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wd_fdc: add a SSO callback.

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Some machines do not connect the SSO output to control the floppy side. When
this new callback option is used the wd_fdc no longer controls the floppy,
rather calls the SSO callback.
This commit is contained in:
68bit 2019-08-05 15:15:08 +10:00
parent 6bf8519cf5
commit 26897dd6ff
2 changed files with 41 additions and 11 deletions
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47
src/devices/machine/wd_fdc.cpp
View File

@ -85,6 +85,7 @@ wd_fdc_device_base::wd_fdc_device_base(const machine_config &mconfig, device_typ
drq_cb(*this),
hld_cb(*this),
enp_cb(*this),
sso_cb(*this),
ready_cb(*this), // actually output by the drive, not by the FDC
enmf_cb(*this)
{
@ -108,6 +109,7 @@ void wd_fdc_device_base::device_start()
drq_cb.resolve();
hld_cb.resolve();
enp_cb.resolve();
sso_cb.resolve();
ready_cb.resolve();
enmf_cb.resolve();
@ -475,8 +477,8 @@ void wd_fdc_device_base::read_sector_start()
main_state = READ_SECTOR;
status &= ~(S_CRC|S_LOST|S_RNF|S_WP|S_DDM);
drop_drq();
if(side_control && floppy)
floppy->ss_w((command & 0x02) ? 1 : 0);
if(side_control)
update_sso();
sub_state = motor_control ? SPINUP : SPINUP_DONE;
status_type_1 = false;
read_sector_continue();
@ -576,8 +578,8 @@ void wd_fdc_device_base::read_track_start()
main_state = READ_TRACK;
status &= ~(S_LOST|S_RNF);
drop_drq();
if(side_control && floppy)
floppy->ss_w((command & 0x02) ? 1 : 0);
if(side_control)
update_sso();
sub_state = motor_control ? SPINUP : SPINUP_DONE;
status_type_1 = false;
read_track_continue();
@ -655,8 +657,8 @@ void wd_fdc_device_base::read_id_start()
main_state = READ_ID;
status &= ~(S_WP|S_DDM|S_LOST|S_RNF);
drop_drq();
if(side_control && floppy)
floppy->ss_w((command & 0x02) ? 1 : 0);
if(side_control)
update_sso();
sub_state = motor_control ? SPINUP : SPINUP_DONE;
status_type_1 = false;
read_id_continue();
@ -732,8 +734,8 @@ void wd_fdc_device_base::write_track_start()
main_state = WRITE_TRACK;
status &= ~(S_WP|S_DDM|S_LOST|S_RNF);
drop_drq();
if(side_control && floppy)
floppy->ss_w((command & 0x02) ? 1 : 0);
if(side_control)
update_sso();
sub_state = motor_control ? SPINUP : SPINUP_DONE;
status_type_1 = false;
@ -843,8 +845,8 @@ void wd_fdc_device_base::write_sector_start()
main_state = WRITE_SECTOR;
status &= ~(S_CRC|S_LOST|S_RNF|S_WP|S_DDM);
drop_drq();
if(side_control && floppy)
floppy->ss_w((command & 0x02) ? 1 : 0);
if(side_control)
update_sso();
sub_state = motor_control ? SPINUP : SPINUP_DONE;
status_type_1 = false;
write_sector_continue();
@ -2206,6 +2208,31 @@ void wd_fdc_device_base::drop_drq()
}
}
void wd_fdc_device_base::update_sso()
{
// The 'side_control' flag is interpreted as meaning that the FDC has
// a SSO output feature, not that it necessarily controls the floppy.
if(!side_control)
return;
uint8_t side = (command & 0x02) ? 1 : 0;
// If a SSO callback is defined then it is assumed that this callback
// will update the floppy side if that is the connection. There are
// some machines that use the SSO output for other purposes.
if(!sso_cb.isnull()) {
sso_cb(side);
return;
}
// If a SSO callback is not defined then assume that the machine
// intended the driver to update the floppy side which appears to be
// the case in most cases.
if(floppy) {
floppy->ss_w((command & 0x02) ? 1 : 0);
}
}
int wd_fdc_device_base::calc_sector_size(uint8_t size, uint8_t command) const
{
return 128 << (size & 3);

5
src/devices/machine/wd_fdc.h
View File

@ -53,6 +53,7 @@ public:
auto drq_wr_callback() { return drq_cb.bind(); }
auto hld_wr_callback() { return hld_cb.bind(); }
auto enp_wr_callback() { return enp_cb.bind(); }
auto sso_wr_callback() { return sso_cb.bind(); }
auto ready_wr_callback() { return ready_cb.bind(); }
auto enmf_rd_callback() { return enmf_cb.bind(); }
@ -291,7 +292,7 @@ private:
live_info cur_live, checkpoint_live;
devcb_write_line intrq_cb, drq_cb, hld_cb, enp_cb, ready_cb;
devcb_write_line intrq_cb, drq_cb, hld_cb, enp_cb, sso_cb, ready_cb;
devcb_read_line enmf_cb;
uint8_t format_last_byte;
@ -355,6 +356,8 @@ private:
void drop_drq();
void set_drq();
void update_sso();
};
class wd_fdc_analog_device_base : public wd_fdc_device_base {