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hds200: Add rom banking

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This commit is contained in:
Dirk Best 2021-12-09 09:17:05 +01:00
parent 9e229dd40e
commit 3928edfe97
1 changed files with 25 additions and 5 deletions
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30
src/mame/drivers/hds200.cpp
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@ -20,10 +20,14 @@
- XTAL 22.680 MHz and 35.640 MHz (video)
TODO:
- Everything
- Z80DMA/SCN2674 hookup
- Keyboard
- RS232 ports
- Sound? (if supported)
Notes:
-
- The PCB has a large unpopulated area. Possibly this is used for the
200G variant.
***************************************************************************/
@ -54,13 +58,15 @@ public:
m_dma(*this, "dma"),
m_screen(*this, "screen"),
m_avdc(*this, "avdc"),
m_duart(*this, "duart%u", 0U)
m_duart(*this, "duart%u", 0U),
m_rombank(*this, "rombank")
{ }
void hds200(machine_config &config);
protected:
virtual void machine_start() override;
virtual void machine_reset() override;
private:
void mem_map(address_map &map);
@ -71,6 +77,7 @@ private:
required_device<screen_device> m_screen;
required_device<scn2674_device> m_avdc;
required_device_array<scn2681_device, 2> m_duart;
required_memory_bank m_rombank;
void duart0_out_w(uint8_t data);
void duart1_out_w(uint8_t data);
@ -83,7 +90,8 @@ private:
void hds200_state::mem_map(address_map &map)
{
map(0x0000, 0x5fff).rom().region("maincpu", 0);
map(0x0000, 0x3fff).rom().region("maincpu", 0);
map(0x4000, 0x5fff).bankr(m_rombank);
map(0x6800, 0x6fff).ram(); // nvram?
map(0x8000, 0xbfff).ram();
map(0xc000, 0xffff).noprw(); // expansion ram
@ -130,11 +138,23 @@ void hds200_state::duart0_out_w(uint8_t data)
void hds200_state::duart1_out_w(uint8_t data)
{
// 76543--- unknown
// -----2-- rombank
// ------10 unknown
logerror("duart1_out_w: %02x\n", data);
m_rombank->set_entry(!BIT(data, 2));
}
void hds200_state::machine_start()
{
m_rombank->configure_entries(0, 2, memregion("maincpu")->base() + 0x4000, 0x2000);
}
void hds200_state::machine_reset()
{
m_rombank->set_entry(0);
}
@ -203,4 +223,4 @@ ROM_END
//**************************************************************************
// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
COMP( 198?, hds200, 0, 0, hds200, 0, hds200_state, empty_init, "Human Designed Systems", "HDS200", MACHINE_IS_SKELETON )
COMP( 198?, hds200, 0, 0, hds200, 0, hds200_state, empty_init, "Human Designed Systems", "HDS200", MACHINE_NOT_WORKING | MACHINE_NO_SOUND )