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cbus/pc9801_26.cpp: hookup irq select, guesswork for DE-9 output pins

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This commit is contained in:
angelosa 2025-04-24 11:04:38 +02:00
parent 924cd5def2
commit 249df925a8
2 changed files with 47 additions and 20 deletions
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65
src/devices/bus/cbus/pc9801_26.cpp
View File

@ -32,6 +32,7 @@ pc9801_26_device::pc9801_26_device(const machine_config &mconfig, const char *ta
, m_bus(*this, DEVICE_SELF_OWNER)
, m_opn(*this, "opn")
, m_joy(*this, "joy_p%u", 1U)
, m_irq_jp(*this, "JP6A1_JP6A3")
{
}
@ -39,15 +40,41 @@ void pc9801_26_device::device_add_mconfig(machine_config &config)
{
SPEAKER(config, "mono").front_center();
YM2203(config, m_opn, 15.9744_MHz_XTAL / 4); // divider not verified
m_opn->irq_handler().set([this] (int state) { m_bus->int_w<5>(state); });
m_opn->port_a_read_callback().set([this] () {
if(BIT(m_joy_sel, 7))
return m_joy[BIT(m_joy_sel, 6)]->read();
return (u8)0xff;
m_opn->irq_handler().set([this] (int state) {
switch(m_int_level & 3)
{
case 0: m_bus->int_w<0>(state); break;
case 1: m_bus->int_w<4>(state); break;
case 2: m_bus->int_w<6>(state); break;
case 3: m_bus->int_w<5>(state); break;
}
});
/*
* xx-- ---- IRSTx interrupt status 0/1
* --xx ---- TRIGx Trigger 1/2
* ---- xxxx <directions>
*/
m_opn->port_a_read_callback().set([this] () {
u8 res = (BIT(m_joy_sel, 7)) ? m_joy[BIT(m_joy_sel, 6)]->read() : 0x3f;
res |= m_int_level << 6;
return (u8)res;
});
/*
* x--- ---- OUTE Output Enable (DDR?)
* -x-- ---- INSL Input Select
* --21 2211 OUTxy x = port / y (2-1) = number (1-3)
*/
m_opn->port_b_write_callback().set([this] (u8 data) {
m_joy_sel = data;
// TODO: guesswork, verify
if (BIT(data, 7))
return;
m_joy[0]->pin_6_w(BIT(~data, 0));
m_joy[0]->pin_7_w(BIT(~data, 1));
m_joy[1]->pin_6_w(BIT(~data, 2));
m_joy[1]->pin_7_w(BIT(~data, 3));
m_joy[0]->pin_8_w(BIT(~data, 4));
m_joy[1]->pin_8_w(BIT(~data, 5));
});
// TODO: verify mixing on HW
@ -86,15 +113,14 @@ const tiny_rom_entry *pc9801_26_device::device_rom_region() const
static INPUT_PORTS_START( pc9801_26 )
// On-board jumpers
// TODO: any way to actually read these from HW?
PORT_START("OPN_JP6A1_JP6A3")
PORT_CONFNAME( 0x03, 0x02, "PC-9801-26: Interrupt level")
PORT_CONFSETTING( 0x00, "IRQ 0" ) // 2-3, 2-3
PORT_CONFSETTING( 0x01, "IRQ 4" ) // 2-3, 1-2
PORT_CONFSETTING( 0x02, "IRQ 5" ) // 1-2, 1-2
PORT_CONFSETTING( 0x03, "IRQ 6" ) // 1-2, 2-3
PORT_START("JP6A1_JP6A3")
PORT_CONFNAME( 0x03, 0x03, "PC-9801-26: Interrupt level")
PORT_CONFSETTING( 0x00, "INT0 (IRQ3)" ) // 2-3, 2-3
PORT_CONFSETTING( 0x02, "INT41 (IRQ10)" ) // 2-3, 1-2
PORT_CONFSETTING( 0x03, "INT5 (IRQ12)" ) // 1-2, 1-2
PORT_CONFSETTING( 0x01, "INT6 (IRQ13)" ) // 1-2, 2-3
PORT_START("OPN_JP6A2")
PORT_START("JP6A2")
PORT_CONFNAME( 0x07, 0x01, "PC-9801-26: Sound ROM address")
PORT_CONFSETTING( 0x00, "0xc8000" ) // 1-10
PORT_CONFSETTING( 0x01, "0xcc000" ) // 2-9
@ -102,7 +128,7 @@ static INPUT_PORTS_START( pc9801_26 )
PORT_CONFSETTING( 0x03, "0xd4000" ) // 4-7
PORT_CONFSETTING( 0x04, "Disable ROM") // 5-6
PORT_START("OPN_JP6A4")
PORT_START("JP6A4")
PORT_CONFNAME( 0x01, 0x01, "PC-9801-26: Port Base" )
PORT_CONFSETTING( 0x00, "0x088" ) // 1-4
PORT_CONFSETTING( 0x01, "0x188" ) // 2-3
@ -115,7 +141,7 @@ ioport_constructor pc9801_26_device::device_input_ports() const
u16 pc9801_26_device::read_io_base()
{
return ((ioport("OPN_JP6A4")->read() & 1) << 8) + 0x0088;
return ((ioport("JP6A4")->read() & 1) << 8) + 0x0088;
}
void pc9801_26_device::device_start()
@ -129,7 +155,7 @@ void pc9801_26_device::device_start()
void pc9801_26_device::device_reset()
{
// install the ROM to the physical program space
u8 rom_setting = ioport("OPN_JP6A2")->read() & 7;
u8 rom_setting = ioport("JP6A2")->read() & 7;
static const u32 rom_addresses[8] = { 0xc8000, 0xcc000, 0xd0000, 0xd4000, 0, 0, 0, 0 };
u32 current_rom = rom_addresses[rom_setting & 7];
memory_region *rom_region = memregion(this->subtag("sound_bios").c_str());
@ -167,9 +193,8 @@ void pc9801_26_device::device_reset()
);
m_io_base = current_io;
// install IRQ line
// static const u8 irq_levels[4] = {0, 4, 5, 6};
// m_irq_level = irq_levels[ioport("OPN_JP6A1_JP6A3")->read() & 3];
// read INT line
m_int_level = m_irq_jp->read() & 3;
}
void pc9801_26_device::device_validity_check(validity_checker &valid) const

2
src/devices/bus/cbus/pc9801_26.h
View File

@ -46,10 +46,12 @@ private:
required_device<pc9801_slot_device> m_bus;
required_device<ym2203_device> m_opn;
required_device_array<msx_general_purpose_port_device, 2U> m_joy;
required_ioport m_irq_jp;
u32 m_rom_base;
u16 m_io_base;
u8 m_joy_sel;
u8 m_int_level;
};