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z80dart: Miscellaneous bug fixes

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- Default RXD to 1 to eliminate spurious break condition
- Correct CTS level in RR0 after "Reset External/Status Interrupt" command
- Allow immediate inactivation of RTS output when nothing is being transmitted
This commit is contained in:
AJR 2018-09-16 09:44:51 -04:00
parent 77fd560d0f
commit 8be6a48629
1 changed files with 4 additions and 2 deletions
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6
src/devices/machine/z80dart.cpp
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@ -467,7 +467,7 @@ z80dart_channel::z80dart_channel(const machine_config &mconfig, const char *tag,
, m_rx_first(0) , m_rx_first(0)
, m_rx_break(0) , m_rx_break(0)
, m_rx_rr0_latch(0) , m_rx_rr0_latch(0)
, m_rxd(0) , m_rxd(1)
, m_ri(0) , m_ri(0)
, m_cts(0) , m_cts(0)
, m_dcd(0) , m_dcd(0)
@ -802,7 +802,7 @@ void z80dart_channel::control_write(uint8_t data)
if (!m_dcd) m_rr[0] |= RR0_DCD; if (!m_dcd) m_rr[0] |= RR0_DCD;
if (m_ri) m_rr[0] |= RR0_RI; if (m_ri) m_rr[0] |= RR0_RI;
if (m_cts) m_rr[0] |= RR0_CTS; if (!m_cts) m_rr[0] |= RR0_CTS;
m_rx_rr0_latch = 0; m_rx_rr0_latch = 0;
@ -932,6 +932,8 @@ void z80dart_channel::control_write(uint8_t data)
else else
{ {
// when the RTS bit is reset, the _RTS output goes high after the transmitter empties // when the RTS bit is reset, the _RTS output goes high after the transmitter empties
if (m_rr[1] & RR1_ALL_SENT)
set_rts(1);
m_rts = 0; m_rts = 0;
} }