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z80dma: add PULSE mode handling

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This commit is contained in:
Miodrag Milanovic 2024-02-15 17:52:26 +01:00
parent e5df3dd7a1
commit d089f6b649
2 changed files with 21 additions and 1 deletions
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21
src/devices/machine/z80dma.cpp
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@ -134,7 +134,7 @@ constexpr int TM_SEARCH_TRANSFER = 0x03;
#define INT_ON_END_OF_BLOCK (INTERRUPT_CTRL & 0x02)
#define INT_ON_READY (INTERRUPT_CTRL & 0x40)
#define STATUS_AFFECTS_VECTOR (INTERRUPT_CTRL & 0x20)
#define PULSE_GENERATED (INTERRUPT_CTRL & 0x04)
//**************************************************************************
@ -190,6 +190,7 @@ void z80dma_device::device_start()
save_item(NAME(m_rdy));
save_item(NAME(m_force_ready));
save_item(NAME(m_is_read));
save_item(NAME(m_is_pulse));
save_item(NAME(m_cur_cycle));
save_item(NAME(m_latch));
}
@ -209,6 +210,7 @@ void z80dma_device::device_reset()
m_read_num_follow = m_read_cur_follow = 0;
m_reset_pointer = 0;
m_is_read = false;
m_is_pulse = false;
memset(m_regs, 0, sizeof(m_regs));
memset(m_regs_follow, 0, sizeof(m_regs_follow));
@ -485,6 +487,23 @@ TIMER_CALLBACK_MEMBER(z80dma_device::timerproc)
return;
}
if (PULSE_GENERATED)
{
if (m_is_pulse)
{
m_out_int_cb(CLEAR_LINE);
m_is_pulse = false;
}
else
{
if ((m_byte_counter & 0xff)==PULSE_CTRL && is_ready())
{
m_is_pulse = true;
m_out_int_cb(ASSERT_LINE);
}
}
}
if (m_is_read && !is_ready()) return;
if (m_is_read)

1
src/devices/machine/z80dma.h
View File

@ -125,6 +125,7 @@ private:
uint8_t m_reset_pointer;
bool m_is_read;
bool m_is_pulse;
uint8_t m_cur_cycle;
uint8_t m_latch;