summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/sdk85/i8755.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/devices/bus/sdk85/i8755.cpp')
-rw-r--r--src/devices/bus/sdk85/i8755.cpp65
1 files changed, 65 insertions, 0 deletions
diff --git a/src/devices/bus/sdk85/i8755.cpp b/src/devices/bus/sdk85/i8755.cpp
new file mode 100644
index 00000000000..8c1d7a79fbf
--- /dev/null
+++ b/src/devices/bus/sdk85/i8755.cpp
@@ -0,0 +1,65 @@
+// license:BSD-3-Clause
+// copyright-holders:AJR
+
+#include "emu.h"
+#include "i8755.h"
+
+// device type definition
+DEFINE_DEVICE_TYPE(SDK85_I8755, sdk85exp_i8755_device, "sdk85exp_i8755", "SDK-85 PROM I/O Expansion (Intel 8755)")
+
+sdk85exp_i8755_device::sdk85exp_i8755_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : device_t(mconfig, SDK85_I8755, tag, owner, clock)
+ , device_sdk85_romexp_card_interface(mconfig, *this)
+ , m_i8755(*this, "i8755")
+{
+}
+
+void sdk85exp_i8755_device::device_start()
+{
+}
+
+u8 sdk85exp_i8755_device::read_memory(offs_t offset)
+{
+ return m_i8755->memory_r(offset);
+}
+
+void sdk85exp_i8755_device::write_memory(offs_t offset, u8 data)
+{
+ logerror("Writing %02Xh to base + %03Xh\n", data, offset);
+ m_i8755->io_w(offset & 3, data);
+}
+
+u8 sdk85exp_i8755_device::read_io(offs_t offset)
+{
+ return m_i8755->io_r(offset & 3);
+}
+
+void sdk85exp_i8755_device::write_io(offs_t offset, u8 data)
+{
+ m_i8755->io_w(offset & 3, data);
+}
+
+void sdk85exp_i8755_device::device_add_mconfig(machine_config &config)
+{
+ I8355(config, m_i8755, DERIVED_CLOCK(1, 1));
+}
+
+u8 *sdk85exp_i8755_device::get_rom_base(u32 size)
+{
+ if (size != 0x800)
+ {
+ osd_printf_error("sdk85exp_i8755: Data length must be 2,048 bytes\n");
+ return nullptr;
+ }
+
+ return memregion("i8755")->base();
+}
+
+ROM_START(sdk85exp_i8755)
+ ROM_REGION(0x800, "i8755", ROMREGION_ERASE00)
+ROM_END
+
+const tiny_rom_entry *sdk85exp_i8755_device::device_rom_region() const
+{
+ return ROM_NAME(sdk85exp_i8755);
+}