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-dpb7000: Added TV field timer. [Ryan Holtz]

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This commit is contained in:
mooglyguy 2019-06-05 17:31:58 +02:00 committed by MooglyGuy
parent 153c0ab9ca
commit 5a4df14bb1
1 changed files with 17 additions and 2 deletions
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19
src/mame/drivers/dpb7000.cpp
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@ -53,6 +53,8 @@ private:
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
static constexpr device_timer_id TIMER_DISKSEQ = 0;
static constexpr device_timer_id TIMER_FIELD_IN = 1;
static constexpr device_timer_id TIMER_FIELD_OUT = 1;
DECLARE_READ16_MEMBER(bus_error_r);
DECLARE_WRITE16_MEMBER(bus_error_w);
@ -102,6 +104,8 @@ private:
required_memory_region m_diskseq_prom;
emu_timer *m_diskseq_clk;
emu_timer *m_field_in_clk;
emu_timer *m_field_out_clk;
enum : uint8_t
{
@ -309,6 +313,13 @@ void dpb7000_state::machine_start()
save_item(NAME(m_diskseq_cc_inputs));
m_diskseq_clk = timer_alloc(TIMER_DISKSEQ);
m_diskseq_clk->adjust(attotime::never);
m_field_in_clk = timer_alloc(TIMER_FIELD_IN);
m_field_in_clk->adjust(attotime::never);
m_field_out_clk = timer_alloc(TIMER_FIELD_IN);
m_field_out_clk->adjust(attotime::never);
}
void dpb7000_state::machine_reset()
@ -329,14 +340,18 @@ void dpb7000_state::machine_reset()
memset(m_diskseq_cc_inputs, 0, 4);
m_diskseq_clk->adjust(attotime::from_hz(1000000), 0, attotime::from_hz(1000000));
m_field_in_clk->adjust(attotime::from_hz(59.94), 0, attotime::from_hz(59.94));
m_field_out_clk->adjust(attotime::from_hz(59.94) + attotime::from_hz(15734.0 / 9.0), 0, attotime::from_hz(59.94));
}
void dpb7000_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
if (id == TIMER_DISKSEQ)
{
diskseq_tick();
}
else if (id == TIMER_FIELD_IN)
req_a_w(1);
else if (id == TIMER_FIELD_OUT)
req_a_w(0);
}
MC6845_UPDATE_ROW(dpb7000_state::crtc_update_row)