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nascom_fdc: proper support for single/double sided disk drives

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This commit is contained in:
Dirk Best 2015-05-20 15:59:11 +02:00
parent 611bb042f4
commit a877bb053b
2 changed files with 53 additions and 5 deletions
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49
src/emu/bus/nasbus/floppy.c
View File

@ -10,6 +10,14 @@
#include "formats/nascom_dsk.h"
//**************************************************************************
// CONSTANTS/MACROS
//**************************************************************************
#define VERBOSE 1
#define VERBOSE_STATUS 0
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
@ -88,6 +96,22 @@ void nascom_fdc_device::device_reset()
m_nasbus->m_io->install_read_handler(0xe5, 0xe5, read8_delegate(FUNC(nascom_fdc_device::status_r), this));
}
//-------------------------------------------------
// device_reset_after_children - device-specific reset after children
//-------------------------------------------------
void nascom_fdc_device::device_reset_after_children()
{
// sanity check
if (m_floppy0->get_device() && m_floppy1->get_device())
if (m_floppy0->get_device()->get_sides() != m_floppy1->get_device()->get_sides())
fatalerror("Floppy drive 0 and 1 need to be of the same type.\n");
if (m_floppy2->get_device() && m_floppy3->get_device())
if (m_floppy2->get_device()->get_sides() != m_floppy3->get_device()->get_sides())
fatalerror("Floppy drive 2 and 3 need to be of the same type.\n");
}
//**************************************************************************
// IMPLEMENTATION
@ -95,11 +119,31 @@ void nascom_fdc_device::device_reset()
READ8_MEMBER( nascom_fdc_device::select_r )
{
return m_select | 0xa0;
m_select |= (0x80 | 0x20);
// double sided drive for drive 0/1?
if (m_floppy0->get_device() && (m_floppy0->get_device()->get_sides() == 2))
m_select &= ~0x20;
if (m_floppy1->get_device() && (m_floppy1->get_device()->get_sides() == 2))
m_select &= ~0x20;
// double sided drive for drive 2/3?
if (m_floppy2->get_device() && (m_floppy2->get_device()->get_sides() == 2))
m_select &= ~0x80;
if (m_floppy3->get_device() && (m_floppy3->get_device()->get_sides() == 2))
m_select &= ~0x80;
if (VERBOSE)
logerror("nascom_fdc_device::select_r: 0x%02x\n", m_select);
return m_select;
}
WRITE8_MEMBER( nascom_fdc_device::select_w )
{
if (VERBOSE)
logerror("nascom_fdc_device::select_w: 0x%02x\n", data);
m_floppy = NULL;
@ -129,5 +173,8 @@ READ8_MEMBER( nascom_fdc_device::status_r )
data |= m_fdc->intrq_r() << 0;
data |= m_fdc->drq_r() << 7;
if (VERBOSE_STATUS)
logerror("nascom_fdc_device::status_r: 0x%02x\n", data);
return data;
}

7
src/emu/bus/nasbus/floppy.h
View File

@ -28,9 +28,9 @@ public:
// construction/destruction
nascom_fdc_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
DECLARE_READ8_MEMBER( select_r );
DECLARE_WRITE8_MEMBER( select_w );
DECLARE_READ8_MEMBER( status_r );
DECLARE_READ8_MEMBER(select_r);
DECLARE_WRITE8_MEMBER(select_w);
DECLARE_READ8_MEMBER(status_r);
DECLARE_FLOPPY_FORMATS(floppy_formats);
@ -38,6 +38,7 @@ protected:
virtual machine_config_constructor device_mconfig_additions() const;
virtual void device_start();
virtual void device_reset();
virtual void device_reset_after_children();
private:
required_device<fd1793_t> m_fdc;