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Diffstat (limited to 'src/mame/drivers/itt9216.cpp')
-rw-r--r--src/mame/drivers/itt9216.cpp46
1 files changed, 43 insertions, 3 deletions
diff --git a/src/mame/drivers/itt9216.cpp b/src/mame/drivers/itt9216.cpp
index 7b67812ea8e..57d3258177d 100644
--- a/src/mame/drivers/itt9216.cpp
+++ b/src/mame/drivers/itt9216.cpp
@@ -2,7 +2,7 @@
// copyright-holders:AJR
/***********************************************************************************************************************************
-Skeleton driver for ITT Courier 9216 IBM-compatible color display terminal.
+Skeleton driver for ITT Courier 9216 IBM 3179-compatible color display terminal.
************************************************************************************************************************************/
@@ -16,23 +16,63 @@ public:
itt9216_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
+ , m_program(*this, "program")
, m_chargen(*this, "chargen")
{
}
void itt9216(machine_config &config);
+protected:
+ virtual void machine_start() override;
+ virtual void machine_reset() override;
+
private:
+ u8 ram_rom_r(offs_t offset);
+ void ram_w(offs_t offset, u8 data);
+
void mem_map(address_map &map);
required_device<cpu_device> m_maincpu;
+ required_region_ptr<u8> m_program;
required_region_ptr<u8> m_chargen;
+
+ std::unique_ptr<u8[]> m_mainram;
+ bool m_rom_enabled;
};
+void itt9216_state::machine_start()
+{
+ m_mainram = make_unique_clear<u8[]>(0x10000);
+
+ save_item(NAME(m_rom_enabled));
+ save_pointer(NAME(m_mainram), 0x10000);
+}
+
+void itt9216_state::machine_reset()
+{
+ m_rom_enabled = true;
+}
+
+u8 itt9216_state::ram_rom_r(offs_t offset)
+{
+ if (m_rom_enabled)
+ return m_program[offset & 0x1fff];
+ else
+ return m_mainram[offset];
+}
+
+void itt9216_state::ram_w(offs_t offset, u8 data)
+{
+ m_mainram[offset] = data;
+ if (!machine().side_effects_disabled())
+ m_rom_enabled = false;
+}
+
void itt9216_state::mem_map(address_map &map)
{
- map(0x00000, 0x00007).rom().region("program", 0);
- map(0x00008, 0x0ffff).ram();
+ map(0x00000, 0x0ffff).rw(FUNC(itt9216_state::ram_rom_r), FUNC(itt9216_state::ram_w));
+ map(0x10000, 0x11fff).ram();
map(0x58000, 0x59fff).rom().region("program", 0);
map(0x62000, 0x62fff).ram();
}