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a2mockingboard.cpp: Updates [R. Belmont, TomCh]

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- Mirror the VIAs correctly across the whole CnXX range
- Actually write the inflection bits for the SC-01
This commit is contained in:
arbee 2021-04-01 22:16:08 -04:00
parent 289efafb39
commit 68b16c6f51
1 changed files with 41 additions and 9 deletions
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50
src/devices/bus/a2bus/a2mockingboard.cpp
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@ -2,7 +2,7 @@
// copyright-holders:R. Belmont
/*********************************************************************
a2mockingboard.c
a2mockingboard.cpp
Implementation of the Sweet Micro Systems Mockingboard card
and friends.
@ -167,10 +167,14 @@ void a2bus_ayboard_device::device_reset()
uint8_t a2bus_ayboard_device::read_cnxx(uint8_t offset)
{
if (offset <= 0x10)
if (offset <= 0x7f)
{
return m_via1->read(offset & 0xf);
else if (offset >= 0x80 && offset <= 0x90)
}
else
{
return m_via2->read(offset & 0xf);
}
return 0;
}
@ -181,17 +185,24 @@ uint8_t a2bus_phasor_device::read_cnxx(uint8_t offset)
int via_sel;
if (m_native)
{
via_sel = ((offset & 0x80) >> 6) | ((offset & 0x10) >> 4);
}
else
{
via_sel = (offset & 0x80) ? 2 : 1;
}
if ((offset <= 0x20) || (offset >= 0x80 && offset <= 0xa0))
{
if (BIT(via_sel, 0))
{
ret |= m_via1->read(offset & 0xf);
}
if (BIT(via_sel, 1))
{
ret |= m_via2->read(offset & 0xf);
}
}
return ret;
@ -203,12 +214,17 @@ uint8_t a2bus_phasor_device::read_cnxx(uint8_t offset)
void a2bus_ayboard_device::write_cnxx(uint8_t offset, uint8_t data)
{
if (offset <= 0x10)
// When the SSI-263 is emulated, Cn40 will write to both the VIA and
// the first SSI-263, and Cn20 will write to both the VIA and the
// second SSI-263. Reads only select the VIA.
if (offset <= 0x7f)
{
m_via1->write(offset & 0xf, data);
else if (offset >= 0x80 && offset <= 0x90)
m_via2->write(offset & 0xf, data);
}
else
logerror("Mockingboard(%d): unk write %02x to Cn%02X (%s)\n", slotno(), data, offset, machine().describe_context());
{
m_via2->write(offset & 0xf, data);
}
}
void a2bus_phasor_device::write_cnxx(uint8_t offset, uint8_t data)
@ -218,32 +234,47 @@ void a2bus_phasor_device::write_cnxx(uint8_t offset, uint8_t data)
int via_sel;
if (m_native)
{
via_sel = ((offset & 0x80) >> 6) | ((offset & 0x10) >> 4);
}
else
{
via_sel = (offset & 0x80) ? 2 : 1;
}
if (BIT(via_sel, 0))
{
m_via1->write(offset & 0xf, data);
}
if (BIT(via_sel, 1))
{
m_via2->write(offset & 0xf, data);
}
}
}
WRITE_LINE_MEMBER( a2bus_ayboard_device::via1_irq_w )
{
if (state)
{
raise_slot_irq();
}
else
{
lower_slot_irq();
}
}
WRITE_LINE_MEMBER( a2bus_ayboard_device::via2_irq_w )
{
if (state)
{
raise_slot_irq();
}
else
{
lower_slot_irq();
}
}
void a2bus_ayboard_device::via1_out_a(uint8_t data)
@ -477,6 +508,7 @@ WRITE_LINE_MEMBER( a2bus_mockingboard_device::write_via1_cb2 )
if ((state == CLEAR_LINE) && (m_last_cb2_state == ASSERT_LINE))
{
m_sc01->write(m_portb1);
m_sc01->inflection_w(m_portb1 >> 6);
}
m_last_cb2_state = state;
}