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Diffstat (limited to 'src/devices/bus/tanbus/tugpgm.cpp')
-rw-r--r--src/devices/bus/tanbus/tugpgm.cpp113
1 files changed, 113 insertions, 0 deletions
diff --git a/src/devices/bus/tanbus/tugpgm.cpp b/src/devices/bus/tanbus/tugpgm.cpp
new file mode 100644
index 00000000000..e97b0853f64
--- /dev/null
+++ b/src/devices/bus/tanbus/tugpgm.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ TUG Programmable Graphic Module
+
+ http://www.microtan.ukpc.net/pageProducts.html#VIDEO
+
+**********************************************************************/
+
+
+#include "emu.h"
+#include "tugpgm.h"
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(TANBUS_TUGPGM, tanbus_tugpgm_device, "tanbus_tugpgm", "TUG Programmable Graphic Module")
+
+
+//-------------------------------------------------
+// INPUT_PORTS( tugpgm )
+//-------------------------------------------------
+
+INPUT_PORTS_START(tugpgm)
+ PORT_START("LINKS")
+ PORT_DIPNAME(0x07, 0x04, "Address Select")
+ PORT_DIPSETTING(0x00, "$0400 - $07FF (Not Recommended)")
+ PORT_DIPSETTING(0x01, "$2400 - $27FF")
+ PORT_DIPSETTING(0x02, "$4400 - $47FF")
+ PORT_DIPSETTING(0x03, "$6400 - $67FF")
+ PORT_DIPSETTING(0x04, "$8400 - $87FF")
+ PORT_DIPSETTING(0x05, "$A400 - $A7FF")
+ PORT_DIPSETTING(0x06, "$C400 - $C7FF")
+ PORT_DIPSETTING(0x07, "$E400 - $E7FF")
+INPUT_PORTS_END
+
+//-------------------------------------------------
+// input_ports - device-specific input ports
+//-------------------------------------------------
+
+ioport_constructor tanbus_tugpgm_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME(tugpgm);
+}
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// tanbus_tugpgm_device - constructor
+//-------------------------------------------------
+
+tanbus_tugpgm_device::tanbus_tugpgm_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, TANBUS_TUGPGM, tag, owner, clock)
+ , device_tanbus_interface(mconfig, *this)
+ , m_links(*this, "LINKS")
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void tanbus_tugpgm_device::device_start()
+{
+ m_ram = std::make_unique<uint8_t[]>(0x0400);
+
+ /* randomize video memory contents */
+ for (uint16_t addr = 0; addr < 0x0400; addr++)
+ {
+ m_ram[addr] = machine().rand() & 0xff;
+ m_tanbus->pgm_w(addr, m_ram[addr]);
+ }
+
+ save_pointer(NAME(m_ram), 0x0400);
+}
+
+//-------------------------------------------------
+// read - card read
+//-------------------------------------------------
+
+uint8_t tanbus_tugpgm_device::read(offs_t offset, int inhrom, int inhram, int be)
+{
+ uint8_t data = 0xff;
+
+ if ((offset & 0xfc00) == ((m_links->read() << 13) | 0x0400))
+ {
+ data = m_ram[offset & 0x3ff];
+ }
+
+ return data;
+}
+
+//-------------------------------------------------
+// write - card write
+//-------------------------------------------------
+
+void tanbus_tugpgm_device::write(offs_t offset, uint8_t data, int inhrom, int inhram, int be)
+{
+ if ((offset & 0xfc00) == ((m_links->read() << 13) | 0x0400))
+ {
+ m_ram[offset & 0x3ff] = data;
+
+ /* update the chargen on the CPU board */
+ m_tanbus->pgm_w(offset & 0x3ff, data);
+ }
+}