static WRITE8_HANDLER( svi318_fdc_density_side_w )
{
device_t *fdc = space->machine().device("wd179x");
wd17xx_dden_w(fdc, BIT(data, 0));
wd17xx_set_side(fdc, BIT(data, 1));
}
void coco_fdc_device::dskreg_w(UINT8 data)
{
UINT8 drive = 0;
UINT8 head = 0;
if (LOG_FDC)
{
logerror("fdc_coco_dskreg_w(): %c%c%c%c%c%c%c%c ($%02x)\n",
data & 0x80 ? 'H' : 'h',
data & 0x40 ? '3' : '.',
data & 0x20 ? 'D' : 'S',
data & 0x10 ? 'P' : 'p',
data & 0x08 ? 'M' : 'm',
data & 0x04 ? '2' : '.',
data & 0x02 ? '1' : '.',
data & 0x01 ? '0' : '.',
data);
}
/* An email from John Kowalski informed me that if the DS3 is
* high, and one of the other drive bits is selected (DS0-DS2), then the
* second side of DS0, DS1, or DS2 is selected. If multiple bits are
* selected in other situations, then both drives are selected, and any
* read signals get yucky.
*/
if (data & 0x04)
drive = 2;
else if (data & 0x02)
drive = 1;
else if (data & 0x01)
drive = 0;
else if (data & 0x40)
drive = 3;
device_t *floppy[4];
floppy[0] = subdevice(FLOPPY_0);
floppy[1] = subdevice(FLOPPY_1);
floppy[2] = subdevice(FLOPPY_2);
floppy[3] = subdevice(FLOPPY_3);
for (int i = 0; i < 4; i++)
{
floppy_mon_w(floppy[i], i == drive ? CLEAR_LINE : ASSERT_LINE);
}
head = ((data & 0x40) && (drive != 3)) ? 1 : 0;
m_dskreg = data;
update_lines();
wd17xx_set_drive(m_wd17xx, drive);
wd17xx_set_side(m_wd17xx, head);
wd17xx_dden_w(m_wd17xx, !BIT(m_dskreg, 5));
}
static void osborne1_load_proc(device_image_interface &image)
{
int size = image.length();
osborne1_state *state = image.device().machine().driver_data<osborne1_state>();
switch( size )
{
case 40 * 10 * 256:
wd17xx_dden_w(state->m_fdc, ASSERT_LINE);
break;
case 40 * 5 * 1024:
wd17xx_dden_w(state->m_fdc, CLEAR_LINE);
break;
case 40 * 8 * 512:
wd17xx_dden_w(state->m_fdc, ASSERT_LINE);
break;
case 40 * 18 * 128:
wd17xx_dden_w(state->m_fdc, ASSERT_LINE);
break;
case 40 * 9 * 512:
wd17xx_dden_w(state->m_fdc, CLEAR_LINE);
break;
}
}
void dragon_fdc_device::dskreg_w(UINT8 data)
{
if (LOG_FDC)
{
logerror("fdc_dragon_dskreg_w(): %c%c%c%c%c%c%c%c ($%02x)\n",
data & 0x80 ? 'X' : 'x',
data & 0x40 ? 'X' : 'x',
data & 0x20 ? 'N' : 'n',
data & 0x10 ? 'P' : 'p',
data & 0x08 ? 'S' : 'D',
data & 0x04 ? 'M' : 'm',
data & 0x02 ? '1' : '0',
data & 0x01 ? '1' : '0',
data);
}
if (data & 0x04)
wd17xx_set_drive(m_wd17xx, data & 0x03);
wd17xx_dden_w(m_wd17xx, BIT(data, 3));
m_dskreg = data;
}
