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-rw-r--r--src/devices/bus/centronics/spjoy.cpp94
1 files changed, 94 insertions, 0 deletions
diff --git a/src/devices/bus/centronics/spjoy.cpp b/src/devices/bus/centronics/spjoy.cpp
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+++ b/src/devices/bus/centronics/spjoy.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/***************************************************************************
+
+ The Serial Port / Vertical Twist Joystick Interface
+
+ Notes:
+ - Test cases for this joystick are Paradroid 2000 (paradr2k) and Blowpipe (blowpipe).
+
+***************************************************************************/
+
+#include "emu.h"
+#include "spjoy.h"
+
+DEFINE_DEVICE_TYPE(SERIAL_PORT_JOYSTICK, serial_port_joystick_device, "spjoy", "The Serial Port/Vertical Twist Joystick Interface")
+
+serial_port_joystick_device::serial_port_joystick_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, SERIAL_PORT_JOYSTICK, tag, owner, clock)
+ , device_centronics_peripheral_interface( mconfig, *this )
+ , m_joy(*this, "joy_p%u", 1U)
+ , m_data(0xff)
+ , m_busy(0)
+ , m_ack(0)
+{
+}
+
+void serial_port_joystick_device::device_start()
+{
+ save_item(NAME(m_data));
+ save_item(NAME(m_busy));
+ save_item(NAME(m_ack));
+}
+
+void serial_port_joystick_device::update_busy_ack()
+{
+ int busy = 0;
+ int ack = 0;
+
+ if (~m_data & 0x7f)
+ {
+ if ((~m_data & 0x5f) & (~m_joy[0]->read() & 0x5f))
+ {
+ busy = 1;
+ }
+ if ((~m_data & 0x5f) & (~m_joy[1]->read() & 0x5f))
+ {
+ ack = 1;
+ }
+ if (~m_data & 0x20)
+ {
+ busy = ack = 1;
+ }
+ }
+
+ if (m_busy != busy)
+ {
+ m_busy = busy;
+ output_busy(busy);
+ }
+
+ if (m_ack != ack)
+ {
+ m_ack = ack;
+ output_ack(!ack);
+ }
+}
+
+
+static INPUT_PORTS_START( serial_port_joystick )
+ PORT_START("joy_p1")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_PLAYER(1)
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_PLAYER(1)
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_PLAYER(1)
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(1)
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1)
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNUSED )
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1)
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNUSED )
+
+ PORT_START("joy_p2")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_PLAYER(2)
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_PLAYER(2)
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_PLAYER(2)
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(2)
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNUSED )
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2)
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNUSED )
+INPUT_PORTS_END
+
+ioport_constructor serial_port_joystick_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( serial_port_joystick );
+}