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-rw-r--r--src/mame/video/vsystem_gga.h57
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diff --git a/src/mame/video/vsystem_gga.h b/src/mame/video/vsystem_gga.h
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+// license:BSD-3-Clause
+// copyright-holders:AJR
+/******************************************************************************
+
+ Video System C7-01 GGA
+
+******************************************************************************/
+
+#pragma once
+
+#ifndef MAME_VIDEO_VSYSTEM_GGA_H
+#define MAME_VIDEO_VSYSTEM_GGA_H
+
+//**************************************************************************
+// CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_VSYSTEM_GGA_REGISTER_WRITE_CB(_devcb) \
+ devcb = &vsystem_gga_device::static_set_write_cb(*device, DEVCB_##_devcb);
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> vsystem_gga_device
+
+class vsystem_gga_device : public device_t, public device_video_interface
+{
+public:
+ // construction/destruction
+ vsystem_gga_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+ // static configuration
+ template<class Obj> static devcb_base &static_set_write_cb(device_t &device, Obj &&object) { return downcast<vsystem_gga_device &>(device).m_write_cb.set_callback(std::forward<Obj>(object)); }
+
+ // memory handlers
+ DECLARE_WRITE8_MEMBER(write);
+
+ // temporary accessor
+ u8 reg(u8 offset) const { return m_regs[offset]; }
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+
+private:
+ // internal state
+ u8 m_address_latch;
+ u8 m_regs[16];
+ devcb_write8 m_write_cb;
+};
+
+// device type definition
+extern const device_type VSYSTEM_GGA;
+
+#endif