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intchess: test 6502 nmi edge-trigger bug (remove || 1 and it works)

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This commit is contained in:
hap 2020-07-17 10:07:34 +02:00
parent e15b21023b
commit a31bf42d43
1 changed files with 9 additions and 2 deletions
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11
src/mame/drivers/saitek_intchess.cpp
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@ -192,7 +192,7 @@ void intchess_state::control_w(u8 data)
// PB5: speaker
m_dac->write(BIT(data, 5));
// PB6: cassette input?
// PB6: ?
// PB7: cassette output
m_cass->output(BIT(data, 7) ? +1.0 : -1.0);
}
@ -205,7 +205,14 @@ u8 intchess_state::control_r()
TIMER_DEVICE_CALLBACK_MEMBER(intchess_state::cass_input)
{
m_via->write_pb6((m_cass->input() > +0.04) ? 1 : 0);
static bool nmistate = false;
bool state = m_cass->input() < -0.04;
if (state != nmistate || 1)
{
m_maincpu->set_input_line(INPUT_LINE_NMI, state ? ASSERT_LINE : CLEAR_LINE);
nmistate = state;
}
}