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diff --git a/src/mame/sega/s32comm.h b/src/mame/sega/s32comm.h
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+// license:BSD-3-Clause
+// copyright-holders:Ariane Fugmann
+#ifndef MAME_SEGA_S32COMM_H
+#define MAME_SEGA_S32COMM_H
+
+#pragma once
+
+#define S32COMM_SIMULATION
+
+#include "osdfile.h"
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class s32comm_device : public device_t
+{
+public:
+ // construction/destruction
+ s32comm_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+ // single bit registers (74LS74)
+ uint8_t zfg_r(offs_t offset);
+ void zfg_w(uint8_t data);
+ // shared memory 2k
+ uint8_t share_r(offs_t offset);
+ void share_w(offs_t offset, uint8_t data);
+
+ // public API - stuff that gets called from host
+ // shared memory 2k
+ // reads/writes at I/O 0x800xxx
+ // - share_r
+ // - share_w
+ // single bit registers (74LS74)
+ // reads/writes at I/O 0x801000
+ uint8_t cn_r();
+ void cn_w(uint8_t data);
+ // reads/writes at I/O 0x801002
+ uint8_t fg_r();
+ void fg_w(uint8_t data);
+
+ // IRQ logic - 5 = VINT, 7 = DLC
+ void check_vint_irq();
+#ifdef S32COMM_SIMULATION
+ void set_linktype(uint16_t linktype);
+#endif
+
+protected:
+ // device-level overrides
+ virtual void device_start() override ATTR_COLD;
+ virtual void device_reset() override ATTR_COLD;
+ // optional information overrides
+ virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
+
+private:
+ uint8_t m_shared[0x800]{}; // 2k shared memory
+ uint8_t m_zfg = 0; // z80 flip gate? purpose unknown, bit0 is stored
+ uint8_t m_cn = 0; // bit0 is used to enable/disable the comm board
+ uint8_t m_fg = 0; // flip gate? purpose unknown, bit0 is stored, bit7 is connected to ZFG bit 0
+
+ osd_file::ptr m_line_rx; // rx line - can be either differential, simple serial or toslink
+ osd_file::ptr m_line_tx; // tx line - is differential, simple serial and toslink
+ char m_localhost[256]{};
+ char m_remotehost[256]{};
+ uint8_t m_buffer0[0x100]{};
+ uint8_t m_buffer1[0x100]{};
+ uint8_t m_framesync = 0;
+
+#ifdef S32COMM_SIMULATION
+ uint8_t m_linkenable = 0;
+ uint16_t m_linktimer = 0;
+ uint8_t m_linkalive = 0;
+ uint8_t m_linkid = 0;
+ uint8_t m_linkcount = 0;
+ uint16_t m_linktype = 0;
+
+ void comm_tick();
+ int read_frame(int dataSize);
+ void send_data(uint8_t frameType, int frameStart, int frameSize, int dataSize);
+ void send_frame(int dataSize);
+
+ void comm_tick_14084();
+ void comm_tick_15033();
+ void comm_tick_15612();
+#endif
+};
+
+// device type definition
+DECLARE_DEVICE_TYPE(S32COMM, s32comm_device)
+
+#endif // MAME_SEGA_S32COMM_H