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ins8250: be a bit more careful (nw)

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cracyc 2016-07-26 12:03:49 -05:00
parent cbdaff6da2
commit 9333b66ddc
1 changed files with 1 additions and 1 deletions
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2
src/devices/machine/ins8250.cpp
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@ -235,7 +235,7 @@ WRITE8_MEMBER( ins8250_uart_device::ins8250_w )
} }
else else
{ {
if (m_regs.lsr & 0x20) if ((m_regs.lsr & 0x20) && (data & COM_INT_PENDING_TRANSMITTER_HOLDING_REGISTER_EMPTY))
trigger_int(COM_INT_PENDING_TRANSMITTER_HOLDING_REGISTER_EMPTY); trigger_int(COM_INT_PENDING_TRANSMITTER_HOLDING_REGISTER_EMPTY);
m_regs.ier = data; m_regs.ier = data;
update_interrupt(); update_interrupt();