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dgnalpha: Fix disk boot by removing old hack to ignore first FDC IRQ

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This commit is contained in:
AJR 2020-04-02 17:45:33 -04:00
parent 72b45cbb01
commit 076f4af753
2 changed files with 9 additions and 29 deletions
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12
src/mame/includes/dgnalpha.h
View File

@ -44,10 +44,7 @@ public:
m_pia_2(*this, PIA2_TAG),
m_ay8912(*this, AY8912_TAG),
m_fdc(*this, WD2797_TAG),
m_floppy0(*this, WD2797_TAG ":0"),
m_floppy1(*this, WD2797_TAG ":1"),
m_floppy2(*this, WD2797_TAG ":2"),
m_floppy3(*this, WD2797_TAG ":3")
m_floppy(*this, WD2797_TAG ":%u", 0U)
{
}
@ -84,12 +81,7 @@ private:
required_device<pia6821_device> m_pia_2;
required_device<ay8912_device> m_ay8912;
required_device<wd2797_device> m_fdc;
required_device<floppy_connector> m_floppy0;
required_device<floppy_connector> m_floppy1;
required_device<floppy_connector> m_floppy2;
required_device<floppy_connector> m_floppy3;
uint8_t m_just_reset;
required_device_array<floppy_connector, 4> m_floppy;
/* modem */
uint8_t modem_r(offs_t offset);

26
src/mame/machine/dgnalpha.cpp
View File

@ -77,7 +77,6 @@ keeping track of it in a variable in the driver.
void dragon_alpha_state::device_start(void)
{
dragon_state::device_start();
save_item(NAME(m_just_reset));
}
@ -89,7 +88,6 @@ void dragon_alpha_state::device_start(void)
void dragon_alpha_state::device_reset(void)
{
dragon_state::device_reset();
m_just_reset = 1;
}
@ -317,19 +315,16 @@ WRITE8_MEMBER( dragon_alpha_state::psg_porta_write )
floppy_image_device *floppy = nullptr;
if (BIT(data, 0)) floppy = m_floppy0->get_device();
if (BIT(data, 1)) floppy = m_floppy1->get_device();
if (BIT(data, 2)) floppy = m_floppy2->get_device();
if (BIT(data, 3)) floppy = m_floppy3->get_device();
for (int n = 0; n < 4; n++)
if (BIT(data, n))
floppy = m_floppy[n]->get_device();
m_fdc->set_floppy(floppy);
// todo: turning the motor on with bit 4 isn't giving the drive enough
// time to spin up, how does it work in hardware?
if (m_floppy0->get_device()) m_floppy0->get_device()->mon_w(0);
if (m_floppy1->get_device()) m_floppy1->get_device()->mon_w(0);
if (m_floppy2->get_device()) m_floppy2->get_device()->mon_w(0);
if (m_floppy3->get_device()) m_floppy3->get_device()->mon_w(0);
for (auto &f : m_floppy)
if (f->get_device()) f->get_device()->mon_w(0);
m_fdc->dden_w(BIT(data, 5));
}
@ -347,15 +342,8 @@ WRITE_LINE_MEMBER( dragon_alpha_state::fdc_intrq_w )
{
if (state)
{
if (m_just_reset)
{
m_just_reset = 0;
}
else
{
if (m_pia_2->ca2_output_z())
m_maincpu->set_input_line(INPUT_LINE_NMI, ASSERT_LINE);
}
if (m_pia_2->ca2_output_z())
m_maincpu->set_input_line(INPUT_LINE_NMI, ASSERT_LINE);
}
else
{