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(nw) pulsarlb: let's try a tap handle

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This commit is contained in:
Robbbert 2020-05-16 19:08:47 +10:00
parent 92b63a5f47
commit 2559960c24
1 changed files with 25 additions and 18 deletions
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43
src/mame/drivers/pulsar.cpp
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@ -61,6 +61,7 @@ public:
, m_floppy0(*this, "fdc:0")
, m_floppy1(*this, "fdc:1")
, m_rtc(*this, "rtc")
, m_ram(*this, "mainram")
{ }
void pulsar(machine_config &config);
@ -73,14 +74,12 @@ private:
DECLARE_WRITE8_MEMBER(ppi_pb_w);
DECLARE_WRITE8_MEMBER(ppi_pc_w);
DECLARE_READ8_MEMBER(ppi_pc_r);
u8 read_rom(u16 offset);
u8 read_rom(offs_t offset);
void io_map(address_map &map);
void mem_map(address_map &map);
bool m_boot_in_progress;
bool m_rom_in_map;
std::unique_ptr<u8[]> m_ram;
floppy_image_device *m_floppy;
required_device<z80_device> m_maincpu;
required_region_ptr<u8> m_rom;
@ -88,14 +87,14 @@ private:
required_device<floppy_connector> m_floppy0;
required_device<floppy_connector> m_floppy1;
required_device<msm5832_device> m_rtc;
memory_passthrough_handler *m_rom_shadow_tap;
required_shared_ptr<u8> m_ram;
};
void pulsar_state::mem_map(address_map &map)
{
map(0x0000, 0xffff).lrw8(NAME([this](u16 offset) { return m_ram[offset]; }),
NAME([this](u16 offset, u8 data) { m_ram[offset] = data; }));
map(0x0000, 0x07ff).lr8 (NAME([this](u16 offset) { if(m_boot_in_progress) return m_rom[offset]; else return m_ram[offset]; }));
map(0xf800, 0xffff).lr8 (NAME([this](u16 offset) { return read_rom(offset); }));
map(0x0000, 0xffff).ram().share("mainram");
map(0xf800, 0xffff).r(FUNC(pulsar_state::read_rom));
}
void pulsar_state::io_map(address_map &map)
@ -108,16 +107,12 @@ void pulsar_state::io_map(address_map &map)
map(0xf0, 0xf0).mirror(0x0f).w("brg", FUNC(com8116_device::stt_str_w));
}
u8 pulsar_state::read_rom(u16 offset)
u8 pulsar_state::read_rom(offs_t offset)
{
if (m_rom_in_map)
{
if (!machine().side_effects_disabled())
m_boot_in_progress = false;
return m_rom[offset];
}
else
return m_ram[offset | 0xf800];
return m_ram[offset+0xf800];
}
/*
@ -198,18 +193,30 @@ INPUT_PORTS_END
void pulsar_state::machine_reset()
{
m_boot_in_progress = true;
address_space &program = m_maincpu->space(AS_PROGRAM);
program.install_rom(0x0000, 0x07ff, m_rom); // do it here for F3
m_rom_shadow_tap = program.install_read_tap(0xf800, 0xffff, "rom_shadow_r",[this](offs_t offset, u8 &data, u8 mem_mask)
{
if (!machine().side_effects_disabled())
{
// delete this tap
m_rom_shadow_tap->remove();
// reinstall ram over the rom shadow
m_maincpu->space(AS_PROGRAM).install_ram(0x0000, 0x07ff, m_ram);
}
// return the original data
return data;
});
m_rom_in_map = true;
m_rtc->cs_w(1); // always enabled
}
void pulsar_state::machine_start()
{
m_ram = make_unique_clear<u8[]>(0x10000);
// register for savestates
save_pointer(NAME(m_ram), 0x10000);
save_item(NAME(m_boot_in_progress));
save_item(NAME(m_rom_in_map));
}