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cpu/upd7810/upd7810.cpp: Improve uPD7801 Mode C handling. (#12914)

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Fixes banking in SCV Star Speeder.
This commit is contained in:
wilbertpol 2024-10-26 22:31:47 +01:00 committed by GitHub
parent 99634a7e33
commit fe7e897e56
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GPG Key ID: B5690EEEBB952194
3 changed files with 82 additions and 38 deletions
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111
src/devices/cpu/upd7810/upd7810.cpp
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@ -623,25 +623,7 @@ uint8_t upd7810_device::RP(offs_t port)
data = (m_pb_in & m_mb) | (m_pb_out & ~m_mb);
break;
case UPD7810_PORTC:
if (m_mc && !m_pc_in_cb.isunset()) // NS20031301 no need to read if the port is set as output
m_pc_in = m_pc_in_cb(0, m_mc);
data = (m_pc_in & m_mc) | (m_pc_out & ~m_mc);
if (m_mcc & 0x01) /* PC0 = TxD output */
data = (data & ~0x01) | (m_txd & 1 ? 0x01 : 0x00);
if (m_mcc & 0x02) /* PC1 = RxD input */
data = (data & ~0x02) | (m_rxd & 1 ? 0x02 : 0x00);
if (m_mcc & 0x04) /* PC2 = SCK input/output */
data = (data & ~0x04) | (m_sck & 1 ? 0x04 : 0x00);
if (m_mcc & 0x08) /* PC3 = TI/INT2 input */
data = (data & ~0x08) | (m_int2 & 1 ? 0x08 : 0x00);
if (m_mcc & 0x10) /* PC4 = TO output */
data = (data & ~0x10) | (m_to & 1 ? 0x10 : 0x00);
if (m_mcc & 0x20) /* PC5 = CI input */
data = (data & ~0x20) | (m_ci & 1 ? 0x20 : 0x00);
if (m_mcc & 0x40) /* PC6 = CO0 output */
data = (data & ~0x40) | (m_co0 & 1 ? 0x40 : 0x00);
if (m_mcc & 0x80) /* PC7 = CO1 output */
data = (data & ~0x80) | (m_co1 & 1 ? 0x80 : 0x00);
data = read_pc();
break;
case UPD7810_PORTD:
if (!m_pd_in_cb.isunset())
@ -689,6 +671,42 @@ uint8_t upd7810_device::RP(offs_t port)
return data;
}
uint8_t upd7810_device::read_pc()
{
if (m_mc && !m_pc_in_cb.isunset()) // NS20031301 no need to read if the port is set as output
m_pc_in = m_pc_in_cb(0, m_mc);
uint8_t data = (m_pc_in & m_mc) | (m_pc_out & ~m_mc);
if (m_mcc & 0x01) /* PC0 = TxD output */
data = (data & ~0x01) | (m_txd & 1 ? 0x01 : 0x00);
if (m_mcc & 0x02) /* PC1 = RxD input */
data = (data & ~0x02) | (m_rxd & 1 ? 0x02 : 0x00);
if (m_mcc & 0x04) /* PC2 = SCK input/output */
data = (data & ~0x04) | (m_sck & 1 ? 0x04 : 0x00);
if (m_mcc & 0x08) /* PC3 = TI/INT2 input */
data = (data & ~0x08) | (m_int2 & 1 ? 0x08 : 0x00);
if (m_mcc & 0x10) /* PC4 = TO output */
data = (data & ~0x10) | (m_to & 1 ? 0x10 : 0x00);
if (m_mcc & 0x20) /* PC5 = CI input */
data = (data & ~0x20) | (m_ci & 1 ? 0x20 : 0x00);
if (m_mcc & 0x40) /* PC6 = CO0 output */
data = (data & ~0x40) | (m_co0 & 1 ? 0x40 : 0x00);
if (m_mcc & 0x80) /* PC7 = CO1 output */
data = (data & ~0x80) | (m_co1 & 1 ? 0x80 : 0x00);
return data;
}
uint8_t upd7801_device::read_pc()
{
if ((m_mc & 0x87) && !m_pc_in_cb.isunset()) // NS20031301 no need to read if the port is set as output
m_pc_in = m_pc_in_cb(0, 0x84 | (m_mc & 0x03));
uint8_t data = (m_pc_in & 0x87) | (m_pc_out & ~0x87);
if (!BIT(m_mc, 2)) /* TODO PC2 = -SCS input */
data = (data & ~0x04) | 0x04;
if (!BIT(m_mc, 7)) /* TODO PC7 = HOLD input */
data = (data & ~0x80);
return data;
}
void upd7810_device::WP(offs_t port, uint8_t data)
{
switch (port)
@ -705,24 +723,7 @@ void upd7810_device::WP(offs_t port, uint8_t data)
break;
case UPD7810_PORTC:
m_pc_out = data;
data = (data & ~m_mc) | (m_pc_pullups & m_mc);
if (m_mcc & 0x01) /* PC0 = TxD output */
data = (data & ~0x01) | (m_txd & 1 ? 0x01 : 0x00);
if (m_mcc & 0x02) /* PC1 = RxD input */
data = (data & ~0x02) | (m_rxd & 1 ? 0x02 : 0x00);
if (m_mcc & 0x04) /* PC2 = SCK input/output */
data = (data & ~0x04) | (m_sck & 1 ? 0x04 : 0x00);
if (m_mcc & 0x08) /* PC3 = TI/INT2 input */
data = (data & ~0x08) | (m_int2 & 1 ? 0x08 : 0x00);
if (m_mcc & 0x10) /* PC4 = TO output */
data = (data & ~0x10) | (m_to & 1 ? 0x10 : 0x00);
if (m_mcc & 0x20) /* PC5 = CI input */
data = (data & ~0x20) | (m_ci & 1 ? 0x20 : 0x00);
if (m_mcc & 0x40) /* PC6 = CO0 output */
data = (data & ~0x40) | (m_co0 & 1 ? 0x40 : 0x00);
if (m_mcc & 0x80) /* PC7 = CO1 output */
data = (data & ~0x80) | (m_co1 & 1 ? 0x80 : 0x00);
m_pc_out_cb(data);
write_pc(data);
break;
case UPD7810_PORTD:
m_pd_out = data;
@ -763,6 +764,42 @@ void upd7810_device::WP(offs_t port, uint8_t data)
}
}
void upd7810_device::write_pc(uint8_t data)
{
data = (data & ~m_mc) | (m_pc_pullups & m_mc);
if (m_mcc & 0x01) /* PC0 = TxD output */
data = (data & ~0x01) | (m_txd & 1 ? 0x01 : 0x00);
if (m_mcc & 0x02) /* PC1 = RxD input */
data = (data & ~0x02) | (m_rxd & 1 ? 0x02 : 0x00);
if (m_mcc & 0x04) /* PC2 = SCK input/output */
data = (data & ~0x04) | (m_sck & 1 ? 0x04 : 0x00);
if (m_mcc & 0x08) /* PC3 = TI/INT2 input */
data = (data & ~0x08) | (m_int2 & 1 ? 0x08 : 0x00);
if (m_mcc & 0x10) /* PC4 = TO output */
data = (data & ~0x10) | (m_to & 1 ? 0x10 : 0x00);
if (m_mcc & 0x20) /* PC5 = CI input */
data = (data & ~0x20) | (m_ci & 1 ? 0x20 : 0x00);
if (m_mcc & 0x40) /* PC6 = CO0 output */
data = (data & ~0x40) | (m_co0 & 1 ? 0x40 : 0x00);
if (m_mcc & 0x80) /* PC7 = CO1 output */
data = (data & ~0x80) | (m_co1 & 1 ? 0x80 : 0x00);
m_pc_out_cb(data);
}
void upd7801_device::write_pc(uint8_t data)
{
data = (data & 0x78) | (m_pc_pullups & ~0x78);
if (!BIT(m_mc, 3)) /* TODO PC3 = SAK output */
data = (data & ~0x08);
if (!BIT(m_mc, 4)) /* PC4 = TO output */
data = (data & ~0x10) | (m_to & 1 ? 0x10 : 0x00);
if (!BIT(m_mc, 5)) /* TODO PC5 = IO/-M input */
data = (data & ~0x20);
if (!BIT(m_mc, 6)) /* TODO PC6 = HLDA output */
data = (data & ~0x40);
m_pc_out_cb(data);
}
void upd7810_device::upd7810_take_irq()
{
uint16_t vector = 0;

4
src/devices/cpu/upd7810/upd7810.h
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@ -199,6 +199,8 @@ protected:
};
virtual void configure_ops();
virtual uint8_t read_pc();
virtual void write_pc(uint8_t data);
static const struct opcode_s s_op48[256];
static const struct opcode_s s_op4C[256];
@ -1410,6 +1412,8 @@ protected:
virtual void handle_timers(int cycles) override;
virtual void upd7810_take_irq() override;
virtual void configure_ops() override;
virtual uint8_t read_pc() override;
virtual void write_pc(uint8_t data) override;
};

5
src/devices/cpu/upd7810/upd7810_opcodes.cpp
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@ -9474,5 +9474,8 @@ void upd7810_device::MOV_MC_A_7801()
/* PC5 Output IO/-M Output */
/* PC6 Output HLDA Output */
/* PC7 Input HOLD Input */
MC = 0x84 | ( ( A & 0x02 ) ? 0x02 : 0x00 ) | ( ( A & 0x01 ) ? 0x01 : 0x00 );
if (MC == A)
return;
MC = A;
WP(UPD7810_PORTC, m_pc_out);
}