summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/s100/polyvti.cpp
blob: 242d13a8fe2a97df876bc6d06632077617b08663 (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
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic, AJR
/***************************************************************************

    PolyMorphic Systems Video Terminal Interface

    Original implementation by Miodrag Milanovic
    Converted to S-100 bus device by AJR

    This video and keyboard interface board was a primary component of
    PolyMorphic's System 88, but was also sold for use in other S-100
    systems.

    Any generic keyboard with a parallel ASCII interface can be used.
    The actual keyboard provided by PolyMorphic Systems is almost entirely
    based on TTL/LSTTL components.

    The video timing circuit has no fixed dot clock, which is instead
    generated by a VCO connected to a user-adjustable potentiometer. The
    blanking and sync frequencies, on the other hand, are divisions of
    either pin 49 of the S-100 bus or an optionally installable 2 MHz XTAL.

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

#include "emu.h"
#include "polyvti.h"

#include "machine/i8212.h"
#include "machine/keyboard.h"
#include "emupal.h"
#include "screen.h"

class poly_vti_device : public device_t, public device_s100_card_interface
{
	static const u8 s_mcm6571a_shift[];

public:
	// construction/destruction
	poly_vti_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);

protected:
	// device-level overrides
	virtual void device_start() override;
	virtual ioport_constructor device_input_ports() const override;
	virtual void device_add_mconfig(machine_config &config) override;
	virtual const tiny_rom_entry *device_rom_region() const override;

	// device_s100_card_interface overrides
	virtual u8 s100_smemr_r(offs_t offset) override;
	virtual void s100_mwrt_w(offs_t offset, u8 data) override;
	virtual u8 s100_sinp_r(offs_t offset) override;

private:
	u32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);

	void kbd_put(u8 data);
	DECLARE_WRITE_LINE_MEMBER(kbd_int_w);

	// object finders
	required_device<i8212_device> m_kbdlatch;
	required_region_ptr<u8> m_FNT;
	required_ioport m_address;

	// internal state
	std::unique_ptr<u8[]> m_video_ram;
	bool m_kbd_int;
	bool m_kbd_stb;
};

DEFINE_DEVICE_TYPE_PRIVATE(S100_POLY_VTI, device_s100_card_interface, poly_vti_device, "polyvti", "PolyMorphic Systems Video Terminal Interface")

poly_vti_device::poly_vti_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
	: device_t(mconfig, S100_POLY_VTI, tag, owner, clock)
	, device_s100_card_interface(mconfig, *this)
	, m_kbdlatch(*this, "kbdlatch")
	, m_FNT(*this, "chargen")
	, m_address(*this, "ADDRESS")
{
}

void poly_vti_device::device_start()
{
	m_kbd_int = true;
	m_kbd_stb = false; // TODO: 8212 strobe input

	m_video_ram = make_unique_clear<u8[]>(0x400);
	save_pointer(NAME(m_video_ram), 0x400);
	save_item(NAME(m_kbd_int));
	save_item(NAME(m_kbd_stb));
}

const u8 poly_vti_device::s_mcm6571a_shift[] =
{
	0,1,1,0,0,0,1,0,0,0,0,1,0,0,0,0,
	1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,
	0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,
	0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,
	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
	0,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0,
	1,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0
};

u32 poly_vti_device::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	for (int y = 0; y < 16; y++)
	{
		u16 addr = y*64;
		int xpos = 0;
		for (int x = 0; x < 64; x++)
		{
			u8 code = m_video_ram[addr + x];
			if ((code & 0x80)==0)
			{
				for (int j = 0; j < 15; j++)
				{
					u8 l = j/5;
					for (int b = 0; b < 10; b++)
					{
						u8 r = b/5;
						if (l==0 && r==0)
							bitmap.pix(y*15+j, xpos+b ) = BIT(code,5) ? 0 : 1;

						if (l==0 && r==1)
							bitmap.pix(y*15+j, xpos+b ) = BIT(code,2) ? 0 : 1;

						if (l==1 && r==0)
							bitmap.pix(y*15+j, xpos+b ) = BIT(code,4) ? 0 : 1;

						if (l==1 && r==1)
							bitmap.pix(y*15+j, xpos+b ) = BIT(code,1) ? 0 : 1;

						if (l==2 && r==0)
							bitmap.pix(y*15+j, xpos+b ) = BIT(code,3) ? 0 : 1;

						if (l==2 && r==1)
							bitmap.pix(y*15+j, xpos+b ) = BIT(code,0) ? 0 : 1;
					}
				}
			}
			else
			{
				for (int j = 0; j < 15; j++)
				{
					code &= 0x7f;
					int l = 0;
					if (s_mcm6571a_shift[code]==0)
					{
						if (j < 9)
							l = m_FNT[code*16 + j];
					}
					else
					{
						if ((j > 2) && (j < 12))
							l = m_FNT[code*16 + j - 3];
					}

					for (int b = 0; b < 7; b++)
						bitmap.pix(y*15+j, xpos+b ) =  (l >> (6-b)) & 1;

					bitmap.pix(y*15+j, xpos+7 ) =  0;
					bitmap.pix(y*15+j, xpos+8 ) =  0;
					bitmap.pix(y*15+j, xpos+9 ) =  0;
				}
			}
			xpos += 10;
		}
	}
	return 0;
}

u8 poly_vti_device::s100_smemr_r(offs_t offset)
{
	if ((offset & 0xfc00) >> 10 == m_address->read())
		return m_video_ram[offset & 0x3ff];

	return 0xff;
}

void poly_vti_device::s100_mwrt_w(offs_t offset, u8 data)
{
	if ((offset & 0xfc00) >> 10 == m_address->read())
		m_video_ram[offset & 0x3ff] = data;
}

u8 poly_vti_device::s100_sinp_r(offs_t offset)
{
	if ((offset & 0xfc00) >> 10 == m_address->read())
	{
		if (BIT(offset, 0))
			return m_kbd_stb << 7 | 0x7e | m_kbd_int;
		else
			return m_kbdlatch->read();
	}

	return 0xff;
}

void poly_vti_device::kbd_put(u8 data)
{
	if (data)
	{
		if (data==8)
			data=127;  // fix backspace
		m_kbdlatch->strobe(data);
	}
}

WRITE_LINE_MEMBER(poly_vti_device::kbd_int_w)
{
	m_kbd_int = !state;

	// TODO: jumper selectable
	m_bus->vi2_w(state);
}

static INPUT_PORTS_START(polyvti)
	PORT_START("ADDRESS")
	PORT_DIPNAME(0x3f, 0x3e, "Address Range") PORT_DIPLOCATION("SW:2,3,4,5,6,7")
	PORT_DIPSETTING(0x00, "0000-03FF")
	PORT_DIPSETTING(0x01, "0400-07FF")
	PORT_DIPSETTING(0x02, "0800-0BFF")
	PORT_DIPSETTING(0x03, "0C00-0FFF")
	PORT_DIPSETTING(0x04, "1000-13FF")
	PORT_DIPSETTING(0x05, "1400-17FF")
	PORT_DIPSETTING(0x06, "1800-1BFF")
	PORT_DIPSETTING(0x07, "1C00-1FFF")
	PORT_DIPSETTING(0x08, "2000-23FF")
	PORT_DIPSETTING(0x09, "2400-27FF")
	PORT_DIPSETTING(0x0a, "2800-2BFF")
	PORT_DIPSETTING(0x0b, "2C00-2FFF")
	PORT_DIPSETTING(0x0c, "3000-33FF")
	PORT_DIPSETTING(0x0d, "3400-37FF")
	PORT_DIPSETTING(0x0e, "3800-3BFF")
	PORT_DIPSETTING(0x0f, "3C00-3FFF")
	PORT_DIPSETTING(0x10, "4000-43FF")
	PORT_DIPSETTING(0x11, "4400-47FF")
	PORT_DIPSETTING(0x12, "4800-4BFF")
	PORT_DIPSETTING(0x13, "4C00-4FFF")
	PORT_DIPSETTING(0x14, "5000-53FF")
	PORT_DIPSETTING(0x15, "5400-57FF")
	PORT_DIPSETTING(0x16, "5800-5BFF")
	PORT_DIPSETTING(0x17, "5C00-5FFF")
	PORT_DIPSETTING(0x18, "6000-63FF")
	PORT_DIPSETTING(0x19, "6400-67FF")
	PORT_DIPSETTING(0x1a, "6800-6BFF")
	PORT_DIPSETTING(0x1b, "6C00-6FFF")
	PORT_DIPSETTING(0x1c, "7000-73FF")
	PORT_DIPSETTING(0x1d, "7400-77FF")
	PORT_DIPSETTING(0x1e, "7800-7BFF")
	PORT_DIPSETTING(0x1f, "7C00-7FFF")
	PORT_DIPSETTING(0x20, "8000-83FF")
	PORT_DIPSETTING(0x21, "8400-87FF")
	PORT_DIPSETTING(0x22, "8800-8BFF")
	PORT_DIPSETTING(0x23, "8C00-8FFF")
	PORT_DIPSETTING(0x24, "9000-93FF")
	PORT_DIPSETTING(0x25, "9400-97FF")
	PORT_DIPSETTING(0x26, "9800-9BFF")
	PORT_DIPSETTING(0x27, "9C00-9FFF")
	PORT_DIPSETTING(0x28, "A000-A3FF")
	PORT_DIPSETTING(0x29, "A400-A7FF")
	PORT_DIPSETTING(0x2a, "A800-ABFF")
	PORT_DIPSETTING(0x2b, "AC00-AFFF")
	PORT_DIPSETTING(0x2c, "B000-B3FF")
	PORT_DIPSETTING(0x2d, "B400-B7FF")
	PORT_DIPSETTING(0x2e, "B800-BBFF")
	PORT_DIPSETTING(0x2f, "BC00-BFFF")
	PORT_DIPSETTING(0x30, "C000-C3FF")
	PORT_DIPSETTING(0x31, "C400-C7FF")
	PORT_DIPSETTING(0x32, "C800-CBFF")
	PORT_DIPSETTING(0x33, "CC00-CFFF")
	PORT_DIPSETTING(0x34, "D000-D3FF")
	PORT_DIPSETTING(0x35, "D400-D7FF")
	PORT_DIPSETTING(0x36, "D800-DBFF")
	PORT_DIPSETTING(0x37, "DC00-DFFF")
	PORT_DIPSETTING(0x38, "E000-E3FF")
	PORT_DIPSETTING(0x39, "E400-E7FF")
	PORT_DIPSETTING(0x3a, "E800-EBFF")
	PORT_DIPSETTING(0x3b, "EC00-EFFF")
	PORT_DIPSETTING(0x3c, "F000-F3FF")
	PORT_DIPSETTING(0x3d, "F400-F7FF")
	PORT_DIPSETTING(0x3e, "F800-FBFF")
	PORT_DIPSETTING(0x3f, "FC00-FFFF")

	PORT_START("UNUSED")
	PORT_DIPNAME(1, 1, DEF_STR(Unused)) PORT_DIPLOCATION("SW:1")
	PORT_DIPSETTING(1, DEF_STR(Off))
	PORT_DIPSETTING(0, DEF_STR(On))
INPUT_PORTS_END

ioport_constructor poly_vti_device::device_input_ports() const
{
	return INPUT_PORTS_NAME(polyvti);
}

/* F4 Character Displayer */
static const gfx_layout vti_charlayout =
{
	8, 16,                  /* text = 7 x 9 */
	128,                    /* 128 characters */
	1,                  /* 1 bits per pixel */
	{ 0 },                  /* no bitplanes */
	/* x offsets */
	{ 0, 1, 2, 3, 4, 5, 6, 7 },
	/* y offsets */
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
	8*16                    /* every char takes 16 bytes */
};

static GFXDECODE_START(gfx_vti)
	GFXDECODE_ENTRY("chargen", 0x0000, vti_charlayout, 0, 1)
GFXDECODE_END

void poly_vti_device::device_add_mconfig(machine_config &config)
{
	screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
	screen.set_refresh_hz(60);
	screen.set_vblank_time(ATTOSECONDS_IN_USEC(2500)); /* not accurate */
	screen.set_size(64*10, 16*15);
	screen.set_visarea(0, 64*10-1, 0, 16*15-1);
	screen.set_screen_update(FUNC(poly_vti_device::screen_update));
	screen.set_palette("palette");

	GFXDECODE(config, "gfxdecode", "palette", gfx_vti);
	PALETTE(config, "palette", palette_device::MONOCHROME);

	generic_keyboard_device &keyboard(GENERIC_KEYBOARD(config, "keyboard", 0));
	keyboard.set_keyboard_callback(FUNC(poly_vti_device::kbd_put));

	I8212(config, m_kbdlatch);
	m_kbdlatch->md_rd_callback().set_constant(0);
	m_kbdlatch->int_wr_callback().set(FUNC(poly_vti_device::kbd_int_w));
}

ROM_START(polyvti)
	ROM_REGION(0x800, "chargen", 0)
	ROM_LOAD("6571.bin", 0x0000, 0x0800, CRC(5a25144b) SHA1(7b9fee0c8ef2605b85d12b6d9fe8feb82418c63a))
ROM_END

const tiny_rom_entry *poly_vti_device::device_rom_region() const
{
	return ROM_NAME(polyvti);
}