Added 8" DSSD floppy type, WD177x inverted bus, and fixed DSKCHG signal. (nw)

src/emu/imagedev/floppy.c

@@ -27,6 +27,7 @@ const device_type FLOPPY_525_DD = &device_creator<floppy_525_dd>;
 const device_type FLOPPY_525_QD = &device_creator<floppy_525_qd>;
 const device_type FLOPPY_525_HD = &device_creator<floppy_525_hd>;
 const device_type FLOPPY_8_SSSD = &device_creator<floppy_8_sssd>;
+const device_type FLOPPY_8_DSSD = &device_creator<floppy_8_dssd>;
 const device_type FLOPPY_8_SSDD = &device_creator<floppy_8_ssdd>;
 const device_type FLOPPY_8_DSDD = &device_creator<floppy_8_dsdd>;
 
@@ -201,7 +202,7 @@ void floppy_image_device::device_start()
 	cyl = 0;
 	ss  = 0;
 	stp = 1;
-	dskchg = 0;
+	dskchg = exists() ? 1 : 0;
 	index_timer = timer_alloc(0);
 	image_dirty = false;
 }
@@ -364,6 +365,7 @@ void floppy_image_device::index_resync()
 
 	if(new_idx != idx) {
 		idx = new_idx;
+
 		if (!cur_index_pulse_cb.isnull())
 			cur_index_pulse_cb(this, idx);
 	}
@@ -1142,7 +1144,7 @@ void floppy_525_hd::handled_variants(UINT32 *variants, int &var_count) const
 }
 
 floppy_8_sssd::floppy_8_sssd(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
-	floppy_image_device(mconfig, FLOPPY_8_SSSD, "8\" single density floppy drive", tag, owner, clock)
+	floppy_image_device(mconfig, FLOPPY_8_SSSD, "8\" single density single sided floppy drive", tag, owner, clock)
 {
 }
 
@@ -1165,6 +1167,31 @@ void floppy_8_sssd::handled_variants(UINT32 *variants, int &var_count) const
 	variants[var_count++] = floppy_image::SSSD;
 }
 
+floppy_8_dssd::floppy_8_dssd(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+	floppy_image_device(mconfig, FLOPPY_8_SSSD, "8\" single density double sided floppy drive", tag, owner, clock)
+{
+}
+
+floppy_8_dssd::~floppy_8_dssd()
+{
+}
+
+void floppy_8_dssd::setup_characteristics()
+{
+	form_factor = floppy_image::FF_8;
+	tracks = 77;
+	sides = 2;
+	motor_always_on = true;
+	set_rpm(360);
+}
+
+void floppy_8_dssd::handled_variants(UINT32 *variants, int &var_count) const
+{
+	var_count = 0;
+	variants[var_count++] = floppy_image::SSSD;
+	variants[var_count++] = floppy_image::DSSD;
+}
+
 floppy_8_ssdd::floppy_8_ssdd(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
 	floppy_image_device(mconfig, FLOPPY_8_DSDD, "8\" double density single sided floppy drive", tag, owner, clock)
 {

src/emu/imagedev/floppy.h

@@ -352,6 +352,17 @@ protected:
 	virtual void setup_characteristics();
 };
 
+class floppy_8_dssd : public floppy_image_device {
+public:
+	floppy_8_dssd(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+	virtual ~floppy_8_dssd();
+	virtual void handled_variants(UINT32 *variants, int &var_count) const;
+	virtual void device_config_complete() { m_shortname = "floppy_8_dssd"; }
+	virtual const char *image_interface() const { return "floppy_8"; }
+protected:
+	virtual void setup_characteristics();
+};
+
 class floppy_8_ssdd : public floppy_image_device {
 public:
 	floppy_8_ssdd(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
@@ -410,6 +421,7 @@ extern const device_type FLOPPY_525_DD;
 extern const device_type FLOPPY_525_QD;
 extern const device_type FLOPPY_525_HD;
 extern const device_type FLOPPY_8_SSSD;
+extern const device_type FLOPPY_8_DSSD;
 extern const device_type FLOPPY_8_SSDD;
 extern const device_type FLOPPY_8_DSDD;
 

src/emu/machine/wd_fdc.c

@@ -875,6 +875,8 @@ void wd_fdc_t::do_cmd_w()
 
 void wd_fdc_t::cmd_w(UINT8 val)
 {
+	if (inverted_bus) val ^= 0xff;
+	
 	logerror("wd1772 cmd: %02x\n", val);
 
 	if(intrq && !(intrq_cond & I_IMM)) {
@@ -929,7 +931,10 @@ UINT8 wd_fdc_t::status_r()
 			status &= ~S_NRDY;
 	}
 
-	return status;
+	UINT8 val = status;
+	if (inverted_bus) val ^= 0xff;
+	
+	return val;
 }
 
 void wd_fdc_t::do_track_w()
@@ -940,6 +945,8 @@ void wd_fdc_t::do_track_w()
 
 void wd_fdc_t::track_w(UINT8 val)
 {
+	if (inverted_bus) val ^= 0xff;
+
 	// No more than one write in flight
 	if(track_buffer != -1)
 		return;
@@ -950,7 +957,10 @@ void wd_fdc_t::track_w(UINT8 val)
 
 UINT8 wd_fdc_t::track_r()
 {
-	return track;
+	UINT8 val = track;
+	if (inverted_bus) val ^= 0xff;
+	
+	return val;
 }
 
 void wd_fdc_t::do_sector_w()
@@ -961,6 +971,8 @@ void wd_fdc_t::do_sector_w()
 
 void wd_fdc_t::sector_w(UINT8 val)
 {
+	if (inverted_bus) val ^= 0xff;
+	
 	// No more than one write in flight
 	if(sector_buffer != -1)
 		return;
@@ -971,11 +983,16 @@ void wd_fdc_t::sector_w(UINT8 val)
 
 UINT8 wd_fdc_t::sector_r()
 {
-	return sector;
+	UINT8 val = sector;
+	if (inverted_bus) val ^= 0xff;
+	
+	return val;
 }
 
 void wd_fdc_t::data_w(UINT8 val)
 {
+	if (inverted_bus) val ^= 0xff;
+	
 	data = val;
 	drop_drq();
 }
@@ -983,7 +1000,11 @@ void wd_fdc_t::data_w(UINT8 val)
 UINT8 wd_fdc_t::data_r()
 {
 	drop_drq();
-	return data;
+
+	UINT8 val = data;
+	if (inverted_bus) val ^= 0xff;
+	
+	return val;
 }
 
 void wd_fdc_t::gen_w(int reg, UINT8 val)

src/lib/formats/wd177x_dsk.h

@@ -26,7 +26,7 @@ public:
 		int per_sector_size[40]; // if sector_base_size is 0
 		int sector_base_id;      // 0 or 1 usually, -1 if there's interleave
 		int per_sector_id[40];   // if sector_base_id is -1.  If both per are used, then sector per_sector_id[i] has size per_sector_size[i]
-		int gap_1;               // Usually around 544 - number of 4e between index and first IDAM sync
+		int gap_1;               // Usually around 80 - number of 4e between index and first IDAM sync
 		int gap_2;               // 22 for <=1.44Mb, 41 for 2.88Mb - number of 4e between sector header and data sync
 		int gap_3;               // Usually 84 - number of 4e between sector crc and next IDAM
 	};