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+// license:BSD-3-Clause
+// copyright-holders:Vas Crabb
+/***********************************************************************
+
+ Orange Micro Grappler+ Printer Interface
+
+ With references to schematic from Grapplerâ„¢+ Printer Interface
+ Series Operators Manual (© Orange Micro, Inc. 1982). This uses
+ the IC locations on the "long" version of the card. The newer
+ "short" version of the card has slightly different circuitry
+ and completely different IC locations.
+
+ 26-pin two-row header to printer:
+
+ STB 1 2 GND
+ D0 3 4 GND
+ D1 5 6 GND
+ D2 7 8 GND
+ D3 9 10 GND
+ D4 11 12 GND
+ D5 23 14 GND
+ D6 15 16 GND
+ D7 17 18 GND
+ ACK 19 20 GND
+ BUSY 21 22 GND
+ P.E. 23 24 GND
+ SLCT 25 26 GND
+
+***********************************************************************/
+#ifndef MAME_BUS_A2BUS_GRAPPLERPLUS_H
+#define MAME_BUS_A2BUS_GRAPPLERPLUS_H
+
+#pragma once
+
+#include "a2bus.h"
+#include "bus/centronics/ctronics.h"
+
+class a2bus_grapplerplus_device : public device_t, public device_a2bus_card_interface
+{
+public:
+ a2bus_grapplerplus_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock);
+
+ // DIP switch handlers
+ DECLARE_INPUT_CHANGED_MEMBER(sw_msb);
+
+ // device_a2bus_card_interface implementation
+ virtual u8 read_c0nx(u8 offset) override;
+ virtual void write_c0nx(u8 offset, u8 data) override;
+ virtual u8 read_cnxx(u8 offset) override;
+ virtual u8 read_c800(u16 offset) override;
+
+protected:
+ // device_t implementation
+ virtual tiny_rom_entry const *device_rom_region() const override;
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual ioport_constructor device_input_ports() const override;
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+ // timer handlers
+ TIMER_CALLBACK_MEMBER(update_strobe);
+
+private:
+ // printer status inputs
+ DECLARE_WRITE_LINE_MEMBER(ack_w);
+ DECLARE_WRITE_LINE_MEMBER(busy_w);
+ DECLARE_WRITE_LINE_MEMBER(pe_w);
+ DECLARE_WRITE_LINE_MEMBER(slct_w);
+
+ required_device<centronics_device> m_printer_conn;
+ required_device<output_latch_device> m_printer_out;
+ required_ioport m_s1;
+ required_region_ptr<u8> m_rom;
+ emu_timer * m_strobe_timer;
+
+ u16 m_rom_bank; // U2D (pin 13)
+ u8 m_data_latch; // U10
+ u8 m_ack_latch; // U2C (pin 9)
+ u8 m_irq_disable; // U2A (pin 4)
+ u8 m_irq; // U3D (pin 13)
+ u8 m_next_strobe; // U5A (pin 5)
+ u8 m_ack_in; // printer connector pin 19
+ u8 m_busy_in; // printer connector pin 21
+ u8 m_pe_in; // printer connector pin 23
+ u8 m_slct_in; // printer connector pin 25
+};
+
+
+DECLARE_DEVICE_TYPE(A2BUS_GRAPPLERPLUS, a2bus_grapplerplus_device)
+
+#endif // MAME_BUS_A2BUS_GRAPPLERPLUS_H