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// license:BSD-3-Clause
// copyright-holders:Juergen Buchmueller, hap
#ifndef __I8085_H__
#define __I8085_H__
/***************************************************************************
CONSTANTS
***************************************************************************/
enum
{
I8085_PC, I8085_SP, I8085_AF, I8085_BC, I8085_DE, I8085_HL,
I8085_A, I8085_B, I8085_C, I8085_D, I8085_E, I8085_F, I8085_H, I8085_L,
I8085_STATUS, I8085_SOD, I8085_SID, I8085_INTE,
I8085_HALT, I8085_IM
};
#define I8085_INTR_LINE 0
#define I8085_RST55_LINE 1
#define I8085_RST65_LINE 2
#define I8085_RST75_LINE 3
#define I8085_STATUS_INTA 0x01
#define I8085_STATUS_WO 0x02
#define I8085_STATUS_STACK 0x04
#define I8085_STATUS_HLTA 0x08
#define I8085_STATUS_OUT 0x10
#define I8085_STATUS_M1 0x20
#define I8085_STATUS_INP 0x40
#define I8085_STATUS_MEMR 0x80
/* STATUS changed callback */
#define MCFG_I8085A_STATUS(_devcb) \
i8085a_cpu_device::set_out_status_func(*device, DEVCB_##_devcb);
/* INTE changed callback */
#define MCFG_I8085A_INTE(_devcb) \
i8085a_cpu_device::set_out_inte_func(*device, DEVCB_##_devcb);
/* SID changed callback (8085A only) */
#define MCFG_I8085A_SID(_devcb) \
i8085a_cpu_device::set_in_sid_func(*device, DEVCB_##_devcb);
/* SOD changed callback (8085A only) */
#define MCFG_I8085A_SOD(_devcb) \
i8085a_cpu_device::set_out_sod_func(*device, DEVCB_##_devcb);
class i8085a_cpu_device : public cpu_device
{
public:
// construction/destruction
i8085a_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
i8085a_cpu_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, uint32_t clock, const char *shortname, const char *source, int cputype);
// static configuration helpers
template<class _Object> static devcb_base &set_out_status_func(device_t &device, _Object object) { return downcast<i8085a_cpu_device &>(device).m_out_status_func.set_callback(object); }
template<class _Object> static devcb_base &set_out_inte_func(device_t &device, _Object object) { return downcast<i8085a_cpu_device &>(device).m_out_inte_func.set_callback(object); }
template<class _Object> static devcb_base &set_in_sid_func(device_t &device, _Object object) { return downcast<i8085a_cpu_device &>(device).m_in_sid_func.set_callback(object); }
template<class _Object> static devcb_base &set_out_sod_func(device_t &device, _Object object) { return downcast<i8085a_cpu_device &>(device).m_out_sod_func.set_callback(object); }
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
// device_execute_interface overrides
virtual uint32_t execute_min_cycles() const override { return 4; }
virtual uint32_t execute_max_cycles() const override { return 16; }
virtual uint32_t execute_input_lines() const override { return 4; }
virtual uint32_t execute_default_irq_vector() const override { return 0xff; }
virtual void execute_run() override;
virtual void execute_set_input(int inputnum, int state) override;
virtual uint64_t execute_clocks_to_cycles(uint64_t clocks) const override { return (clocks + 2 - 1) / 2; }
virtual uint64_t execute_cycles_to_clocks(uint64_t cycles) const override { return (cycles * 2); }
// device_memory_interface overrides
virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override { return (spacenum == AS_PROGRAM) ? &m_program_config : ( (spacenum == AS_IO) ? &m_io_config : nullptr ); }
// device_state_interface overrides
virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
virtual void state_export(const device_state_entry &entry) override;
virtual void state_import(const device_state_entry &entry) override;
// device_disasm_interface overrides
virtual uint32_t disasm_min_opcode_bytes() const override { return 1; }
virtual uint32_t disasm_max_opcode_bytes() const override { return 3; }
virtual offs_t disasm_disassemble(std::ostream &stream, offs_t pc, const uint8_t *oprom, const uint8_t *opram, uint32_t options) override;
private:
address_space_config m_program_config;
address_space_config m_io_config;
devcb_write8 m_out_status_func;
devcb_write_line m_out_inte_func;
devcb_read_line m_in_sid_func;
devcb_write_line m_out_sod_func;
int m_cputype; /* 0 8080, 1 8085A */
PAIR m_PC,m_SP,m_AF,m_BC,m_DE,m_HL,m_WZ;
uint8_t m_HALT;
uint8_t m_IM; /* interrupt mask (8085A only) */
uint8_t m_STATUS; /* status word */
uint8_t m_after_ei; /* post-EI processing; starts at 2, check for ints at 0 */
uint8_t m_nmi_state; /* raw NMI line state */
uint8_t m_irq_state[4]; /* raw IRQ line states */
uint8_t m_trap_pending; /* TRAP interrupt latched? */
uint8_t m_trap_im_copy; /* copy of IM register when TRAP was taken */
uint8_t m_sod_state; /* state of the SOD line */
bool m_ietemp; /* import/export temp space */
address_space *m_program;
direct_read_data *m_direct;
address_space *m_io;
int m_icount;
/* cycles lookup */
static const uint8_t lut_cycles_8080[256];
static const uint8_t lut_cycles_8085[256];
uint8_t lut_cycles[256];
/* flags lookup */
uint8_t ZS[256];
uint8_t ZSP[256];
void set_sod(int state);
void set_inte(int state);
void set_status(uint8_t status);
uint8_t get_rim_value();
void break_halt_for_interrupt();
uint8_t ROP();
uint8_t ARG();
uint16_t ARG16();
uint8_t RM(uint32_t a);
void WM(uint32_t a, uint8_t v);
void check_for_interrupts();
void execute_one(int opcode);
void init_tables();
};
class i8080_cpu_device : public i8085a_cpu_device
{
public:
// construction/destruction
i8080_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
protected:
virtual uint32_t execute_input_lines() const override { return 1; }
virtual uint64_t execute_clocks_to_cycles(uint64_t clocks) const override { return clocks; }
virtual uint64_t execute_cycles_to_clocks(uint64_t cycles) const override { return cycles; }
};
class i8080a_cpu_device : public i8085a_cpu_device
{
public:
// construction/destruction
i8080a_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
protected:
virtual uint32_t execute_input_lines() const override { return 1; }
virtual uint64_t execute_clocks_to_cycles(uint64_t clocks) const override { return clocks; }
virtual uint64_t execute_cycles_to_clocks(uint64_t cycles) const override { return cycles; }
};
extern const device_type I8080;
extern const device_type I8080A;
extern const device_type I8085A;
#endif
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