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I8291 improvements (#3931)

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* i8291: various fixes (nw)

set BO bit only if receiver is ready (NRFD not asserted, fix MJMN bit,
and implement DCAS

* i8291: reset EOI flag when in TIDS (nw)
This commit is contained in:
dxl 2018-08-31 22:07:10 +02:00 committed by R. Belmont
parent 89ae43bfbb
commit 98a50b66ab
1 changed files with 32 additions and 3 deletions
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35
src/devices/machine/i8291a.cpp
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@ -83,6 +83,7 @@ void i8291a_device::device_reset()
update_state(m_dt_state, device_trigger_state::DTIS);
update_state(m_sh_state, source_handshake_state::SIDS);
update_state(m_ah_state, acceptor_handshake_state::AIDS);
update_state(m_lp_state, listener_primary_state::LPIS);
}
void i8291a_device::device_start()
@ -232,7 +233,10 @@ READ8_MEMBER(i8291a_device::spoll_stat_r)
READ8_MEMBER(i8291a_device::addr_stat_r)
{
LOGMASKED(LOG_REG, "%s = %02X\n", __FUNCTION__, m_address_status);
if (!(m_address_status & 0xfe))
m_address_status = 0;
LOGMASKED(LOG_REG, "[%s] %s = %02X\n", machine().describe_context().c_str(), __FUNCTION__, m_address_status);
return m_address_status;
}
@ -516,7 +520,7 @@ void i8291a_device::run_sh_fsm()
m_nba = false;
if (m_t_state == talker_state::TACS || m_t_state == talker_state::SPAS) {
update_state(m_sh_state, source_handshake_state::SGNS);
m_ints1 |= REG_INTS1_BO;
}
break;
@ -526,7 +530,13 @@ void i8291a_device::run_sh_fsm()
if (m_nba) {
update_state(m_sh_state, source_handshake_state::SDYS);
m_ints1 &= ~REG_INTS1_BO;
} else {
if (!m_nrfd)
m_ints1 |= REG_INTS1_BO;
else
m_ints1 &= ~REG_INTS1_BO;
}
break;
case source_handshake_state::SDYS:
@ -567,8 +577,9 @@ void i8291a_device::handle_command()
break;
case IFCMD_SDC:
LOGMASKED(LOG_CMD, "SDC\n");
if (m_l_state == listener_state::LADS)
if (m_l_state == listener_state::LADS) {
update_state(m_dc_state, device_clear_state::DCAS);
}
break;
case IFCMD_GET:
LOGMASKED(LOG_CMD, "GET\n");
@ -654,6 +665,8 @@ void i8291a_device::handle_command()
update_state(m_tp_state, talker_primary_state::TPAS);
if ((m_address_mode & 3) == 1 && m_t_state == talker_state::TIDS)
update_state(m_t_state, talker_state::TADS);
if ((m_address_mode & 3) == 3)
update_state(m_t_state, talker_state::TIDS);
} else {
update_state(m_tp_state, talker_primary_state::TPIS);
update_state(m_t_state, talker_state::TIDS);
@ -753,6 +766,7 @@ void i8291a_device::run_t_fsm()
{
switch (m_t_state) {
case talker_state::TIDS:
m_send_eoi = false;
m_address_status &= ~REG_ADDRESS_STATUS_TA;
break;
@ -830,7 +844,22 @@ void i8291a_device::run_dc_fsm()
break;
case device_clear_state::DCAS:
m_ints1 |= REG_INTS1_DEC;
update_int();
update_state(m_t_state, talker_state::TIDS);
update_state(m_tp_state, talker_primary_state::TPIS);
update_state(m_tsp_state, talker_serial_poll_state::SPIS);
update_state(m_l_state, listener_state::LIDS);
update_state(m_rl_state, remote_local_state::LOCS);
update_state(m_pp_state, parallel_poll_state::PPIS);
update_state(m_dc_state, device_clear_state::DCIS);
update_state(m_dt_state, device_trigger_state::DTIS);
update_state(m_sh_state, source_handshake_state::SIDS);
update_state(m_ah_state, acceptor_handshake_state::AIDS);
update_state(m_lp_state, listener_primary_state::LPIS);
m_ints1 |= REG_INTS1_DEC;
update_int();
break;
}
}