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+// license:BSD-3-Clause
+// copyright-holders:Ryan Holtz
+/*
+ First-gen DEC PDP-8 CPU emulator
+
+ Written by MooglyGuy
+*/
+
+#pragma once
+
+#ifndef __PDP8_H__
+#define __PDP8_H__
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> pdp8_device
+
+// Used by core CPU interface
+class pdp8_device : public cpu_device
+{
+public:
+ // construction/destruction
+ pdp8_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ // device-level overrides
+ virtual void device_start();
+ virtual void device_reset();
+ virtual void device_stop();
+
+ // device_execute_interface overrides
+ virtual UINT32 execute_min_cycles() const;
+ virtual UINT32 execute_max_cycles() const;
+ virtual UINT32 execute_input_lines() const;
+ virtual void execute_run();
+ virtual void execute_set_input(int inputnum, int state);
+
+ // device_memory_interface overrides
+ virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const;
+
+ // device_disasm_interface overrides
+ virtual UINT32 disasm_min_opcode_bytes() const;
+ virtual UINT32 disasm_max_opcode_bytes() const;
+ virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options);
+
+ // device_state_interface overrides
+ virtual void state_string_export(const device_state_entry &entry, std::string &str);
+
+ // address spaces
+ const address_space_config m_program_config;
+
+ enum state
+ {
+ FETCH,
+ DEFER,
+ EXECUTE,
+ WORD_COUNT,
+ CURRENT_ADDR,
+ BREAK
+ }
+
+ enum opcode
+ {
+ AND = 0,
+ TAD,
+ ISZ,
+ DCA,
+ JMS,
+ JMP,
+ IOT,
+ OPR
+ }
+private:
+ // CPU registers
+ UINT16 m_pc;
+ UINT16 m_ac;
+ UINT16 m_mb;
+ UINT16 m_ma;
+ UINT16 m_sr;
+ UINT8 m_l;
+ UINT8 m_ir;
+ bool m_halt;
+
+ // other internal states
+ int m_icount;
+
+ // address spaces
+ address_space *m_program;
+};
+
+// device type definition
+extern const device_type PDP8CPU;
+
+/***************************************************************************
+ REGISTER ENUMERATION
+***************************************************************************/
+
+enum
+{
+ PDP8_PC = 1,
+ PDP8_AC,
+ PDP8_MB,
+ PDP8_MA,
+ PDP8_SR,
+ PDP8_L,
+ PDP8_IR,
+ PDP8_HALT
+};
+
+CPU_DISASSEMBLE( pdp8 );
+
+#endif /* __PDP8_H__ */