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i8251a initilization changed (#5825)

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* i8251.cpp: required initial state to enable receiver of a 8251a and also to avoid sending start bit to diserial on reset and get framing error

* eispc_kb.cpp: removed need for scheduler abuse as problem is fixed by correcting the init of the i8251 USART on host side instead

* eispc.cpp: removed an obsolete TODO
This commit is contained in:
Joakim Larsson Edström 2019-10-30 00:27:48 +01:00 committed by ajrhacker
parent cebd828fcd
commit 58c86eb73c
3 changed files with 2 additions and 7 deletions
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2
src/devices/machine/i8251.cpp
View File

@ -67,7 +67,7 @@ i8251_device::i8251_device(
m_syndet_handler(*this),
m_cts(1),
m_dsr(1),
m_rxd(0),
m_rxd(1),
m_rxc(0),
m_txc(0)
{

2
src/mame/drivers/eispc.cpp
View File

@ -996,7 +996,7 @@ INPUT_PORTS_END
ROM_START( epc )
ROM_REGION(0x10000,"bios", 0)
ROM_DEFAULT_BIOS("p860110")
ROM_SYSTEM_BIOS(0, "p840705", "P840705") // TODO: Fix "Keyboard error" for this bios
ROM_SYSTEM_BIOS(0, "p840705", "P840705")
ROMX_LOAD("ericsson_8088.bin", 0xe000, 0x2000, CRC(3953c38d) SHA1(2bfc1f1d11d0da5664c3114994fc7aa3d6dd010d), ROM_BIOS(0))
ROM_SYSTEM_BIOS(1, "p860110", "P860110")
ROMX_LOAD("epcbios1.bin", 0xe000, 0x02000, CRC(79a83706) SHA1(33528c46a24d7f65ef5a860fbed05afcf797fc55), ROM_BIOS(1))

5
src/mame/machine/eispc_kb.cpp
View File

@ -267,23 +267,18 @@ WRITE_LINE_MEMBER(eispc_keyboard_device::hold_w)
m_hold = CLEAR_LINE == state;
}
// TODO: Fix proper HOLD of reset line for MCU until released by hist CPU
WRITE_LINE_MEMBER(eispc_keyboard_device::rst_line_w)
{
if (state == CLEAR_LINE)
{
//m_mcu->resume(SUSPEND_REASON_RESET);
m_mcu->set_input_line(INPUT_LINE_RESET, CLEAR_LINE);
LOGRST("KBD: Keyboard mcu reset line is cleared\n");
}
else
{
// set_input_line suspends with a true argument which causes "Keyboard error"
//m_mcu->suspend(SUSPEND_REASON_RESET, false); // This causes an assert later when DEBUG==1
m_mcu->set_input_line(INPUT_LINE_RESET, ASSERT_LINE);
LOGRST("KBD: Keyboard mcu reset line is asserted\n");
}
}
//-------------------------------------------------