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-rw-r--r--src/devices/machine/psion_asic4.h59
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diff --git a/src/devices/machine/psion_asic4.h b/src/devices/machine/psion_asic4.h
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+++ b/src/devices/machine/psion_asic4.h
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/******************************************************************************
+
+ Psion ASIC4
+
+******************************************************************************/
+
+#ifndef MAME_MACHINE_PSION_ASIC4_H
+#define MAME_MACHINE_PSION_ASIC4_H
+
+#pragma once
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> psion_asic4_device
+
+class psion_asic4_device : public device_t, public device_memory_interface
+{
+public:
+ psion_asic4_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
+
+ void set_ext_info_byte(uint16_t info) { m_info_byte = info; }
+
+ void data_w(uint16_t data);
+ uint8_t data_r();
+
+protected:
+ // device_t overrides
+ virtual void device_start() override ATTR_COLD;
+ virtual void device_reset() override ATTR_COLD;
+
+ // device_memory_interface overrides
+ virtual space_config_vector memory_space_config() const override;
+
+private:
+ address_space_config m_space_config;
+
+ address_space *m_space;
+
+ static constexpr uint16_t NULL_FRAME = 0x000;
+ static constexpr uint16_t CONTROL_FRAME = 0x100;
+ static constexpr uint16_t DATA_FRAME = 0x200;
+
+ uint32_t m_addr_latch;
+ uint8_t m_addr_writes;
+
+ uint16_t m_info_byte;
+ uint8_t m_sibo_control;
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(PSION_ASIC4, psion_asic4_device)
+
+#endif // MAME_MACHINE_PSION_ASIC4_H