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author AJR <ajrhacker@users.noreply.github.com>2021-09-22 13:59:42 -0400
committer AJR <ajrhacker@users.noreply.github.com>2021-09-22 13:59:42 -0400
commitf6d04b9e87c30feb9525752679bf90815e7866be (patch)
tree28d8eac0c0edf3d483cfa5463c7a0a12694b5c60
parentcc66d8797b1282b30b72e2b3336d013ee87aa277 (diff)
pss680: Bank some of the ROM space
-rw-r--r--src/mame/drivers/ympsr16.cpp25
1 files changed, 23 insertions, 2 deletions
diff --git a/src/mame/drivers/ympsr16.cpp b/src/mame/drivers/ympsr16.cpp
index 8ca257be9cc..10860d47d08 100644
--- a/src/mame/drivers/ympsr16.cpp
+++ b/src/mame/drivers/ympsr16.cpp
@@ -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);
}