summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/nubus/nubus_m2hires.cpp
blob: 851537685d23dd7c5d9d889cc5108e58ea837ac2 (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
301
302
303
304
305
// license:BSD-3-Clause
// copyright-holders:R. Belmont
/***************************************************************************

  Apple Hi-Resolution Video Card emulation

  RAMDAC: control at Fs0940e0, data at Fs0940e4
  Fs090010 bit 16 is vbl status, bit 17 must be "1" for proper operation
  Fs08000x are the control registers

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

#include "emu.h"
#include "nubus_m2hires.h"
#include "screen.h"

#define M2HIRES_SCREEN_NAME "m2hires_screen"
#define M2HIRES_ROM_REGION  "m2hires_rom"

#define VRAM_SIZE   (0x80000)   // 512k max


ROM_START( m2hires )
	ROM_REGION(0x2000, M2HIRES_ROM_REGION, 0)
	ROM_LOAD( "341-0660.bin", 0x0000, 0x2000, CRC(ea6f7913) SHA1(37c59f38ae34021d0cb86c2e76a598b7e6077c0d) )
ROM_END

//**************************************************************************
//  GLOBAL VARIABLES
//**************************************************************************

DEFINE_DEVICE_TYPE(NUBUS_M2HIRES, nubus_m2hires_device, "nb_m2hr", "Macintosh II Hi-Resolution video card")


//-------------------------------------------------
//  device_add_mconfig - add device configuration
//-------------------------------------------------

void nubus_m2hires_device::device_add_mconfig(machine_config &config)
{
	screen_device &screen(SCREEN(config, M2HIRES_SCREEN_NAME, SCREEN_TYPE_RASTER));
	screen.set_screen_update(FUNC(nubus_m2hires_device::screen_update));
	screen.set_raw(25175000, 800, 0, 640, 525, 0, 480);
	screen.set_size(1024, 768);
	screen.set_visarea(0, 640-1, 0, 480-1);
}

//-------------------------------------------------
//  rom_region - device-specific ROM region
//-------------------------------------------------

const tiny_rom_entry *nubus_m2hires_device::device_rom_region() const
{
	return ROM_NAME( m2hires );
}

//**************************************************************************
//  LIVE DEVICE
//**************************************************************************

//-------------------------------------------------
//  nubus_m2hires_device - constructor
//-------------------------------------------------

nubus_m2hires_device::nubus_m2hires_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
	nubus_m2hires_device(mconfig, NUBUS_M2HIRES, tag, owner, clock)
{
}

nubus_m2hires_device::nubus_m2hires_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) :
	device_t(mconfig, type, tag, owner, clock),
	device_video_interface(mconfig, *this),
	device_nubus_card_interface(mconfig, *this),
	m_vram32(nullptr), m_mode(0), m_vbl_disable(0), m_toggle(0), m_count(0), m_clutoffs(0), m_timer(nullptr)
{
	set_screen(*this, M2HIRES_SCREEN_NAME);
}

//-------------------------------------------------
//  device_start - device-specific startup
//-------------------------------------------------

void nubus_m2hires_device::device_start()
{
	uint32_t slotspace;

	install_declaration_rom(this, M2HIRES_ROM_REGION, true);

	slotspace = get_slotspace();

//  logerror("[m2hires %p] slotspace = %x\n", this, slotspace);

	m_vram.resize(VRAM_SIZE);
	m_vram32 = (uint32_t *)&m_vram[0];

	nubus().install_device(slotspace, slotspace+VRAM_SIZE-1, read32s_delegate(*this, FUNC(nubus_m2hires_device::vram_r)), write32s_delegate(*this, FUNC(nubus_m2hires_device::vram_w)));
	nubus().install_device(slotspace+0x900000, slotspace+VRAM_SIZE-1+0x900000, read32s_delegate(*this, FUNC(nubus_m2hires_device::vram_r)), write32s_delegate(*this, FUNC(nubus_m2hires_device::vram_w)));
	nubus().install_device(slotspace+0x80000, slotspace+0xeffff, read32s_delegate(*this, FUNC(nubus_m2hires_device::m2hires_r)), write32s_delegate(*this, FUNC(nubus_m2hires_device::m2hires_w)));

	m_timer = timer_alloc(0, nullptr);
	m_timer->adjust(screen().time_until_pos(479, 0), 0);
}

//-------------------------------------------------
//  device_reset - device-specific reset
//-------------------------------------------------

void nubus_m2hires_device::device_reset()
{
	m_count = 0;
	m_clutoffs = 0;
	m_vbl_disable = 1;
	m_mode = 0;
	memset(&m_vram[0], 0, VRAM_SIZE);
	memset(m_palette, 0, sizeof(m_palette));

	m_palette[0] = rgb_t(255, 255, 255);
	m_palette[0x80] = rgb_t(0, 0, 0);
}


void nubus_m2hires_device::device_timer(emu_timer &timer, device_timer_id tid, int param, void *ptr)
{
	if (!m_vbl_disable)
	{
		raise_slot_irq();
	}

	m_timer->adjust(screen().time_until_pos(479, 0), 0);
}

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

  Spectrum 24 PDQ section

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

uint32_t nubus_m2hires_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
	uint32_t *scanline;
	int x, y;
	uint8_t pixels, *vram;

	vram = &m_vram[0x20];

	switch (m_mode)
	{
		case 0: // 1 bpp?
			for (y = 0; y < 480; y++)
			{
				scanline = &bitmap.pix32(y);
				for (x = 0; x < 640/8; x++)
				{
					pixels = vram[(y * 128) + (BYTE4_XOR_BE(x))];

					*scanline++ = m_palette[((pixels>>7)&0x1)];
					*scanline++ = m_palette[((pixels>>6)&0x1)];
					*scanline++ = m_palette[((pixels>>5)&0x1)];
					*scanline++ = m_palette[((pixels>>4)&0x1)];
					*scanline++ = m_palette[((pixels>>3)&0x1)];
					*scanline++ = m_palette[((pixels>>2)&0x1)];
					*scanline++ = m_palette[((pixels>>1)&0x1)];
					*scanline++ = m_palette[(pixels&1)];
				}
			}
			break;

		case 1: // 2 bpp
			for (y = 0; y < 480; y++)
			{
				scanline = &bitmap.pix32(y);
				for (x = 0; x < 640/4; x++)
				{
					pixels = vram[(y * 256) + (BYTE4_XOR_BE(x))];

					*scanline++ = m_palette[((pixels>>6)&3)];
					*scanline++ = m_palette[((pixels>>4)&3)];
					*scanline++ = m_palette[((pixels>>2)&3)];
					*scanline++ = m_palette[(pixels&3)];
				}
			}
			break;

		case 2: // 4 bpp
			for (y = 0; y < 480; y++)
			{
				scanline = &bitmap.pix32(y);

				for (x = 0; x < 640/2; x++)
				{
					pixels = vram[(y * 512) + (BYTE4_XOR_BE(x))];

					*scanline++ = m_palette[((pixels&0xf0)>>4)];
					*scanline++ = m_palette[(pixels&0xf)];
				}
			}
			break;

		case 3: // 8 bpp
			for (y = 0; y < 480; y++)
			{
				scanline = &bitmap.pix32(y);

				for (x = 0; x < 640; x++)
				{
					pixels = vram[(y * 1024) + (BYTE4_XOR_BE(x))];
					*scanline++ = m_palette[pixels];
				}
			}
			break;

		default:
			fatalerror("m2hires: unknown video mode %d\n", m_mode);
	}
	return 0;
}

void nubus_m2hires_device::m2hires_w(offs_t offset, uint32_t data, uint32_t mem_mask)
{
	data ^= 0xffffffff;

	switch (offset)
	{
		case 1:         // mode
			switch (data)
			{
				case 0x20000000:
					m_mode = 0;
					break;

				case 0x40000000:
					m_mode = 1;
					break;

				case 0x80000000:
					m_mode = 2;
					break;

				case 0x00010000:
					m_mode = 3;
					break;
			}
			break;

		case 0x5038:    // DAC control
//          logerror("%08x to DAC control %s\n", data, machine().describe_context());
			m_clutoffs = (data>>24)&0xff;
			break;

		case 0x5039: // DAC data
			m_colors[m_count++] = (data>>24) & 0xff;

			if (m_count == 3)
			{
//              logerror("RAMDAC: color %d = %02x %02x %02x %s\n", m_clutoffs, m_colors[0], m_colors[1], m_colors[2], machine().describe_context() );
				m_palette[m_clutoffs] = rgb_t(m_colors[0], m_colors[1], m_colors[2]);
				m_clutoffs++;
				if (m_clutoffs > 255)
				{
					m_clutoffs = 0;
				}
				m_count = 0;
			}
			break;

		case 0x8000:    // enable and ack VBL
			m_vbl_disable = 0;
			lower_slot_irq();
			break;

		case 0x8001:    // disable VBL
			m_vbl_disable = 1;
			break;

		default:
//          logerror("m2hires_w: %08x @ %x, mask %08x %s\n", data, offset, mem_mask, machine().describe_context());
			break;
	}
}

uint32_t nubus_m2hires_device::m2hires_r(offs_t offset, uint32_t mem_mask)
{
	if (offset == 0x10010/4)
	{
		m_toggle ^= (1<<16);
		return m_toggle | (1<<17);  // bit 17 indicates a 4/8bpp capable ASIC apparently; the firmware won't enter those modes otherwise (although they show in the list)
	}
/*  else
    {
        logerror("m2hires_r: @ %x, mask %08x %s\n", offset, mem_mask, machine().describe_context());
    }*/

	return 0;
}

void nubus_m2hires_device::vram_w(offs_t offset, uint32_t data, uint32_t mem_mask)
{
	data ^= 0xffffffff;
	COMBINE_DATA(&m_vram32[offset]);
}

uint32_t nubus_m2hires_device::vram_r(offs_t offset, uint32_t mem_mask)
{
	return m_vram32[offset] ^ 0xffffffff;
}