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fix for timers 8237dma, this gives timeslice to cpu making soundblaster able to work (no whatsnew)

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This commit is contained in:
Miodrag Milanovic 2012-06-01 14:01:03 +00:00
parent f0471ad2d0
commit 2fe09fc618
1 changed files with 20 additions and 5 deletions
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25
src/emu/machine/8237dma.c
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@ -304,7 +304,8 @@ void i8237_device::i8237_timerproc()
m_out_hrq_func(m_hrq);
m_state = DMA8237_S0;
m_timer->enable( true );
//m_timer->enable( true );
m_timer->adjust(attotime::from_hz(clock()), 0, attotime::from_hz(clock()));
}
else if (m_command == 3 && (m_drq & 1))
{
@ -314,7 +315,8 @@ void i8237_device::i8237_timerproc()
}
else
{
m_timer->enable( false );
//m_timer->enable( false );
m_timer->reset();
}
break;
}
@ -607,7 +609,11 @@ WRITE8_DEVICE_HANDLER_TRAMPOLINE(i8237, i8237_w)
case 8:
/* DMA command register */
m_command = data;
m_timer->enable( ( m_command & 0x04 ) ? 0 : 1 );
// m_timer->enable( ( m_command & 0x04 ) ? 0 : 1 );
if ( m_command & 0x04 )
m_timer->reset();
else
m_timer->adjust(attotime::from_hz(clock()), 0, attotime::from_hz(clock()));
break;
case 9:
@ -617,7 +623,12 @@ WRITE8_DEVICE_HANDLER_TRAMPOLINE(i8237, i8237_w)
if ( data & 0x04 )
{
m_drq |= 0x01 << channel;
m_timer->enable( ( m_command & 0x04 ) ? 0 : 1 );
//m_timer->enable( ( m_command & 0x04 ) ? 0 : 1 );
if ( m_command & 0x04 )
m_timer->reset();
else
m_timer->adjust(attotime::from_hz(clock()), 0, attotime::from_hz(clock()));
}
else
{
@ -692,7 +703,11 @@ void i8237_device::i8237_drq_write(int channel, int state)
m_drq &= ~( 0x01 << channel );
}
m_timer->enable( ( m_command & 0x04 ) ? 0 : 1 );
//m_timer->enable( ( m_command & 0x04 ) ? 0 : 1 );
if ( m_command & 0x04 )
m_timer->reset();
else
m_timer->adjust(attotime::from_hz(clock()), 0, attotime::from_hz(clock()));
}