
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bar in fights. Other emulators also have issues
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on the split line so perhaps some noise is expected?
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-------------------------------------------------*/
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void nes_t230_device::write_h(offs_t offset, u8 data)
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{
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LOG_MMC(("t230 write_h, offset: %04x, data: %02x\n", offset, data));
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switch (offset & 0x7000)
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{
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case 0x0000:
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break; // PRG banking at $8000 ignored
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case 0x2000:
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prg16_89ab(data);
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break;
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default:
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nes_konami_vrc4_device::write_h(offset, data);
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break;
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}
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}
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/*-------------------------------------------------
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UNL-TF1201
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@ -152,6 +152,22 @@ private:
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};
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// ======================> nes_t230_device
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class nes_t230_device : public nes_konami_vrc4_device
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{
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public:
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// construction/destruction
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nes_t230_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
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virtual void write_h(offs_t offset, u8 data) override;
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protected:
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// device-level overrides
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virtual void device_start() override;
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};
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// ======================> nes_tf1201_device
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class nes_tf1201_device : public nes_konami_vrc4_device
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@ -203,6 +219,7 @@ DECLARE_DEVICE_TYPE(NES_AX5705, nes_ax5705_device)
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DECLARE_DEVICE_TYPE(NES_BMC_830506C, nes_bmc_830506c_device)
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DECLARE_DEVICE_TYPE(NES_CITYFIGHT, nes_cityfight_device)
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DECLARE_DEVICE_TYPE(NES_SHUIGUAN, nes_shuiguan_device)
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DECLARE_DEVICE_TYPE(NES_T230, nes_t230_device)
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DECLARE_DEVICE_TYPE(NES_TF1201, nes_tf1201_device)
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DECLARE_DEVICE_TYPE(NES_TH21311, nes_th21311_device)
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