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Diffstat (limited to 'src/devices/bus/vcs_ctrl/wheel.c')
-rw-r--r--src/devices/bus/vcs_ctrl/wheel.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/src/devices/bus/vcs_ctrl/wheel.c b/src/devices/bus/vcs_ctrl/wheel.c
new file mode 100644
index 00000000000..9d1f3009596
--- /dev/null
+++ b/src/devices/bus/vcs_ctrl/wheel.c
@@ -0,0 +1,76 @@
+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ Atari Video Computer System Driving Wheel emulation
+
+**********************************************************************/
+
+#include "wheel.h"
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type VCS_WHEEL = &device_creator<vcs_wheel_device>;
+
+
+static INPUT_PORTS_START( vcs_wheel )
+ PORT_START("JOY")
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON1 ) // Pin 6
+ PORT_BIT( 0xdc, IP_ACTIVE_LOW, IPT_UNUSED )
+
+ PORT_START("WHEEL")
+ PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_X ) PORT_SENSITIVITY(40) PORT_KEYDELTA(5)
+INPUT_PORTS_END
+
+
+//-------------------------------------------------
+// input_ports - device-specific input ports
+//-------------------------------------------------
+
+ioport_constructor vcs_wheel_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( vcs_wheel );
+}
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// vcs_wheel_device - constructor
+//-------------------------------------------------
+
+vcs_wheel_device::vcs_wheel_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, VCS_WHEEL, "Atari / CBM Driving Wheel", tag, owner, clock, "vcs_wheel", __FILE__),
+ device_vcs_control_port_interface(mconfig, *this),
+ m_joy(*this, "JOY"),
+ m_wheel(*this, "WHEEL")
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void vcs_wheel_device::device_start()
+{
+}
+
+
+//-------------------------------------------------
+// vcs_joy_r - joystick read
+//-------------------------------------------------
+
+UINT8 vcs_wheel_device::vcs_joy_r()
+{
+ static const UINT8 driving_lookup[4] = { 0x00, 0x02, 0x03, 0x01 };
+
+ return m_joy->read() | driving_lookup[ ( m_wheel->read() & 0x18 ) >> 3 ];
+}