summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/heathzenith/h89/z37_fdc.cpp
blob: 41dc53b4b8a0ed7ddfc39db000209da0b9d9bb4d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
// license:BSD-3-Clause
// copyright-holders:Mark Garlanger
/***************************************************************************

  Heathkit Z-37 Floppy controller

    This was an option for both the Heathkit H8 and H89 computer systems.

****************************************************************************/

#include "emu.h"

#include "imagedev/floppy.h"
#include "machine/wd_fdc.h"

#include "z37_fdc.h"

#define LOG_REG (1U << 1)    // Shows register setup
#define LOG_LINES (1U << 2)  // Show control lines
#define LOG_DRIVE (1U << 3)  // Show drive select
#define LOG_FUNC (1U << 4)   // Function calls

#define VERBOSE (0)

#include "logmacro.h"

#define LOGREG(...)        LOGMASKED(LOG_REG, __VA_ARGS__)
#define LOGLINES(...)      LOGMASKED(LOG_LINES, __VA_ARGS__)
#define LOGDRIVE(...)      LOGMASKED(LOG_DRIVE, __VA_ARGS__)
#define LOGFUNC(...)       LOGMASKED(LOG_FUNC, __VA_ARGS__)

#ifdef _MSC_VER
#define FUNCNAME __func__
#else
#define FUNCNAME __PRETTY_FUNCTION__
#endif

namespace {

class h89bus_z37_device : public device_t, public device_h89bus_right_card_interface
{
public:
	h89bus_z37_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0);

	virtual void write(u8 select_lines, u8 offset, u8 data) override;
	virtual u8 read(u8 select_lines, u8 offset) override;

protected:
	virtual void device_start() override ATTR_COLD;
	virtual void device_reset() override ATTR_COLD;
	virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;

	void ctrl_w(u8 val);

	void intf_w(u8 val);

	void cmd_w(u8 val);
	u8 stat_r();

	void data_w(u8 val);
	u8 data_r();

	void set_irq(int state);
	void set_drq(int state);

private:
	required_device<fd1797_device> m_fdc;
	required_device_array<floppy_connector, 4> m_floppies;

	bool m_irq_allowed;
	bool m_drq_allowed;
	bool m_access_track_sector;

	/// Bits set in cmd_ControlPort_c - DK.CON
	static constexpr u8 ctrl_EnableIntReq_c = 0;
	static constexpr u8 ctrl_EnableDrqInt_c = 1;
	static constexpr u8 ctrl_SetMFMRecording_c = 2;
	static constexpr u8 ctrl_MotorsOn_c = 3;
	static constexpr u8 ctrl_Drive_0_c = 4;
	static constexpr u8 ctrl_Drive_1_c = 5;
	static constexpr u8 ctrl_Drive_2_c = 6;
	static constexpr u8 ctrl_Drive_3_c = 7;

	/// Bits to set alternate registers on InterfaceControl_c - DK.INT
	static constexpr u8 if_SelectSectorTrack_c = 0;
};

h89bus_z37_device::h89bus_z37_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock):
	device_t(mconfig, H89BUS_Z37, tag, owner, 0),
	device_h89bus_right_card_interface(mconfig, *this),
	m_fdc(*this, "z37_fdc"),
	m_floppies(*this, "z37_fdc:%u", 0U)
{
}


void h89bus_z37_device::ctrl_w(u8 val)
{
	bool motor_on = bool(BIT(val, ctrl_MotorsOn_c));

	m_irq_allowed = bool(BIT(val, ctrl_EnableIntReq_c));
	m_drq_allowed = bool(BIT(val, ctrl_EnableDrqInt_c));
	m_fdc->dden_w(BIT(~val, ctrl_SetMFMRecording_c));

	LOGREG("%s: motor on: %d, intrq allowed: %d, drq allowed: %d\n",
		FUNCNAME, motor_on, m_irq_allowed, m_drq_allowed);

	if (m_drq_allowed)
	{
		set_slot_blockirq(1);
	}
	else
	{
		set_slot_blockirq(0);
		set_slot_fdcdrq(0);
	}

	if (BIT(val, ctrl_Drive_0_c))
	{
		m_fdc->set_floppy(m_floppies[0]->get_device());
		LOGDRIVE("Drive selected: 0\n");
	}
	else if (BIT(val, ctrl_Drive_1_c))
	{
		m_fdc->set_floppy(m_floppies[1]->get_device());
		LOGDRIVE("Drive selected: 1\n");
	}
	else if (BIT(val, ctrl_Drive_2_c))
	{
		m_fdc->set_floppy(m_floppies[2]->get_device());
		LOGDRIVE("Drive selected: 2\n");
	}
	else if (BIT(val, ctrl_Drive_3_c))
	{
		m_fdc->set_floppy(m_floppies[3]->get_device());
		LOGDRIVE("Drive selected: 3\n");
	}
	else
	{
		m_fdc->set_floppy(nullptr);
		LOGDRIVE("Drive selected: none\n");
	}

	for (auto &elem : m_floppies)
	{
		floppy_image_device *floppy = elem->get_device();
		if (floppy)
		{
			floppy->mon_w(!motor_on);
		}
	}
}

void h89bus_z37_device::intf_w(u8 val)
{
	m_access_track_sector = bool(BIT(val, if_SelectSectorTrack_c));

	LOGREG("access track/sector: %d\n", m_access_track_sector);
}

void h89bus_z37_device::cmd_w(u8 val)
{
	m_access_track_sector ? m_fdc->sector_w(val) : m_fdc->cmd_w(val);
}

u8 h89bus_z37_device::stat_r()
{
	return m_access_track_sector ? m_fdc->sector_r() : m_fdc->status_r();
}

void h89bus_z37_device::data_w(u8 val)
{
	m_access_track_sector ? m_fdc->track_w(val) : m_fdc->data_w(val);
}

u8 h89bus_z37_device::data_r()
{
	return m_access_track_sector ? m_fdc->track_r() : m_fdc->data_r();
}

void h89bus_z37_device::write(u8 select_lines, u8 offset, u8 data)
{
	if (!(select_lines & h89bus_device::H89_CASS))
	{
		return;
	}

	LOGFUNC("%s: reg: %d val: 0x%02x\n", FUNCNAME, offset, data);

	switch (offset)
	{
	case 0:
		ctrl_w(data);
		break;
	case 1:
		intf_w(data);
		break;
	case 2:
		cmd_w(data);
		break;
	case 3:
		data_w(data);
		break;
	}
}

u8 h89bus_z37_device::read(u8 select_lines, u8 offset)
{
	if (!(select_lines & h89bus_device::H89_CASS))
	{
		return 0;
	}

	// default return for the h89
	u8 value = 0xff;

	switch (offset)
	{
	case 0:
	case 1:
		// read not supported on these addresses
		break;
	case 2:
		value = stat_r();
		break;
	case 3:
		value = data_r();
		break;
	}

	LOGFUNC("%s: reg: %d val: 0x%02x\n", FUNCNAME, offset, value);

	return value;
}

void h89bus_z37_device::device_start()
{
	save_item(NAME(m_irq_allowed));
	save_item(NAME(m_drq_allowed));
	save_item(NAME(m_access_track_sector));
}

void h89bus_z37_device::device_reset()
{
	m_irq_allowed         = false;
	m_drq_allowed         = false;
	m_access_track_sector = false;

	set_slot_fdcirq(0);
	set_slot_fdcdrq(0);
	set_slot_blockirq(0);
}

static void z37_floppies(device_slot_interface &device)
{
	// H-17-1 -- SS 48tpi
	device.option_add("ssdd", FLOPPY_525_SSDD);
	// SS 96tpi
	device.option_add("ssqd", FLOPPY_525_SSQD);
	// DS 48tpi
	device.option_add("dd",   FLOPPY_525_DD);
	// H-17-4 / H-17-5 -- DS 96tpi
	device.option_add("qd",   FLOPPY_525_QD);
}

void h89bus_z37_device::device_add_mconfig(machine_config &config)
{
	FD1797(config, m_fdc, 16_MHz_XTAL / 16);
	m_fdc->intrq_wr_callback().set(FUNC(h89bus_z37_device::set_irq));
	m_fdc->drq_wr_callback().set(FUNC(h89bus_z37_device::set_drq));
	// Z-89-37 schematics show the ready line tied high.
	m_fdc->set_force_ready(true);

	FLOPPY_CONNECTOR(config, m_floppies[0], z37_floppies, "qd", floppy_image_device::default_mfm_floppy_formats);
	m_floppies[0]->enable_sound(true);
	FLOPPY_CONNECTOR(config, m_floppies[1], z37_floppies, "qd", floppy_image_device::default_mfm_floppy_formats);
	m_floppies[1]->enable_sound(true);
	FLOPPY_CONNECTOR(config, m_floppies[2], z37_floppies, "qd", floppy_image_device::default_mfm_floppy_formats);
	m_floppies[2]->enable_sound(true);
	FLOPPY_CONNECTOR(config, m_floppies[3], z37_floppies, nullptr, floppy_image_device::default_mfm_floppy_formats);
	m_floppies[3]->enable_sound(true);
}

void h89bus_z37_device::set_irq(int state)
{
	LOGLINES("set irq, allowed: %d state: %d\n", m_irq_allowed, state);

	set_slot_fdcirq(m_irq_allowed ? state : CLEAR_LINE);
}

void h89bus_z37_device::set_drq(int state)
{
	LOGLINES("set drq, allowed: %d state: %d\n", m_drq_allowed, state);

	set_slot_fdcdrq(m_drq_allowed ? state : CLEAR_LINE);
}

}   // anonymous namespace

DEFINE_DEVICE_TYPE_PRIVATE(H89BUS_Z37, device_h89bus_right_card_interface, h89bus_z37_device, "h89_z37", "Heathkit Z-37 Floppy Disk Controller");