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diff --git a/src/devices/video/bt431.h b/src/devices/video/bt431.h
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+// license:BSD-3-Clause
+// copyright-holders:Patrick Mackinlay
+
+#ifndef MAME_VIDEO_BT431_H
+#define MAME_VIDEO_BT431_H
+
+#pragma once
+
+class bt431_device : public device_t
+{
+public:
+ bt431_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock);
+
+ enum register_number : unsigned
+ {
+ REG_COMMAND = 0,
+ REG_CURSOR_X_LO = 1,
+ REG_CURSOR_X_HI = 2,
+ REG_CURSOR_Y_LO = 3,
+ REG_CURSOR_Y_HI = 4,
+ REG_WINDOW_X_LO = 5,
+ REG_WINDOW_X_HI = 6,
+ REG_WINDOW_Y_LO = 7,
+ REG_WINDOW_Y_HI = 8,
+ REG_WINDOW_W_LO = 9,
+ REG_WINDOW_W_HI = 10,
+ REG_WINDOW_H_LO = 11,
+ REG_WINDOW_H_HI = 12,
+ };
+
+ enum command_mask : u8
+ {
+ CR_D1D0 = 0x03, // cross hair cursor thickness
+ CR_D3D2 = 0x0c, // multiplex control
+ CR_D4 = 0x10, // cursor format control
+ CR_D5 = 0x20, // cross hair cursor enable
+ CR_D6 = 0x40, // 64x64 cursor enable
+ };
+
+ enum cr_d1d0_mask : u8
+ {
+ CR_D1D0_1PIX = 0x00, // 1 pixel
+ CR_D1D0_3PIX = 0x01, // 3 pixels
+ CR_D1D0_5PIX = 0x02, // 5 pixels
+ CR_D1D0_7PIX = 0x03, // 7 pixels
+ };
+ enum cr_d3d2_mask : u8
+ {
+ CR_D3D2_11 = 0x00, // 1:1 multiplexing
+ CR_D3D2_41 = 0x04, // 4:1 multiplexing
+ CR_D3D2_51 = 0x08, // 5:1 multiplexing
+ };
+
+ void map(address_map &map);
+ bool cur_r(unsigned x, unsigned y) const;
+
+protected:
+ static constexpr u16 ADDRESS_MASK = 0x01ff;
+
+ // device_t overrides
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+ template <unsigned S> u8 addr_r() { return m_address >> S; }
+ template <unsigned S> void addr_w(u8 data) { m_address = (m_address & (0xff00 >> S)) | (u16(data) << S); }
+
+ u8 ram_r();
+ void ram_w(u8 data);
+
+ u8 reg_r();
+ void reg_w(u8 data);
+
+private:
+ void update();
+
+ // registers
+ u16 m_address;
+ u8 m_command;
+ u16 m_cursor_x;
+ u16 m_cursor_y;
+ u16 m_window_x;
+ u16 m_window_y;
+ u16 m_window_w;
+ u16 m_window_h;
+
+ u8 m_ram[512];
+
+ rectangle m_bm_window;
+ rectangle m_ch_h;
+ rectangle m_ch_v;
+};
+
+DECLARE_DEVICE_TYPE(BT431, bt431_device)
+
+#endif // MAME_VIDEO_BT431_H