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cgenie_fdc: Add support for the density switch

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This commit is contained in:
Dirk Best 2015-05-26 17:07:28 +02:00
parent a9978436be
commit 7fe1a69ed8
2 changed files with 25 additions and 12 deletions
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34
src/emu/bus/cgenie/expansion/floppy.c
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@ -5,10 +5,10 @@
EACA Colour Genie Floppy Disc Controller
TODO:
- Only native MESS .mfi files load
- Only native MESS .mfi files load (some sectors are marked DDM)
- FM mode disks can be formatted but don't work correctly
- What's the exact FD1793 model?
- How does it turn off the motor?
- How does it switch between FM/MFM?
- What's the source of the timer and the exact timings?
***************************************************************************/
@ -24,9 +24,6 @@
#define VERBOSE 0
// set to 1 to test fm disk formats
#define FM_MODE 0
//**************************************************************************
// DEVICE DEFINITIONS
@ -34,6 +31,15 @@
const device_type CGENIE_FDC = &device_creator<cgenie_fdc_device>;
DEVICE_ADDRESS_MAP_START( mmio, 8, cgenie_fdc_device )
AM_RANGE(0xe0, 0xe3) AM_MIRROR(0x10) AM_READWRITE(irq_r, select_w)
AM_RANGE(0xec, 0xef) AM_MIRROR(0x10) AM_DEVREAD("fd1793", fd1793_t, read)
AM_RANGE(0xec, 0xec) AM_MIRROR(0x10) AM_WRITE(command_w)
AM_RANGE(0xed, 0xed) AM_MIRROR(0x10) AM_DEVWRITE("fd1793", fd1793_t, track_w)
AM_RANGE(0xee, 0xee) AM_MIRROR(0x10) AM_DEVWRITE("fd1793", fd1793_t, sector_w)
AM_RANGE(0xef, 0xef) AM_MIRROR(0x10) AM_DEVWRITE("fd1793", fd1793_t, data_w)
ADDRESS_MAP_END
FLOPPY_FORMATS_MEMBER( cgenie_fdc_device::floppy_formats )
FLOPPY_CGENIE_FORMAT
FLOPPY_FORMATS_END
@ -132,10 +138,7 @@ void cgenie_fdc_device::device_reset()
m_slot->m_program->install_rom(0xc000, 0xdfff, memregion("software")->base());
// memory mapped i/o
m_slot->m_program->install_read_handler(0xffe0, 0xffe3, 0, 0x10, read8_delegate(FUNC(cgenie_fdc_device::irq_r), this));
m_slot->m_program->install_write_handler(0xffe0, 0xffe3, 0, 0x10, write8_delegate(FUNC(cgenie_fdc_device::select_w), this));
m_slot->m_program->install_read_handler(0xffec, 0xffef, 0, 0x10, read8_delegate(FUNC(fd1793_t::read), m_fdc.target()));
m_slot->m_program->install_write_handler(0xffec, 0xffef, 0, 0x10, write8_delegate(FUNC(fd1793_t::write), m_fdc.target()));
m_slot->m_program->install_device(0xff00, 0xffff, *this, &cgenie_fdc_device::mmio);
// map extra socket
if (m_socket->exists())
@ -199,9 +202,6 @@ WRITE8_MEMBER( cgenie_fdc_device::select_w )
if (VERBOSE)
logerror("cgenie_fdc_device::motor_w: 0x%02x\n", data);
if (FM_MODE)
m_fdc->dden_w(1);
m_floppy = NULL;
if (BIT(data, 0)) m_floppy = m_floppy0->get_device();
@ -217,3 +217,13 @@ WRITE8_MEMBER( cgenie_fdc_device::select_w )
m_floppy->mon_w(0);
}
}
WRITE8_MEMBER( cgenie_fdc_device::command_w )
{
// density select is encoded into this pseudo-command
if ((data & 0xfe) == 0xfe)
m_fdc->dden_w(!BIT(data, 0));
// forward to the controller
m_fdc->cmd_w(data);
}

3
src/emu/bus/cgenie/expansion/floppy.h
View File

@ -29,6 +29,8 @@ public:
// construction/destruction
cgenie_fdc_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
DECLARE_ADDRESS_MAP(mmio, 8);
TIMER_DEVICE_CALLBACK_MEMBER(timer_callback);
DECLARE_DEVICE_IMAGE_LOAD_MEMBER(socket_load);
@ -36,6 +38,7 @@ public:
DECLARE_WRITE_LINE_MEMBER(intrq_w);
DECLARE_READ8_MEMBER(irq_r);
DECLARE_WRITE8_MEMBER(select_w);
DECLARE_WRITE8_MEMBER(command_w);
DECLARE_FLOPPY_FORMATS(floppy_formats);