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ymfm: Don't pre-mask status bits with the status mask; apply instead at time of consumption. Fixes missing music in kickball.

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This commit is contained in:
Aaron Giles 2021-04-04 15:08:37 -07:00
parent 47e9aa7d6b
commit 17e0ffb32b
2 changed files with 5 additions and 5 deletions
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4
src/devices/sound/ymfm.cpp
View File

@ -3103,7 +3103,7 @@ void ymfm_engine_base<RegisterType>::write(u16 regnum, u8 data)
template<class RegisterType>
u8 ymfm_engine_base<RegisterType>::status() const
{
u8 result = m_status & ~STATUS_BUSY;
u8 result = m_status & ~STATUS_BUSY & ~m_regs.status_mask();
if (m_device.machine().time() < m_busy_end)
result |= STATUS_BUSY;
return result;
@ -3210,7 +3210,7 @@ TIMER_CALLBACK_MEMBER(ymfm_engine_base<RegisterType>::check_interrupts)
{
// update the state
u8 old_state = m_irq_state;
m_irq_state = ((m_status & m_irq_mask) != 0);
m_irq_state = ((m_status & m_irq_mask & ~m_regs.status_mask()) != 0);
// set the IRQ status bit
if (m_irq_state)

6
src/devices/sound/ymfm.h
View File

@ -801,8 +801,8 @@ public:
u32 irq_reset() const { return byte(0x04, 7, 1); }
u32 reset_timer_b() const { return byte(0x04, 7, 1) | byte(0x04, 5, 1); }
u32 reset_timer_a() const { return byte(0x04, 7, 1) | byte(0x04, 6, 1); }
u32 enable_timer_b() const { return byte(0x04, 5, 1) ^ 1; }
u32 enable_timer_a() const { return byte(0x04, 6, 1) ^ 1; }
u32 enable_timer_b() const { return 1; }
u32 enable_timer_a() const { return 1; }
u32 load_timer_b() const { return byte(0x04, 1, 1); }
u32 load_timer_a() const { return byte(0x04, 0, 1); }
u32 csm() const { return IsOpl3Plus ? 0 : byte(0x08, 7, 1); }
@ -1300,7 +1300,7 @@ public:
// set/reset bits in the status register, updating the IRQ status
u8 set_reset_status(u8 set, u8 reset)
{
m_status = (m_status | set) & ~reset & ~m_regs.status_mask();
m_status = (m_status | set) & ~reset;
schedule_check_interrupts();
return m_status;
}