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bbc_cv1797: Implemented side and motor control, and now works.

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This commit is contained in:
Nigel Barnes 2020-06-17 15:40:54 +01:00
parent fb3758b667
commit c6d5c5e7d2
2 changed files with 32 additions and 39 deletions
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60
src/devices/bus/bbc/fdc/cv1797.cpp
View File

@ -6,6 +6,10 @@
http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/ComputerVillage_FDC.html
Notes:
Everything seems to work, but schematic required to confirm implementation
of side and motor control.
**********************************************************************/
@ -59,12 +63,12 @@ ROM_END
void bbc_cv1797_device::device_add_mconfig(machine_config &config)
{
FD1797(config, m_fdc, 8_MHz_XTAL / 8);
m_fdc->intrq_wr_callback().set(DEVICE_SELF_OWNER, FUNC(bbc_fdc_slot_device::intrq_w));
m_fdc->drq_wr_callback().set(DEVICE_SELF_OWNER, FUNC(bbc_fdc_slot_device::drq_w));
m_fdc->hld_wr_callback().set(FUNC(bbc_cv1797_device::motor_w));
m_fdc->sso_wr_callback().set(FUNC(bbc_cv1797_device::fdc_sso_w));
m_fdc->hld_wr_callback().set(FUNC(bbc_cv1797_device::fdc_hld_w));
FLOPPY_CONNECTOR(config, m_floppy0, bbc_floppies_525, "525qd", floppy_formats).enable_sound(true);
FLOPPY_CONNECTOR(config, m_floppy1, bbc_floppies_525, "525qd", floppy_formats).enable_sound(true);
FLOPPY_CONNECTOR(config, m_floppies[0], bbc_floppies_525, "525qd", floppy_formats).enable_sound(true);
FLOPPY_CONNECTOR(config, m_floppies[1], bbc_floppies_525, "525qd", floppy_formats).enable_sound(true);
}
const tiny_rom_entry *bbc_cv1797_device::device_rom_region() const
@ -84,9 +88,8 @@ bbc_cv1797_device::bbc_cv1797_device(const machine_config &mconfig, const char *
: device_t(mconfig, BBC_CV1797, tag, owner, clock)
, device_bbc_fdc_interface(mconfig, *this)
, m_fdc(*this, "fd1797")
, m_floppy0(*this, "fd1797:0")
, m_floppy1(*this, "fd1797:1")
, m_drive_control(0)
, m_floppies(*this, "fd1797:%u", 0)
, m_floppy(nullptr)
{
}
@ -96,7 +99,6 @@ bbc_cv1797_device::bbc_cv1797_device(const machine_config &mconfig, const char *
void bbc_cv1797_device::device_start()
{
save_item(NAME(m_drive_control));
}
@ -110,11 +112,11 @@ uint8_t bbc_cv1797_device::read(offs_t offset)
if (offset & 0x04)
{
data = m_fdc->read(offset & 0x03);
data = 0xfe;
}
else
{
data = m_drive_control;
data = m_fdc->read(offset & 0x03);
}
return data;
}
@ -123,36 +125,30 @@ void bbc_cv1797_device::write(offs_t offset, uint8_t data)
{
if (offset & 0x04)
{
m_fdc->write(offset & 0x03, data);
}
else
{
floppy_image_device *floppy = nullptr;
m_drive_control = data;
logerror("fdc: Drive control %02x\n", data);
// bit 0: drive select
switch (BIT(data, 0))
{
case 0: floppy = m_floppy0->get_device(); break;
case 1: floppy = m_floppy1->get_device(); break;
}
m_fdc->set_floppy(floppy);
m_floppy = m_floppies[BIT(data, 0)]->get_device();
m_fdc->set_floppy(m_floppy);
// bit 1: side select
if (floppy)
floppy->ss_w(BIT(data, 1));
if (m_floppy)
m_floppy->ss_w(BIT(data, 1));
// bit 2: density
m_fdc->dden_w(!BIT(data, 2));
// bit 6: reset
//m_fdc->mr_w(!BIT(data, 6));
}
else
{
m_fdc->write(offset & 0x03, data);
}
}
WRITE_LINE_MEMBER(bbc_cv1797_device::motor_w)
WRITE_LINE_MEMBER(bbc_cv1797_device::fdc_sso_w)
{
if (m_floppy0->get_device()) m_floppy0->get_device()->mon_w(!state);
if (m_floppy1->get_device()) m_floppy1->get_device()->mon_w(!state);
// TODO: schematic required to confirm usage.
}
WRITE_LINE_MEMBER(bbc_cv1797_device::fdc_hld_w)
{
if (m_floppy)
m_floppy->mon_w(!state);
}

11
src/devices/bus/bbc/fdc/cv1797.h
View File

@ -27,8 +27,6 @@ class bbc_cv1797_device :
public device_bbc_fdc_interface
{
public:
static constexpr feature_type imperfect_features() { return feature::DISK; }
// construction/destruction
bbc_cv1797_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
@ -46,13 +44,12 @@ protected:
private:
DECLARE_FLOPPY_FORMATS(floppy_formats);
DECLARE_WRITE_LINE_MEMBER(motor_w);
DECLARE_WRITE_LINE_MEMBER(fdc_sso_w);
DECLARE_WRITE_LINE_MEMBER(fdc_hld_w);
required_device<fd1797_device> m_fdc;
required_device<floppy_connector> m_floppy0;
optional_device<floppy_connector> m_floppy1;
int m_drive_control;
required_device_array<floppy_connector, 2> m_floppies;
floppy_image_device* m_floppy;
};