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-rw-r--r--src/mame/drivers/fs3216.cpp40
1 files changed, 39 insertions, 1 deletions
diff --git a/src/mame/drivers/fs3216.cpp b/src/mame/drivers/fs3216.cpp
index 16e38351d80..66a48a966fb 100644
--- a/src/mame/drivers/fs3216.cpp
+++ b/src/mame/drivers/fs3216.cpp
@@ -72,6 +72,7 @@ private:
void floppy_select_w(offs_t offset, u16 data);
void floppy_control_w(u8 data);
u8 floppy_status_r();
+ TIMER_CALLBACK_MEMBER(fdc_dma);
u8 fdc_ram_r(offs_t offset);
void fdc_ram_w(offs_t offset, u8 data);
@@ -99,6 +100,7 @@ private:
u8 m_floppy_select;
u8 m_fdc_select;
u16 m_fdc_dma_count;
+ emu_timer *m_fdc_dma_timer;
std::unique_ptr<u8[]> m_fdc_ram;
};
@@ -110,12 +112,14 @@ void fs3216_state::machine_start()
std::fill(std::begin(m_mmu_reg), std::end(m_mmu_reg), 0);
- m_floppy_status = 0;
+ m_floppy_status = 0x80;
m_floppy_control = 0;
m_floppy_select = 0;
m_fdc_select = 0;
m_fdc_dma_count = 0;
+ m_fdc_dma_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(fs3216_state::fdc_dma), this));
+
save_item(NAME(m_mmu_reg));
save_item(NAME(m_from_reset));
save_item(NAME(m_floppy_status));
@@ -263,9 +267,16 @@ WRITE_LINE_MEMBER(fs3216_state::fdc_int_w)
WRITE_LINE_MEMBER(fs3216_state::fdc_drq_w)
{
if (state)
+ {
m_floppy_status |= 0x01;
+ if (BIT(m_floppy_control, 3) && !m_fdc_dma_timer->enabled())
+ m_fdc_dma_timer->adjust(attotime::from_hz(16_MHz_XTAL / 64));
+ }
else
+ {
m_floppy_status &= 0xfe;
+ m_fdc_dma_timer->adjust(attotime::never);
+ }
}
WRITE_LINE_MEMBER(fs3216_state::fdc_hdl_w)
@@ -338,6 +349,20 @@ void fs3216_state::floppy_control_w(u8 data)
m_fdc->tc_w(0);
}
+ if (BIT(data, 3) && BIT(m_floppy_status, 0))
+ {
+ if (!m_fdc_dma_timer->enabled())
+ {
+ m_fdc_dma_timer->adjust(attotime::from_hz(16_MHz_XTAL / 64));
+ m_floppy_status |= 0x04;
+ }
+ }
+ else
+ {
+ m_fdc_dma_timer->adjust(attotime::never);
+ m_floppy_status &= 0xfb;
+ }
+
m_fdc->set_unscaled_clock(16_MHz_XTAL / (BIT(data, 0) ? 4 : 2));
}
@@ -346,6 +371,19 @@ u8 fs3216_state::floppy_status_r()
return m_floppy_status;
}
+TIMER_CALLBACK_MEMBER(fs3216_state::fdc_dma)
+{
+ if (BIT(m_floppy_control, 4))
+ m_fdc_ram[m_fdc_dma_count & 0x7ff] = m_fdc->dma_r();
+ else
+ m_fdc->dma_w(m_fdc_ram[m_fdc_dma_count & 0x7ff]);
+ m_floppy_status &= 0xfb;
+
+ ++m_fdc_dma_count;
+ if (BIT(m_fdc_dma_count, 11))
+ m_fdc->tc_w(1);
+}
+
u8 fs3216_state::fdc_ram_r(offs_t offset)
{
if (!machine().side_effects_disabled())