summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/a2gameio/joyport.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/devices/bus/a2gameio/joyport.cpp')
-rw-r--r--src/devices/bus/a2gameio/joyport.cpp106
1 files changed, 106 insertions, 0 deletions
diff --git a/src/devices/bus/a2gameio/joyport.cpp b/src/devices/bus/a2gameio/joyport.cpp
new file mode 100644
index 00000000000..987724adb91
--- /dev/null
+++ b/src/devices/bus/a2gameio/joyport.cpp
@@ -0,0 +1,106 @@
+// license:BSD-3-Clause
+// copyright-holders:R. Belmont
+/*********************************************************************
+
+ Sirius JoyPort - connects 2 digital joysticks to Apple II and II Plus
+
+ This doesn't work on the IIe or IIgs because the buttons are
+ active low, meaning those systems always go into self-test if a
+ JoyPort is connected. Also, the annunciator useage could clash
+ with double-hi-res on those systems.
+
+ IIc and IIc Plus are out because they don't have annunciator outputs.
+
+*********************************************************************/
+
+#include "emu.h"
+#include "bus/a2gameio/joyport.h"
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+// device type definition
+DEFINE_DEVICE_TYPE(APPLE2_JOYPORT, apple2_joyport_device, "a2joyprt", "Sirius JoyPort")
+
+//**************************************************************************
+// PARAMETERS
+//**************************************************************************
+
+#define JOYSTICK_DELTA 80
+#define JOYSTICK_SENSITIVITY 50
+#define JOYSTICK_AUTOCENTER 80
+
+//**************************************************************************
+// INPUT PORTS
+//**************************************************************************
+
+static INPUT_PORTS_START( apple2_joyport )
+ PORT_START("joystick_p1")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP )
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT )
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN )
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT )
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 )
+
+ PORT_START("joystick_p2")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_PLAYER(2)
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(2)
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_PLAYER(2)
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_PLAYER(2)
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
+INPUT_PORTS_END
+
+//**************************************************************************
+// DEVICE IMPLEMENTATION
+//**************************************************************************
+
+apple2_joyport_device::apple2_joyport_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : device_t(mconfig, APPLE2_JOYPORT, tag, owner, clock)
+ , device_a2gameio_interface(mconfig, *this)
+ , m_player1(*this, "joystick_p1")
+ , m_player2(*this, "joystick_p2")
+{
+}
+
+ioport_constructor apple2_joyport_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME(apple2_joyport);
+}
+
+void apple2_joyport_device::device_start()
+{
+ save_item(NAME(m_an0));
+ save_item(NAME(m_an1));
+}
+
+READ_LINE_MEMBER(apple2_joyport_device::sw0_r)
+{
+ u8 port_read = m_an1 ? m_player2->read() : m_player1->read();
+
+ return BIT(port_read, 4);
+}
+
+READ_LINE_MEMBER(apple2_joyport_device::sw1_r)
+{
+ u8 port_read = m_an1 ? m_player2->read() : m_player1->read();
+
+ return m_an1 ? BIT(port_read, 0) : BIT(port_read, 3);
+}
+
+READ_LINE_MEMBER(apple2_joyport_device::sw2_r)
+{
+ u8 port_read = m_an1 ? m_player2->read() : m_player1->read();
+
+ return m_an1 ? BIT(port_read, 2) : BIT(port_read, 1);
+}
+
+WRITE_LINE_MEMBER(apple2_joyport_device::an0_w)
+{
+ m_an0 = state;
+}
+
+WRITE_LINE_MEMBER(apple2_joyport_device::an1_w)
+{
+ m_an1 = state;
+}