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-rw-r--r--src/devices/bus/keytronic/keytronic.h100
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diff --git a/src/devices/bus/keytronic/keytronic.h b/src/devices/bus/keytronic/keytronic.h
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+// license:BSD-3-Clause
+// copyright-holders:AJR
+/***************************************************************************
+
+ Generic Keytronic serial keyboard connector
+
+***************************************************************************/
+
+#ifndef MAME_BUS_KEYTRONIC_KEYTRONIC_H
+#define MAME_BUS_KEYTRONIC_KEYTRONIC_H
+
+#pragma once
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// forward declaration
+class device_keytronic_interface;
+
+// ======================> keytronic_connector_device
+
+class keytronic_connector_device : public device_t, public device_single_card_slot_interface<device_keytronic_interface>
+{
+ friend class device_keytronic_interface;
+
+public:
+ // construction/destruction
+ keytronic_connector_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+ template <typename T>
+ keytronic_connector_device(const machine_config &mconfig, const char *tag, device_t *owner, T &&opts, const char *dflt)
+ : keytronic_connector_device(mconfig, tag, owner, 0U)
+ {
+ option_reset();
+ opts(*this);
+ set_default_option(dflt);
+ set_fixed(false);
+ }
+
+ // callback configuration
+ auto ser_out_callback() { return m_ser_out_callback.bind(); }
+
+ // serial line input
+ inline void ser_in_w(int state);
+
+protected:
+ // device_t implementation
+ virtual void device_config_complete() override;
+ virtual void device_start() override ATTR_COLD;
+
+ // called from keyboard
+ void ser_out_w(int state) { m_ser_out_callback(state); }
+
+private:
+ // user callback
+ devcb_write_line m_ser_out_callback;
+
+ // selected keyboard
+ device_keytronic_interface *m_kbd;
+};
+
+// ======================> device_keytronic_interface
+
+class device_keytronic_interface : public device_interface
+{
+ friend class keytronic_connector_device;
+
+protected:
+ // construction/destruction
+ device_keytronic_interface(const machine_config &mconfig, device_t &device);
+ virtual ~device_keytronic_interface();
+
+ void ser_out_w(int state) { m_port->ser_out_w(state); }
+
+ virtual void ser_in_w(int state) = 0;
+
+private:
+ // parent port
+ required_device<keytronic_connector_device> m_port;
+};
+
+// type definition
+DECLARE_DEVICE_TYPE(KEYTRONIC_CONNECTOR, keytronic_connector_device)
+
+// supported keyboards
+void ascii_terminal_keyboards(device_slot_interface &device);
+void kaypro_keyboards(device_slot_interface &device);
+
+//**************************************************************************
+// INLINE FUNCTIONS
+//**************************************************************************
+
+void keytronic_connector_device::ser_in_w(int state)
+{
+ if (m_kbd != nullptr)
+ m_kbd->ser_in_w(state);
+}
+
+#endif // MAME_BUS_KEYTRONIC_KEYTRONIC_H