---

r7261 Thursday 4th February, 2010 at 14:44:14 UTC by Curt Coder
CBM drives cleanup.

[src/mess/machine]

c1541.c c1551.c c1571.c c2040.c

src/mess/machine/c2040.c

r7260	r7261
65	65	typedef struct _c2040_unit_t c2040_unit_t;
66	66	struct _c2040_unit_t
67	67	{
	68	/* motors */
68	69	int stp;                        /* stepper motor phase */
69	70	int mtr;                        /* spindle motor on */
70	71
r7260	r7261
87	88	int side;                     /* selected side */
88	89
89	90	/* IEEE-488 bus */
90		int address;                  /* bus address - 8 */
	91	int address;                  /* device address - 8 */
91	92	int rfdo;                     /* not ready for data output */
92	93	int daco;                     /* not data accepted output */
93	94	int atna;                     /* attention acknowledge */

src/mess/machine/c1541.c

r7260	r7261
165	165	typedef struct _c1541_t c1541_t;
166	166	struct _c1541_t
167	167	{
168		/* abstractions */
169		int address;                  /* serial bus address - 8 */
170		UINT8 track_buffer[G64_BUFFER_SIZE];            /* track data buffer */
171		int track_len;                  /* track length */
172		int buffer_pos;                  /* current byte position within track buffer */
173		int bit_pos;                  /* current bit position within track buffer byte */
174		int bit_count;                  /* current data byte bit counter */
175		UINT16 data;                  /* data shift register */
	168	/* IEC bus */
	169	int address;                     /* device address - 8 */
	170	int atna;                        /* attention acknowledge */
	171	int data_out;                     /* serial bus data output */
176	172
	173	/* IEEE-488 bus */
	174	int nrfd_out;                     /* not ready for data */
	175	int ndac_out;                     /* not data accepted */
	176
	177	/* motors */
	178	int stp;                        /* stepper motor phase */
	179	int mtr;                        /* spindle motor on */
	180
	181	/* track */
	182	UINT8 track_buffer[G64_BUFFER_SIZE];   /* track data buffer */
	183	int track_len;                     /* track length */
	184	int buffer_pos;                     /* current byte position within track buffer */
	185	int bit_pos;                     /* current bit position within track buffer byte */
	186	int bit_count;                     /* current data byte bit counter */
	187	UINT16 data;                     /* data shift register */
	188	UINT8 yb;                        /* GCR data byte to write */
	189
177	190	/* signals */
178		UINT8 yb;                     /* GCR data byte to write */
179		int byte;                     /* byte ready */
180		int atna;                     /* attention acknowledge */
181		int ds;                        /* density select */
182		int stp;                     /* stepping motor */
183		int soe;                     /* s? output enable */
184		int mode;                     /* mode (0 = write, 1 = read) */
185		int via0_irq;                  /* VIA #0 interrupt request */
186		int via1_irq;                  /* VIA #1 interrupt request */
	191	int ds;                           /* density select */
	192	int soe;                        /* s? output enable */
	193	int byte;                        /* byte ready */
	194	int mode;                        /* mode (0 = write, 1 = read) */
187	195
188		/* serial bus */
189		int data_out;                  /* serial bus data output */
	196	/* interrupts */
	197	int via0_irq;                     /* VIA #0 interrupt request */
	198	int via1_irq;                     /* VIA #1 interrupt request */
190	199
191		/* IEEE-488 bus */
192		int nrfd_out;                  /* not ready for data */
193		int ndac_out;                  /* not data accepted */
194
195	200	/* devices */
196	201	running_device *cpu;
197	202	running_device *via0;
r7260	r7261
732	737	via6522_interface c1541_via1_intf
733	738	-------------------------------------------------*/
734	739
	740	static void read_current_track(c1541_t *c1541)
	741	{
	742	c1541->track_len = G64_BUFFER_SIZE;
	743	c1541->buffer_pos = G64_DATA_START;
	744	c1541->bit_pos = 7;
	745	c1541->bit_count = 0;
	746
	747	/* read track data */
	748	floppy_drive_read_track_data_info_buffer(c1541->image, 0, c1541->track_buffer, &c1541->track_len);
	749
	750	/* extract track length */
	751	c1541->track_len = G64_DATA_START + ((c1541->track_buffer[1] << 8) | c1541->track_buffer[0]);
	752	}
	753
	754	static void spindle_motor(c1541_t *c1541, int mtr)
	755	{
	756	if (c1541->mtr != mtr)
	757	{
	758	if (mtr)
	759	{
	760	/* read track data */
	761	read_current_track(c1541);
	762	}
	763
	764	floppy_mon_w(c1541->image, !mtr);
	765	timer_enable(c1541->bit_timer, mtr);
	766
	767	c1541->mtr = mtr;
	768	}
	769	}
	770
	771	static void step_motor(c1541_t *c1541, int stp)
	772	{
	773	if (c1541->stp != stp)
	774	{
	775	int tracks = 0;
	776
	777	switch (c1541->stp)
	778	{
	779	case 0:   if (stp == 1) tracks++; else if (stp == 3) tracks--; break;
	780	case 1:   if (stp == 2) tracks++; else if (stp == 0) tracks--; break;
	781	case 2: if (stp == 3) tracks++; else if (stp == 1) tracks--; break;
	782	case 3: if (stp == 0) tracks++; else if (stp == 2) tracks--; break;
	783	}
	784
	785	if (tracks != 0)
	786	{
	787	/* step read/write head */
	788	floppy_drive_seek(c1541->image, tracks);
	789
	790	/* read new track data */
	791	read_current_track(c1541);
	792	}
	793
	794	c1541->stp = stp;
	795	}
	796	}
	797
735	798	static WRITE_LINE_DEVICE_HANDLER( via1_irq_w )
736	799	{
737	800	c1541_t *c1541 = get_safe_token(device->owner);
r7260	r7261
833	896
834	897	c1541_t *c1541 = get_safe_token(device->owner);
835	898
	899	/* stepper motor */
836	900	int stp = data & 0x03;
837		int ds = (data >> 5) & 0x03;
838		int mtr = BIT(data, 2);
	901	step_motor(c1541, stp);
839	902
840		/* stepper motor */
841		if (c1541->stp != stp)
842		{
843		int tracks = 0;
844
845		switch (c1541->stp)
846		{
847		case 0:   if (stp == 1) tracks++; else if (stp == 3) tracks--; break;
848		case 1:   if (stp == 2) tracks++; else if (stp == 0) tracks--; break;
849		case 2: if (stp == 3) tracks++; else if (stp == 1) tracks--; break;
850		case 3: if (stp == 0) tracks++; else if (stp == 2) tracks--; break;
851		}
852
853		if (tracks != 0)
854		{
855		c1541->track_len = G64_BUFFER_SIZE;
856		c1541->buffer_pos = G64_DATA_START;
857		c1541->bit_pos = 7;
858		c1541->bit_count = 0;
859
860		/* step read/write head */
861		floppy_drive_seek(c1541->image, tracks);
862
863		/* read track data */
864		floppy_drive_read_track_data_info_buffer(c1541->image, 0, c1541->track_buffer, &c1541->track_len);
865
866		/* extract track length */
867		c1541->track_len = G64_DATA_START + ((c1541->track_buffer[1] << 8) | c1541->track_buffer[0]);
868		}
869
870		c1541->stp = stp;
871		}
872
873	903	/* spindle motor */
874		floppy_mon_w(c1541->image, !mtr);
875		timer_enable(c1541->bit_timer, mtr);
	904	int mtr = BIT(data, 2);
	905	spindle_motor(c1541, mtr);
876	906
877	907	/* activity LED */
878	908
879	909	/* density select */
	910	int ds = (data >> 5) & 0x03;
	911
880	912	if (c1541->ds != ds)
881	913	{
882	914	timer_adjust_periodic(c1541->bit_timer, attotime_zero, 0, ATTOTIME_IN_HZ(C2040_BITRATE[ds]/4));

src/mess/machine/c1551.c

r7260	r7261
44	44	typedef struct _c1551_t c1551_t;
45	45	struct _c1551_t
46	46	{
47		UINT8 track_buffer[G64_BUFFER_SIZE];            /* track data buffer */
48		int track_len;                  /* track length */
49		int buffer_pos;                  /* current byte position within track buffer */
50		int bit_pos;                  /* current bit position within track buffer byte */
51		int bit_count;                  /* current data byte bit counter */
52		UINT16 data;                  /* data shift register */
	47	/* motors */
	48	int stp;                        /* stepper motor phase */
	49	int mtr;                        /* spindle motor on */
	50
	51	/* track */
	52	UINT8 track_buffer[G64_BUFFER_SIZE];   /* track data buffer */
	53	int track_len;                     /* track length */
	54	int buffer_pos;                     /* current byte position within track buffer */
	55	int bit_pos;                     /* current bit position within track buffer byte */
	56	int bit_count;                     /* current data byte bit counter */
	57	UINT16 data;                     /* data shift register */
	58	UINT8 yb;                        /* GCR data byte to write */
53	59
54	60	/* signals */
55		UINT8 yb;                     /* GCR data byte to write */
56		int byte;                     /* byte ready */
57		int atna;                     /* attention acknowledge */
58		int ds;                        /* density select */
59		int stp;                     /* stepping motor */
60		int soe;                     /* s? output enable */
61		int mode;                     /* mode (0 = write, 1 = read) */
	61	int ds;                           /* density select */
	62	int soe;                        /* s? output enable */
	63	int byte;                        /* byte ready */
	64	int mode;                        /* mode (0 = write, 1 = read) */
62	65
63	66	/* devices */
64	67	running_device *cpu;
r7260	r7261
140	143	c1551_port_r - M6510T port read
141	144	-------------------------------------------------*/
142	145
	146	static void read_current_track(c1551_t *c1551)
	147	{
	148	c1551->track_len = G64_BUFFER_SIZE;
	149	c1551->buffer_pos = G64_DATA_START;
	150	c1551->bit_pos = 7;
	151	c1551->bit_count = 0;
	152
	153	/* read track data */
	154	floppy_drive_read_track_data_info_buffer(c1551->image, 0, c1551->track_buffer, &c1551->track_len);
	155
	156	/* extract track length */
	157	c1551->track_len = G64_DATA_START + ((c1551->track_buffer[1] << 8) | c1551->track_buffer[0]);
	158	}
	159
	160	static void spindle_motor(c1551_t *c1551, int mtr)
	161	{
	162	if (c1551->mtr != mtr)
	163	{
	164	if (mtr)
	165	{
	166	/* read track data */
	167	read_current_track(c1551);
	168	}
	169
	170	floppy_mon_w(c1551->image, !mtr);
	171	timer_enable(c1551->bit_timer, mtr);
	172
	173	c1551->mtr = mtr;
	174	}
	175	}
	176
	177	static void step_motor(c1551_t *c1551, int stp)
	178	{
	179	if (c1551->stp != stp)
	180	{
	181	int tracks = 0;
	182
	183	switch (c1551->stp)
	184	{
	185	case 0:   if (stp == 1) tracks++; else if (stp == 3) tracks--; break;
	186	case 1:   if (stp == 2) tracks++; else if (stp == 0) tracks--; break;
	187	case 2: if (stp == 3) tracks++; else if (stp == 1) tracks--; break;
	188	case 3: if (stp == 0) tracks++; else if (stp == 2) tracks--; break;
	189	}
	190
	191	if (tracks != 0)
	192	{
	193	/* step read/write head */
	194	floppy_drive_seek(c1551->image, tracks);
	195
	196	/* read new track data */
	197	read_current_track(c1551);
	198	}
	199
	200	c1551->stp = stp;
	201	}
	202	}
	203
143	204	static READ8_DEVICE_HANDLER( c1551_port_r )
144	205	{
145	206	/*
146	207
147	208	bit     description
148	209
149		P0      STEP0
150		P1      STEP1
151		P2      MOTOR ON
152		P3      ACT
153		P4      WPRT
	210	P0      STP0A
	211	P1      STP0B
	212	P2      MTR0
	213	P3      ACT0
	214	P4      WPS
154	215	P5      DS0
155	216	P6      DS1
156		P7      BYTE READY
	217	P7      BYTE LTCHED
157	218
158	219	*/
159	220
r7260	r7261
163	224	/* write protect sense */
164	225	data |= !floppy_wpt_r(c1551->image) << 4;
165	226
166		/* byte ready */
	227	/* byte latched */
167	228	data |= !(c1551->soe && c1551->byte) << 7;
168	229
169	230	return data;
r7260	r7261
179	240
180	241	bit     description
181	242
182		P0      STEP0
183		P1      STEP1
184		P2      MOTOR ON
185		P3      ACT
186		P4      WPRT
	243	P0      STP0A
	244	P1      STP0B
	245	P2      MTR0
	246	P3      ACT0
	247	P4      WPS
187	248	P5      DS0
188	249	P6      DS1
189		P7      BYTE READY
	250	P7      BYTE LTCHED
190	251
191	252	*/
192	253
193	254	c1551_t *c1551 = get_safe_token(device->owner);
194	255
	256	/* stepper motor */
195	257	int stp = data & 0x03;
196		int ds = (data >> 5) & 0x03;
197		int mtr = BIT(data, 2);
	258	step_motor(c1551, stp);
198	259
199		/* stepper motor */
200		if (c1551->stp != stp)
201		{
202		int tracks = 0;
203
204		switch (c1551->stp)
205		{
206		case 0:   if (stp == 1) tracks++; else if (stp == 3) tracks--; break;
207		case 1:   if (stp == 2) tracks++; else if (stp == 0) tracks--; break;
208		case 2: if (stp == 3) tracks++; else if (stp == 1) tracks--; break;
209		case 3: if (stp == 0) tracks++; else if (stp == 2) tracks--; break;
210		}
211
212		if (tracks != 0)
213		{
214		c1551->track_len = G64_BUFFER_SIZE;
215		c1551->buffer_pos = G64_DATA_START;
216		c1551->bit_pos = 7;
217		c1551->bit_count = 0;
218
219		/* step read/write head */
220		floppy_drive_seek(c1551->image, tracks);
221
222		/* read track data */
223		floppy_drive_read_track_data_info_buffer(c1551->image, 0, c1551->track_buffer, &c1551->track_len);
224
225		/* extract track length */
226		c1551->track_len = G64_DATA_START + ((c1551->track_buffer[1] << 8) | c1551->track_buffer[0]);
227		}
228
229		c1551->stp = stp;
230		}
231
232	260	/* spindle motor */
233		floppy_mon_w(c1551->image, !mtr);
234		timer_enable(c1551->bit_timer, mtr);
	261	int mtr = BIT(data, 2);
	262	spindle_motor(c1551, mtr);
235	263
236	264	/* activity LED */
237	265
238	266	/* density select */
	267	int ds = (data >> 5) & 0x03;
	268
239	269	if (c1551->ds != ds)
240	270	{
241	271	timer_adjust_periodic(c1551->bit_timer, attotime_zero, 0, ATTOTIME_IN_HZ(C2040_BITRATE[ds]/4));
r7260	r7261
264	294
265	295	bit     description
266	296
267		PA0     6523 P0
268		PA1     6523 P1
269		PA2     6523 P2
270		PA3     6523 P3
271		PA4     6523 P4
272		PA5     6523 P5
273		PA6     6523 P6
274		PA7     6523 P7
	297	PA0     TCBM PA0
	298	PA1     TCBM PA1
	299	PA2     TCBM PA2
	300	PA3     TCBM PA3
	301	PA4     TCBM PA4
	302	PA5     TCBM PA5
	303	PA6     TCBM PA6
	304	PA7     TCBM PA7
275	305
276	306	*/
277	307
r7260	r7261
284	314
285	315	bit     description
286	316
287		PA0     6523 P0
288		PA1     6523 P1
289		PA2     6523 P2
290		PA3     6523 P3
291		PA4     6523 P4
292		PA5     6523 P5
293		PA6     6523 P6
294		PA7     6523 P7
	317	PA0     TCBM PA0
	318	PA1     TCBM PA1
	319	PA2     TCBM PA2
	320	PA3     TCBM PA3
	321	PA4     TCBM PA4
	322	PA5     TCBM PA5
	323	PA6     TCBM PA6
	324	PA7     TCBM PA7
295	325
296	326	*/
297	327	}
r7260	r7261
346	376
347	377	bit     description
348	378
349		PC0     6523 _IRQ
350		PC1     6523 _RES
351		PC2     interface J1
352		PC3     6523 pin 20
353		PC4     SOE
	379	PC0     TCBM STATUS0
	380	PC1     TCBM STATUS1
	381	PC2     TCBM DEV
	382	PC3     TCBM ACK
	383	PC4     MODE
354	384	PC5     JP1
355	385	PC6     _SYNC
356		PC7     6523 phi2
	386	PC7     TCBM DAV
357	387
358	388	*/
359	389
r7260	r7261
372	402
373	403	bit     description
374	404
375		PC0     6523 _IRQ
376		PC1     6523 _RES
377		PC2     interface J1
378		PC3     6523 pin 20
379		PC4     SOE
	405	PC0     TCBM STATUS0
	406	PC1     TCBM STATUS1
	407	PC2     TCBM DEV
	408	PC3     TCBM ACK
	409	PC4     MODE
380	410	PC5     JP1
381	411	PC6     _SYNC
382		PC7     6523 phi2
	412	PC7     TCBM DAV
383	413
384	414	*/
385	415
r7260	r7261
445	475	ROM( c1551 )
446	476	-------------------------------------------------*/
447	477
448		ROM_START( c1551 )
	478	ROM_START( c1551 ) // schematic 251860
449	479	ROM_REGION( 0x4000, "c1551", ROMREGION_LOADBYNAME )
450	480	ROM_LOAD( "318001-01.u4", 0x0000, 0x4000, CRC(6d16d024) SHA1(fae3c788ad9a6cc2dbdfbcf6c0264b2ca921d55e) )
451	481	ROM_END
r7260	r7261
481	511	state_save_register_device_item(device, 0, c1551->data);
482	512	state_save_register_device_item(device, 0, c1551->yb);
483	513	state_save_register_device_item(device, 0, c1551->byte);
484		state_save_register_device_item(device, 0, c1551->atna);
485	514	state_save_register_device_item(device, 0, c1551->ds);
486	515	state_save_register_device_item(device, 0, c1551->stp);
487	516	state_save_register_device_item(device, 0, c1551->soe);

src/mess/machine/c1571.c

r7260	r7261
50	50	typedef struct _c1571_t c1571_t;
51	51	struct _c1571_t
52	52	{
53		/* abstractions */
54		int address;                  /* device number */
55		UINT8 track_buffer[G64_BUFFER_SIZE];            /* track data buffer */
56		int track_len;                  /* track length */
57		int buffer_pos;                  /* current byte position within track buffer */
58		int bit_pos;                  /* current bit position within track buffer byte */
59		int bit_count;                  /* current data byte bit counter */
60		UINT16 data;                  /* data shift register */
	53	/* IEC bus */
	54	int address;                     /* device number */
	55	int data_out;                     /* serial data out */
	56	int atn_ack;                     /* attention acknowledge */
	57	int ser_dir;                     /* fast serial direction */
	58	int sp_out;                        /* fast serial data out */
	59	int cnt_out;                     /* fast serial clock out */
61	60
	61	/* motors */
	62	int stp;                        /* stepper motor phase */
	63	int mtr;                        /* spindle motor on */
	64
	65	/* track */
	66	UINT8 track_buffer[G64_BUFFER_SIZE];   /* track data buffer */
	67	int track_len;                     /* track length */
	68	int buffer_pos;                     /* current byte position within track buffer */
	69	int bit_pos;                     /* current bit position within track buffer byte */
	70	int bit_count;                     /* current data byte bit counter */
	71	UINT16 data;                     /* data shift register */
	72	UINT8 yb;                        /* GCR data byte to write */
	73
62	74	/* signals */
63		UINT8 yb;                     /* GCR data byte to write */
64		int byte;                     /* byte ready */
65		int atna;                     /* attention acknowledge */
66		int ds;                        /* density select */
67		int stp;                     /* stepping motor */
68		int soe;                     /* s? output enable */
69		int mode;                     /* mode (0 = write, 1 = read) */
70		int side;                     /* disk side select */
	75	int ds;                           /* density select */
	76	int soe;                        /* s? output enable */
	77	int byte;                        /* byte ready */
	78	int mode;                        /* mode (0 = write, 1 = read) */
	79	int side;                        /* disk side select */
71	80
72		int data_out;                  /* serial data out */
73		int atn_ack;                  /* attention acknowledge */
74		int ser_dir;                  /* fast serial direction */
75		int sp_out;                     /* fast serial data out */
76		int cnt_out;                  /* fast serial clock out */
77
78	81	/* interrupts */
79		int via0_irq;                  /* VIA #0 interrupt request */
80		int via1_irq;                  /* VIA #1 interrupt request */
81		int cia_irq;                  /* CIA interrupt request */
	82	int via0_irq;                     /* VIA #0 interrupt request */
	83	int via1_irq;                     /* VIA #1 interrupt request */
	84	int cia_irq;                     /* CIA interrupt request */
82	85
83	86	/* devices */
84	87	running_device *cpu;
r7260	r7261
462	465	via6522_interface c1571_via1_intf
463	466	-------------------------------------------------*/
464	467
	468	static void read_current_track(c1571_t *c1571)
	469	{
	470	c1571->track_len = G64_BUFFER_SIZE;
	471	c1571->buffer_pos = G64_DATA_START;
	472	c1571->bit_pos = 7;
	473	c1571->bit_count = 0;
	474
	475	/* read track data */
	476	floppy_drive_read_track_data_info_buffer(c1571->image, c1571->side, c1571->track_buffer, &c1571->track_len);
	477
	478	/* extract track length */
	479	c1571->track_len = G64_DATA_START + ((c1571->track_buffer[1] << 8) | c1571->track_buffer[0]);
	480	}
	481
	482	static void spindle_motor(c1571_t *c1571, int mtr)
	483	{
	484	if (c1571->mtr != mtr)
	485	{
	486	if (mtr)
	487	{
	488	/* read track data */
	489	read_current_track(c1571);
	490	}
	491
	492	floppy_mon_w(c1571->image, !mtr);
	493	timer_enable(c1571->bit_timer, mtr);
	494
	495	c1571->mtr = mtr;
	496	}
	497	}
	498
	499	static void step_motor(c1571_t *c1571, int stp)
	500	{
	501	if (c1571->stp != stp)
	502	{
	503	int tracks = 0;
	504
	505	switch (c1571->stp)
	506	{
	507	case 0:   if (stp == 1) tracks++; else if (stp == 3) tracks--; break;
	508	case 1:   if (stp == 2) tracks++; else if (stp == 0) tracks--; break;
	509	case 2: if (stp == 3) tracks++; else if (stp == 1) tracks--; break;
	510	case 3: if (stp == 0) tracks++; else if (stp == 2) tracks--; break;
	511	}
	512
	513	if (tracks != 0)
	514	{
	515	/* step read/write head */
	516	floppy_drive_seek(c1571->image, tracks);
	517
	518	/* read new track data */
	519	read_current_track(c1571);
	520	}
	521
	522	c1571->stp = stp;
	523	}
	524	}
	525
465	526	static WRITE_LINE_DEVICE_HANDLER( via1_irq_w )
466	527	{
467	528	c1571_t *c1571 = get_safe_token(device->owner);
r7260	r7261
558	619	*/
559	620
560	621	c1571_t *c1571 = get_safe_token(device->owner);
561		int stp = data & 0x03;
562		int ds = (data >> 5) & 0x03;
563		int mtr = BIT(data, 2);
564	622
565	623	/* stepper motor */
566		if (c1571->stp != stp)
567		{
568		int tracks = 0;
	624	int stp = data & 0x03;
	625	step_motor(c1571, stp);
569	626
570		switch (c1571->stp)
571		{
572		case 0:   if (stp == 1) tracks++; else if (stp == 3) tracks--; break;
573		case 1:   if (stp == 2) tracks++; else if (stp == 0) tracks--; break;
574		case 2: if (stp == 3) tracks++; else if (stp == 1) tracks--; break;
575		case 3: if (stp == 0) tracks++; else if (stp == 2) tracks--; break;
576		}
577
578		if (tracks != 0)
579		{
580		c1571->track_len = G64_BUFFER_SIZE;
581		c1571->buffer_pos = G64_DATA_START;
582		c1571->bit_pos = 7;
583		c1571->bit_count = 0;
584
585		/* step read/write head */
586		floppy_drive_seek(c1571->image, tracks);
587
588		/* read track data */
589		floppy_drive_read_track_data_info_buffer(c1571->image, c1571->side, c1571->track_buffer, &c1571->track_len);
590
591		/* extract track length */
592		c1571->track_len = G64_DATA_START + ((c1571->track_buffer[1] << 8) | c1571->track_buffer[0]);
593		}
594
595		c1571->stp = stp;
596		}
597
598	627	/* spindle motor */
599		floppy_mon_w(c1571->image, !mtr);
600		timer_enable(c1571->bit_timer, mtr);
	628	int mtr = BIT(data, 2);
	629	spindle_motor(c1571, mtr);
601	630
602	631	/* activity LED */
603	632
604	633	/* density select */
	634	int ds = (data >> 5) & 0x03;
	635
605	636	if (c1571->ds != ds)
606	637	{
607	638	timer_adjust_periodic(c1571->bit_timer, attotime_zero, 0, ATTOTIME_IN_HZ(C2040_BITRATE[ds]/4));

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