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pss680: Bank some of the ROM space

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This commit is contained in:
AJR 2021-09-22 13:59:42 -04:00
parent cc66d8797b
commit f6d04b9e87
1 changed files with 23 additions and 2 deletions
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25
src/mame/drivers/ympsr16.cpp
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@ -22,6 +22,7 @@ public:
yamaha_psr16_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_rombank(*this, "rombank")
{
}
@ -29,8 +30,12 @@ public:
void psr36(machine_config &config);
void pss680(machine_config &config);
protected:
virtual void machine_start() override;
private:
u8 busy_r();
void bank_w(u8 data);
void common_map(address_map &map);
void psr16_map(address_map &map);
@ -38,8 +43,18 @@ private:
void pss680_map(address_map &map);
required_device<cpu_device> m_maincpu;
optional_memory_bank m_rombank;
};
void yamaha_psr16_state::machine_start()
{
if (m_rombank.found())
{
m_rombank->configure_entries(0, 0x10, memregion("program")->base(), 0x4000);
m_rombank->set_entry(0);
}
}
u8 yamaha_psr16_state::busy_r()
{
@ -47,6 +62,11 @@ u8 yamaha_psr16_state::busy_r()
return 0;
}
void yamaha_psr16_state::bank_w(u8 data)
{
m_rombank->set_entry(data & 0x0f);
}
void yamaha_psr16_state::common_map(address_map &map)
{
map(0x0000, 0x00ff).mirror(0x100).ram();
@ -76,10 +96,11 @@ void yamaha_psr16_state::psr36_map(address_map &map)
void yamaha_psr16_state::pss680_map(address_map &map)
{
common_map(map);
map(0x1800, 0x1802).nopw();
map(0x1800, 0x1800).w(FUNC(yamaha_psr16_state::bank_w));
map(0x1801, 0x1802).nopw();
map(0x1810, 0x1811).nopr();
map(0x2000, 0x3fff).ram();
map(0x4000, 0x7fff).rom().region("program", 0x8000);
map(0x4000, 0x7fff).bankr("rombank");
map(0x8000, 0xffff).rom().region("program", 0);
}