summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/machine/mos8726.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/devices/machine/mos8726.cpp')
-rw-r--r--src/devices/machine/mos8726.cpp125
1 files changed, 125 insertions, 0 deletions
diff --git a/src/devices/machine/mos8726.cpp b/src/devices/machine/mos8726.cpp
new file mode 100644
index 00000000000..eca6ada5187
--- /dev/null
+++ b/src/devices/machine/mos8726.cpp
@@ -0,0 +1,125 @@
+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ MOS 8726R1 DMA Controller emulation
+
+**********************************************************************/
+
+/*
+
+ TODO:
+
+ - all
+
+*/
+
+#include "mos8726.h"
+
+
+
+//**************************************************************************
+// MACROS / CONSTANTS
+//**************************************************************************
+
+
+
+//**************************************************************************
+// DEVICE TYPE DEFINITIONS
+//**************************************************************************
+
+const device_type MOS8726 = &device_creator<mos8726_device>;
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// mos8726_device - constructor
+//-------------------------------------------------
+
+mos8726_device::mos8726_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, MOS8726, "MOS8726", tag, owner, clock, "mos8726", __FILE__),
+ device_execute_interface(mconfig, *this),
+ m_icount(0),
+ m_bs(1)
+{ }
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void mos8726_device::device_start()
+{
+ // set our instruction counter
+ m_icountptr = &m_icount;
+
+ // save state
+ save_item(NAME(m_bs));
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void mos8726_device::device_reset()
+{
+}
+
+
+//-------------------------------------------------
+// execute_run -
+//-------------------------------------------------
+
+void mos8726_device::execute_run()
+{
+ do
+ {
+ m_icount--;
+ } while (m_icount > 0);
+}
+
+
+//-------------------------------------------------
+// read -
+//-------------------------------------------------
+
+READ8_MEMBER( mos8726_device::read )
+{
+ UINT8 data = 0;
+
+ return data;
+}
+
+
+//-------------------------------------------------
+// write -
+//-------------------------------------------------
+
+WRITE8_MEMBER( mos8726_device::write )
+{
+}
+
+
+//-------------------------------------------------
+// bs_w - bank select write
+//-------------------------------------------------
+
+WRITE_LINE_MEMBER( mos8726_device::bs_w )
+{
+ m_bs = state;
+}
+
+
+//-------------------------------------------------
+// romsel_r - ROM select read
+//-------------------------------------------------
+
+int mos8726_device::romsel_r(int roml, int romh)
+{
+ return roml && romh;
+}