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att630: Vectors lie in BRAM, so no callback needed after all (nw)

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This commit is contained in:
AJR 2019-06-26 08:00:54 -04:00
parent ed03a023f6
commit b26efa5165
1 changed files with 2 additions and 44 deletions
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46
src/mame/drivers/att630.cpp
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@ -29,21 +29,15 @@ protected:
private:
u32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
template<int Line> DECLARE_WRITE_LINE_MEMBER(irq_w);
TIMER_CALLBACK_MEMBER(update_interrupts);
u8 bram_r(offs_t offset);
void bram_w(offs_t offset, u8 data);
u8 irq_vec_r();
void mem_map(address_map &map);
void vec_map(address_map &map);
required_device<cpu_device> m_maincpu;
required_device<m68000_device> m_maincpu;
required_shared_ptr<u16> m_vram;
std::unique_ptr<u8[]> m_bram_data;
u8 m_pending_interrupts;
};
void att630_state::machine_start()
@ -51,10 +45,7 @@ void att630_state::machine_start()
m_bram_data = std::make_unique<u8[]>(0x2000);
subdevice<nvram_device>("bram")->set_base(m_bram_data.get(), 0x2000);
m_pending_interrupts = 0;
save_pointer(NAME(m_bram_data), 0x2000);
save_item(NAME(m_pending_interrupts));
}
u32 att630_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
@ -66,34 +57,6 @@ u32 att630_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, con
return 0;
}
template <int Line>
WRITE_LINE_MEMBER(att630_state::irq_w)
{
if (BIT(m_pending_interrupts, Line) == state)
return;
if (state)
m_pending_interrupts |= 0x01 << Line;
else
m_pending_interrupts &= ~(0x01 << Line);
machine().scheduler().synchronize(timer_expired_delegate(FUNC(att630_state::update_interrupts), this));
}
TIMER_CALLBACK_MEMBER(att630_state::update_interrupts)
{
m_maincpu->set_input_line(M68K_IRQ_1, m_pending_interrupts != 0 ? ASSERT_LINE : CLEAR_LINE);
}
u8 att630_state::irq_vec_r()
{
for (int level = 7; level > 0; level--)
if (BIT(m_pending_interrupts, level))
return 0x40 + level;
return 0x40;
}
u8 att630_state::bram_r(offs_t offset)
{
return m_bram_data[offset];
@ -118,11 +81,6 @@ void att630_state::mem_map(address_map &map)
map(0xe00000, 0xe03fff).mirror(0x1fc000).rw(FUNC(att630_state::bram_r), FUNC(att630_state::bram_w)).umask16(0x00ff);
}
void att630_state::vec_map(address_map &map)
{
map(0xfffff3, 0xfffff3).r(FUNC(att630_state::irq_vec_r));
}
static INPUT_PORTS_START( att630 )
INPUT_PORTS_END
@ -130,7 +88,7 @@ void att630_state::att630(machine_config &config)
{
M68000(config, m_maincpu, 40_MHz_XTAL / 4); // clock not confirmed
m_maincpu->set_addrmap(AS_PROGRAM, &att630_state::mem_map);
m_maincpu->set_addrmap(m68000_device::AS_CPU_SPACE, &att630_state::vec_map);
m_maincpu->set_cpu_space(AS_PROGRAM); // vectors are in BRAM
NVRAM(config, "bram", nvram_device::DEFAULT_ALL_0); // 5264 + battery