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tms9901: Ensure that the INT3 input is disabled when the clock is enabled.

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This commit is contained in:
Michael Zapf 2019-05-15 23:07:24 +02:00
parent 13c3ec0f00
commit 6d44504899
1 changed files with 11 additions and 4 deletions
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11
src/devices/machine/tms9901.cpp
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@ -188,12 +188,19 @@ void tms9901_device::prioritize_interrupts()
// Skip the rightmost bit // Skip the rightmost bit
uint16_t masked_ints = m_int_line; uint16_t masked_ints = m_int_line;
// Do we have a timer interrupt? // Is the clock enabled?
if (m_clock_register != 0 && m_timer_int_pending) if (m_clock_register != 0)
{
// Disable the actual INT3* input
masked_ints &= ~(1<<INT3);
// Do we have a clock interrupt?
if (m_timer_int_pending)
{ {
masked_ints |= (1<<INT3); masked_ints |= (1<<INT3);
LOGMASKED(LOG_INT, "INT3 (timer) asserted\n"); LOGMASKED(LOG_INT, "INT3 (timer) asserted\n");
} }
}
m_int_level = 1; m_int_level = 1;
masked_ints = (masked_ints & m_int_mask)>>1; masked_ints = (masked_ints & m_int_mask)>>1;