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Midway V Unit linking stub (#5336)

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* minor bugfix and cleanup

* midvunit linking stub

* more likely implementation of m_comm_flags
This commit is contained in:
Risugami 2019-08-02 12:44:38 -05:00 committed by Vas Crabb
parent 5bfb58a6f1
commit 81ddfdc875
2 changed files with 64 additions and 2 deletions
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58
src/mame/drivers/midvunit.cpp
View File

@ -54,6 +54,8 @@ void midvunit_state::machine_start()
save_item(NAME(m_wheel_board_output));
save_item(NAME(m_wheel_board_last));
save_item(NAME(m_wheel_board_u8_latch));
save_item(NAME(m_comm_flags));
save_item(NAME(m_comm_data));
m_optional_drivers.resolve();
}
@ -498,6 +500,58 @@ DECLARE_CUSTOM_INPUT_MEMBER(midvunit_state::motion_r)
}
READ32_MEMBER(midvunit_state::midvunit_intcs_r)
{
return 4;
}
uint16_t midvunit_state::comm_bus_out()
{
uint16_t mask = 0;
if (m_comm_flags & 0x20) // COMCOE
mask |= (m_comm_data >> 4) & 0xf00;
if (m_comm_flags & 0x40) // COMDOE
mask |= 0xff;
return m_comm_data & mask;
}
// To link multiple machines together will require comm_bus_out()
// to be called on each machine and bitwise ORed here.
// This must be done in real time with proper synchronization.
uint16_t midvunit_state::comm_bus_in()
{
return comm_bus_out();
}
READ32_MEMBER(midvunit_state::midvunit_comcs_r)
{
if (offset != 0)
{
logerror("midvunit_comcs_r(%d)\n", offset);
return 0;
}
else
{
uint16_t data = comm_bus_in();
if (m_comm_flags & 0x20) // COMCOE
data &= ~((m_comm_data >> 4) & 0xf00);
if (m_comm_flags & 0x40) // COMDOE
data &= ~0xff;
return data << 16;
}
}
WRITE32_MEMBER(midvunit_state::midvunit_comcs_w)
{
switch (offset)
{
default: logerror("midvunit_comcs_w(%d) = %08X\n", offset, data); break;
case 0: m_comm_data = data >> 16; break;
case 1: m_comm_flags = (data >> 24) & 0xe0; break;
}
}
/*************************************
*
* War Gods I/O ASICs
@ -595,7 +649,7 @@ void midvunit_state::midvunit_map(address_map &map)
map(0x980040, 0x980040).rw(FUNC(midvunit_state::midvunit_page_control_r), FUNC(midvunit_state::midvunit_page_control_w));
map(0x980080, 0x980080).noprw();
map(0x980082, 0x980083).r(FUNC(midvunit_state::midvunit_dma_trigger_r));
map(0x990000, 0x990000).nopr(); // link PAL (low 4 bits must == 4)
map(0x990000, 0x990000).r(FUNC(midvunit_state::midvunit_intcs_r));
map(0x991030, 0x991030).lr16("991030", [this]() { return uint16_t(m_in1->read()); });
// AM_RANGE(0x991050, 0x991050) AM_READONLY // seems to be another port
map(0x991060, 0x991060).r(FUNC(midvunit_state::port0_r));
@ -604,7 +658,7 @@ void midvunit_state::midvunit_map(address_map &map)
map(0x994000, 0x994000).w(FUNC(midvunit_state::midvunit_control_w));
map(0x995000, 0x995000).rw(FUNC(midvunit_state::midvunit_wheel_board_r), FUNC(midvunit_state::midvunit_wheel_board_w));
map(0x995020, 0x995020).w(FUNC(midvunit_state::midvunit_cmos_protect_w));
map(0x997000, 0x997000).noprw(); // communications
map(0x997000, 0x997008).rw(FUNC(midvunit_state::midvunit_comcs_r), FUNC(midvunit_state::midvunit_comcs_w));
map(0x9a0000, 0x9a0000).w(FUNC(midvunit_state::midvunit_sound_w));
map(0x9c0000, 0x9c1fff).rw(FUNC(midvunit_state::midvunit_cmos_r), FUNC(midvunit_state::midvunit_cmos_w)).share("nvram");
map(0x9e0000, 0x9e7fff).ram().w(FUNC(midvunit_state::midvunit_paletteram_w)).share("paletteram");

8
src/mame/includes/midvunit.h
View File

@ -129,6 +129,8 @@ private:
uint8_t m_wheel_board_output;
uint32_t m_wheel_board_last;
uint32_t m_wheel_board_u8_latch;
uint8_t m_comm_flags;
uint16_t m_comm_data;
DECLARE_WRITE32_MEMBER(midvunit_dma_queue_w);
DECLARE_READ32_MEMBER(midvunit_dma_queue_entries_r);
DECLARE_READ32_MEMBER(midvunit_dma_trigger_r);
@ -166,6 +168,9 @@ private:
DECLARE_READ32_MEMBER(generic_speedup_r);
DECLARE_READ32_MEMBER(midvunit_wheel_board_r);
DECLARE_WRITE32_MEMBER(midvunit_wheel_board_w);
DECLARE_READ32_MEMBER(midvunit_intcs_r);
DECLARE_READ32_MEMBER(midvunit_comcs_r);
DECLARE_WRITE32_MEMBER(midvunit_comcs_w);
void set_input(const char *s);
void init_crusnwld_common(offs_t speedup);
void init_crusnusa_common(offs_t speedup);
@ -192,6 +197,9 @@ private:
optional_ioport m_motion;
void postload();
uint16_t comm_bus_out();
uint16_t comm_bus_in();
void midvplus_map(address_map &map);
void midvunit_map(address_map &map);