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z8536: Better daisy chain support, fix port assignment when writing data

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This commit is contained in:
Dirk Best 2021-08-04 13:04:00 +02:00
parent 57e4628edc
commit 68dbd42a24
2 changed files with 30 additions and 5 deletions
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34
src/devices/machine/z8536.cpp
View File

@ -919,6 +919,32 @@ void cio_base_device::device_timer(emu_timer &timer, device_timer_id id, int par
int z8536_device::z80daisy_irq_state()
{
static const int prio[] =
{
COUNTER_TIMER_3_COMMAND_AND_STATUS,
PORT_A_COMMAND_AND_STATUS,
COUNTER_TIMER_2_COMMAND_AND_STATUS,
PORT_B_COMMAND_AND_STATUS,
COUNTER_TIMER_1_COMMAND_AND_STATUS
};
if (m_register[MASTER_INTERRUPT_CONTROL] & MICR_MIE)
{
for (int i = 0; i < 5; i++)
{
if (m_register[prio[i]] & PCS_IUS)
{
// we are currently servicing an interrupt request
return Z80_DAISY_IEO;
}
else if ((m_register[prio[i]] & PCS_IE) && (m_register[prio[i]] & PCS_IP))
{
// indicate that we have an interrupt request waiting
return Z80_DAISY_INT;
}
}
}
return 0;
}
@ -1081,19 +1107,19 @@ void z8536_device::write(offs_t offset, u8 data)
{
switch (offset & 0x03)
{
case PORT_C:
case 0:
write_register(PORT_C_DATA, data);
break;
case PORT_B:
case 1:
write_register(PORT_B_DATA, data);
break;
case PORT_A:
case 2:
write_register(PORT_A_DATA, data);
break;
case CONTROL:
case 3:
if (m_state0)
{
// state 0: write pointer

1
src/devices/machine/z8536.h
View File

@ -381,7 +381,6 @@ protected:
void match_pattern(int port);
void external_port_w(int port, int bit, int state);
private:
devcb_write_line m_write_irq;
devcb_read8 m_read_pa;