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diff --git a/src/devices/cpu/sigma2/sigma2d.h b/src/devices/cpu/sigma2/sigma2d.h
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+// license:BSD-3-Clause
+// copyright-holders:AJR
+
+#ifndef MAME_CPU_SIGMA2_SIGMA2D_H
+#define MAME_CPU_SIGMA2_SIGMA2D_H
+
+#pragma once
+
+class sigma2_disassembler : public util::disasm_interface
+{
+public:
+ // construction/destruction
+ sigma2_disassembler();
+
+protected:
+ sigma2_disassembler(const char *const *reg_names);
+
+ // util::disasm_interface overrides
+ virtual u32 opcode_alignment() const override;
+ virtual offs_t disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer &params) override;
+
+ // disassembly helpers
+ offs_t dasm_memory_reference(std::ostream &stream, offs_t pc, const data_buffer &opcodes, u16 inst) const;
+ virtual offs_t dasm_read_direct(std::ostream &stream, offs_t pc, const data_buffer &opcodes, u16 inst) const;
+
+ const char *const *const m_reg_names;
+};
+
+class xerox530_disassembler : public sigma2_disassembler
+{
+public:
+ // construction/destruction
+ xerox530_disassembler();
+
+protected:
+ // sigma2_disassembler overrides
+ virtual offs_t dasm_read_direct(std::ostream &stream, offs_t pc, const data_buffer &opcodes, u16 inst) const override;
+};
+
+#endif // MAME_CPU_SIGMA2_SIGMA2D_H