summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/cpu/m6502/rp2a03.h
diff options
context:
space:
mode:
Diffstat (limited to 'src/devices/cpu/m6502/rp2a03.h')
-rw-r--r--src/devices/cpu/m6502/rp2a03.h91
1 files changed, 91 insertions, 0 deletions
diff --git a/src/devices/cpu/m6502/rp2a03.h b/src/devices/cpu/m6502/rp2a03.h
new file mode 100644
index 00000000000..4112bbbe152
--- /dev/null
+++ b/src/devices/cpu/m6502/rp2a03.h
@@ -0,0 +1,91 @@
+// license:BSD-3-Clause
+// copyright-holders:Olivier Galibert
+/***************************************************************************
+
+ rp2a03.h
+
+ 6502, NES variant
+
+***************************************************************************/
+#ifndef MAME_CPU_M6502_RP2A03_H
+#define MAME_CPU_M6502_RP2A03_H
+
+#pragma once
+
+#include "m6502.h"
+#include "sound/nes_apu.h"
+
+class rp2a03_core_device : public m6502_device {
+public:
+ rp2a03_core_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+ virtual std::unique_ptr<util::disasm_interface> create_disassembler() override;
+
+ virtual void do_exec_full() override;
+ virtual void do_exec_partial() override;
+
+protected:
+ rp2a03_core_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
+
+#define O(o) void o ## _full(); void o ## _partial()
+
+ // rp2a03 opcodes - same as 6502 with D disabled
+ O(adc_nd_aba); O(adc_nd_abx); O(adc_nd_aby); O(adc_nd_idx); O(adc_nd_idy); O(adc_nd_imm); O(adc_nd_zpg); O(adc_nd_zpx);
+ O(arr_nd_imm);
+ O(isb_nd_aba); O(isb_nd_abx); O(isb_nd_aby); O(isb_nd_idx); O(isb_nd_idy); O(isb_nd_zpg); O(isb_nd_zpx);
+ O(rra_nd_aba); O(rra_nd_abx); O(rra_nd_aby); O(rra_nd_idx); O(rra_nd_idy); O(rra_nd_zpg); O(rra_nd_zpx);
+ O(sbc_nd_aba); O(sbc_nd_abx); O(sbc_nd_aby); O(sbc_nd_idx); O(sbc_nd_idy); O(sbc_nd_imm); O(sbc_nd_zpg); O(sbc_nd_zpx);
+
+#undef O
+
+private:
+};
+
+class rp2a03_device : public rp2a03_core_device, public device_mixer_interface {
+public:
+ rp2a03_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+ void rp2a03_map(address_map &map) ATTR_COLD;
+
+protected:
+ rp2a03_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
+
+ required_device<nesapu_device> m_apu;
+
+ virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
+
+ void apu_irq(int state);
+ uint8_t apu_read_mem(offs_t offset);
+};
+
+class rp2a03g_device : public rp2a03_device
+{
+public:
+ rp2a03g_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
+};
+
+/* These are the official XTAL values and clock rates used by Nintendo for
+ manufacturing throughout the production of the 2A03. PALC_APU_CLOCK is
+ the clock rate devised by UMC(?) for PAL Famicom clone hardware. */
+
+#define RP2A03_NTSC_XTAL XTAL(21'477'272)
+#define RP2A03_PAL_XTAL XTAL(26'601'712)
+#define NTSC_APU_CLOCK (RP2A03_NTSC_XTAL/12) /* 1.7897726666... MHz */
+#define PAL_APU_CLOCK (RP2A03_PAL_XTAL/16) /* 1.662607 MHz */
+#define PALC_APU_CLOCK (RP2A03_PAL_XTAL/15) /* 1.77344746666... MHz */
+
+enum {
+ RP2A03_IRQ_LINE = m6502_device::IRQ_LINE,
+ RP2A03_APU_IRQ_LINE = m6502_device::APU_IRQ_LINE,
+ RP2A03_NMI_LINE = m6502_device::NMI_LINE,
+ RP2A03_SET_OVERFLOW = m6502_device::V_LINE
+};
+
+DECLARE_DEVICE_TYPE(RP2A03_CORE, rp2a03_core_device)
+DECLARE_DEVICE_TYPE(RP2A03, rp2a03_device)
+DECLARE_DEVICE_TYPE(RP2A03G, rp2a03g_device)
+
+#endif // MAME_CPU_M6502_RP2A03_H