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[PIT8253] Update PIT counter even if there was no elapsed cycles (this only affects fast drivers like at586 in MESS)

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This commit is contained in:
Miodrag Milanovic 2010-01-04 13:05:45 +00:00
parent 200b21dff7
commit bd0c65cb91
1 changed files with 10 additions and 10 deletions
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20
src/emu/machine/pit8253.c
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@ -266,10 +266,10 @@ static void simulate2(const device_config *device, struct pit8253_timer *timer,
} }
else else
{ {
if (elapsed_cycles > 0 && timer->phase == 1) if (elapsed_cycles >= 0 && timer->phase == 1)
{ {
/* Counter load cycle */ /* Counter load cycle */
--elapsed_cycles; if (elapsed_cycles > 0) --elapsed_cycles;
timer->phase = 2; timer->phase = 2;
load_counter_value( device, timer ); load_counter_value( device, timer );
} }
@ -327,10 +327,10 @@ static void simulate2(const device_config *device, struct pit8253_timer *timer,
Gate rising-edge sensitive only. Gate rising-edge sensitive only.
Rising edge initiates counting and resets output after next clock. */ Rising edge initiates counting and resets output after next clock. */
if ( elapsed_cycles > 0 && timer->phase == 1 ) if ( elapsed_cycles >= 0 && timer->phase == 1 )
{ {
/* Counter load cycle, output goes low */ /* Counter load cycle, output goes low */
--elapsed_cycles; if (elapsed_cycles > 0) --elapsed_cycles;
timer->phase = 2; timer->phase = 2;
load_counter_value( device, timer ); load_counter_value( device, timer );
set_output( device, timer, 0 ); set_output( device, timer, 0 );
@ -391,9 +391,9 @@ static void simulate2(const device_config *device, struct pit8253_timer *timer,
} }
else else
{ {
if ( elapsed_cycles > 0 && timer->phase == 1 ) if ( elapsed_cycles >= 0 && timer->phase == 1 )
{ {
--elapsed_cycles; if (elapsed_cycles > 0) --elapsed_cycles;
timer->phase = 2; timer->phase = 2;
load_counter_value( device, timer ); load_counter_value( device, timer );
} }
@ -412,10 +412,10 @@ static void simulate2(const device_config *device, struct pit8253_timer *timer,
} }
} }
if ( elapsed_cycles > 0 && timer->phase == 3 ) if ( elapsed_cycles >= 0 && timer->phase == 3 )
{ {
/* Reload counter, output goes high */ /* Reload counter, output goes high */
--elapsed_cycles; if (elapsed_cycles > 0) --elapsed_cycles;
timer->phase = 2; timer->phase = 2;
load_counter_value( device, timer ); load_counter_value( device, timer );
adjusted_value = adjusted_count( bcd, timer->value ); adjusted_value = adjusted_count( bcd, timer->value );
@ -468,7 +468,7 @@ static void simulate2(const device_config *device, struct pit8253_timer *timer,
} }
else else
{ {
if ( elapsed_cycles > 0 && timer->phase == 1 ) if ( elapsed_cycles >= 0 && timer->phase == 1 )
{ {
--elapsed_cycles; --elapsed_cycles;
timer->phase = 2; timer->phase = 2;
@ -546,7 +546,7 @@ static void simulate2(const device_config *device, struct pit8253_timer *timer,
} }
else else
{ {
if (elapsed_cycles > 0 && timer->phase == 1) if (elapsed_cycles >= 0 && timer->phase == 1)
{ {
--elapsed_cycles; --elapsed_cycles;
timer->phase = 2; timer->phase = 2;