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itt9216: Improve banking (nw)

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This commit is contained in:
AJR 2019-06-04 18:15:50 -04:00
parent e736ed9f05
commit c4c92aa335
1 changed files with 43 additions and 3 deletions
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46
src/mame/drivers/itt9216.cpp
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@ -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();
}