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tms9914: latch EOI flag until next byte is sent

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hp9000/300 sends FEOI directly after the data register write,
before the byte is actually transmitted. This leads to the current
byte being sent out with EOI set, instead of the last one.
This commit is contained in:
Sven Schnelle 2018-10-10 23:04:09 +02:00
parent 6bf0934a2d
commit 2fa61e9d60
2 changed files with 16 additions and 8 deletions
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23
src/devices/machine/tms9914.cpp
View File

@ -285,6 +285,19 @@ WRITE8_MEMBER(tms9914_device::reg8_w)
case REG_W_DO:
m_reg_do = data;
if (m_next_eoi) {
m_next_eoi = false;
if (!m_swrst) {
if (m_t_eoi_state == FSM_T_ENIS) {
m_t_eoi_state = FSM_T_ENRS;
} else if (m_t_eoi_state == FSM_T_ENAS) {
m_t_eoi_state = FSM_T_ERAS;
}
}
}
set_accrq(false);
if (!m_swrst) {
BIT_CLR(m_reg_int0_status , REG_INT0_BO_BIT);
@ -1131,6 +1144,7 @@ void tms9914_device::if_cmd_received(uint8_t if_cmd)
void tms9914_device::dab_received(uint8_t dab , bool eoi)
{
LOG("%.6f RX DAB:%02x/%d\n" , machine().time().as_double() , dab , eoi);
m_reg_di = dab;
if (!m_shdw) {
m_ah_anhs = true;
set_int0_bit(REG_INT0_BI_BIT);
@ -1141,7 +1155,6 @@ void tms9914_device::dab_received(uint8_t dab , bool eoi)
if (m_hdfe && eoi) {
m_ah_aehs = true;
}
m_reg_di = dab;
}
void tms9914_device::do_aux_cmd(unsigned cmd , bool set_bit)
@ -1219,13 +1232,7 @@ void tms9914_device::do_aux_cmd(unsigned cmd , bool set_bit)
break;
case AUXCMD_FEOI:
if (!m_swrst) {
if (m_t_eoi_state == FSM_T_ENIS) {
m_t_eoi_state = FSM_T_ENRS;
} else if (m_t_eoi_state == FSM_T_ENAS) {
m_t_eoi_state = FSM_T_ERAS;
}
}
m_next_eoi = true;
break;
case AUXCMD_LON:

1
src/devices/machine/tms9914.h
View File

@ -303,6 +303,7 @@ private:
void update_ifc();
void update_ren();
void set_accrq(bool state);
bool m_next_eoi;
};
// device type definition