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z80dart.c:

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- The channel B modified interrupt vector can be read immediately after setting it.
- Reading from a read register other than 0 also masks out the register index.  [Wilbert Pol]
This commit is contained in:
Wilbert Pol 2010-12-26 08:19:09 +00:00
parent 13f8dfdcb1
commit c8d7056b48
1 changed files with 9 additions and 0 deletions
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9
src/emu/machine/z80dart.c
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@ -995,6 +995,12 @@ UINT8 z80dart_device::dart_channel::control_read()
int reg = m_wr[0] & WR0_REGISTER_MASK; int reg = m_wr[0] & WR0_REGISTER_MASK;
if (reg != 0)
{
// mask out register index
m_wr[0] &= ~WR0_REGISTER_MASK;
}
switch (reg) switch (reg)
{ {
case 0: case 0:
@ -1125,6 +1131,9 @@ void z80dart_device::dart_channel::control_write(UINT8 data)
case 2: case 2:
// interrupt vector // interrupt vector
if (m_index == CHANNEL_B)
m_rr[2] = ( m_rr[2] & 0x0e ) | ( m_wr[2] & 0xF1);;
m_device->check_interrupts(); m_device->check_interrupts();
LOG(("Z80DART \"%s\" Channel %c : Interrupt Vector %02x\n", m_device->tag(), 'A' + m_index, data)); LOG(("Z80DART \"%s\" Channel %c : Interrupt Vector %02x\n", m_device->tag(), 'A' + m_index, data));
break; break;