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Merge pull request #5046 from 86Box/tc1995

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Make YMFM work again on 86box using OPL2/3.
This commit is contained in:
Jasmine Iwanek
2024-12-13 16:00:46 -05:00
committed by GitHub
parent 6710b968c0 fd396f7d5b
commit e2866a2909
1 changed files with 9 additions and 5 deletions
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14
src/sound/ymfm/ymfm_fm.ipp
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@@ -1473,11 +1473,14 @@ void fm_engine_base<RegisterType>::assign_operators()
template<class RegisterType>
void fm_engine_base<RegisterType>::update_timer(uint32_t tnum, uint32_t enable, int32_t delta_clocks)
{
uint32_t subtract = !!(tnum >> 15);
tnum &= 0x7fff;
// if the timer is live, but not currently enabled, set the timer
if (enable && !m_timer_running[tnum])
{
// period comes from the registers, and is different for each
uint32_t period = (tnum == 0) ? (1024 - m_regs.timer_a_value()) : 16 * (256 - m_regs.timer_b_value());
uint32_t period = (tnum == 0) ? (1024 - subtract - m_regs.timer_a_value()) : 16 * (256 - subtract - m_regs.timer_b_value());
// caller can also specify a delta to account for other effects
period += delta_clocks;
@@ -1504,8 +1507,6 @@ void fm_engine_base<RegisterType>::update_timer(uint32_t tnum, uint32_t enable,
template<class RegisterType>
void fm_engine_base<RegisterType>::engine_timer_expired(uint32_t tnum)
{
assert(tnum == 0 || tnum == 1);
// update status
if (tnum == 0 && m_regs.enable_timer_a())
set_reset_status(STATUS_TIMERA, 0);
@@ -1521,8 +1522,11 @@ void fm_engine_base<RegisterType>::engine_timer_expired(uint32_t tnum)
m_modified_channels |= 1 << chnum;
}
// reset
m_timer_running[tnum] = false;
// Make sure the array does not go out of bounds to keep gcc happy
if ((tnum < 2) || (sizeof(m_timer_running) > (2 * sizeof(uint8_t)))) {
// reset
m_timer_running[tnum] = false;
}
update_timer(tnum, 1, 0);
}