summaryrefslogtreecommitdiffstatshomepage
path: root/src/mess/drivers/pasopia.c
blob: e8a1a33123d29c839035505f691874a8b1a2c18f (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
344
345
346
347
348
349
350
351
352
353
354
355
356
357
/***************************************************************************

    Toshiba Pasopia

    TODO:
    - machine emulation needs merging with Pasopia 7 (video emulation is
      completely different tho)

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

#include "emu.h"
#include "cpu/z80/z80.h"
#include "machine/i8255.h"
#include "machine/z80ctc.h"
#include "machine/z80pio.h"
#include "video/mc6845.h"
#include "includes/pasopia.h"

class pasopia_state : public driver_device
{
public:
	pasopia_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_maincpu(*this, "maincpu"),
		m_ppi0(*this, "ppi8255_0"),
		m_ppi1(*this, "ppi8255_1"),
		m_ppi2(*this, "ppi8255_2"),
		m_ctc(*this, "z80ctc"),
		m_pio(*this, "z80pio"),
		m_crtc(*this, "crtc"),
		m_palette(*this, "palette")
	{ }

	required_device<cpu_device> m_maincpu;
	required_device<i8255_device> m_ppi0;
	required_device<i8255_device> m_ppi1;
	required_device<i8255_device> m_ppi2;
	required_device<z80ctc_device> m_ctc;
	required_device<z80pio_device> m_pio;
	required_device<mc6845_device> m_crtc;
	required_device<palette_device> m_palette;

	DECLARE_READ8_MEMBER(pasopia_romram_r);
	DECLARE_WRITE8_MEMBER(pasopia_ram_w);
	DECLARE_WRITE8_MEMBER(pasopia_ctrl_w);
	DECLARE_WRITE8_MEMBER(vram_addr_lo_w);
	DECLARE_WRITE8_MEMBER(vram_latch_w);
	DECLARE_READ8_MEMBER(vram_latch_r);
	DECLARE_READ8_MEMBER(portb_1_r);
	DECLARE_WRITE8_MEMBER(vram_addr_hi_w);
	DECLARE_WRITE8_MEMBER(screen_mode_w);
	DECLARE_READ8_MEMBER(rombank_r);
	DECLARE_READ8_MEMBER(testa_r);
	DECLARE_READ8_MEMBER(testb_r);
	DECLARE_WRITE_LINE_MEMBER(testa_w);
	DECLARE_WRITE_LINE_MEMBER(testb_w);
	DECLARE_WRITE8_MEMBER(kbd_put);
	DECLARE_READ8_MEMBER(mux_r);
	DECLARE_READ8_MEMBER(keyb_r);
	DECLARE_WRITE8_MEMBER(mux_w);
	MC6845_UPDATE_ROW(crtc_update_row);

	UINT8 m_hblank;
	UINT16 m_vram_addr;
	UINT8 m_vram_latch;
	UINT8 m_attr_latch;
//  UINT8 m_gfx_mode;
	UINT8 m_mux_data;
	bool m_video_wl;
	bool m_ram_bank;
	UINT8 *m_p_vram;
	DECLARE_DRIVER_INIT(pasopia);
	TIMER_CALLBACK_MEMBER(pio_timer);
	virtual void machine_start();
	virtual void machine_reset();
	virtual void video_start();
};

// needed to scan the keyboard, as the pio emulation doesn't do it.
TIMER_CALLBACK_MEMBER(pasopia_state::pio_timer)
{
	m_pio->port_b_write(keyb_r(generic_space(),0,0xff));
}

void pasopia_state::video_start()
{
}

MC6845_UPDATE_ROW( pasopia_state::crtc_update_row )
{
	const rgb_t *palette = m_palette->palette()->entry_list_raw();
	UINT8 *m_p_chargen = memregion("chargen")->base();
	UINT8 chr,gfx,fg=7,bg=0; // colours need to be determined
	UINT16 mem,x;
	UINT32 *p = &bitmap.pix32(y);

	for (x = 0; x < x_count; x++)
	{
		UINT8 inv=0;
		if (x == cursor_x) inv=0xff;
		mem = (ma + x) & 0xfff;
		chr = m_p_vram[mem];

		/* get pattern of pixels for that character scanline */
		gfx = m_p_chargen[(chr<<3) | ra] ^ inv;

		/* Display a scanline of a character */
		*p++ = palette[BIT(gfx, 7) ? fg : bg];
		*p++ = palette[BIT(gfx, 6) ? fg : bg];
		*p++ = palette[BIT(gfx, 5) ? fg : bg];
		*p++ = palette[BIT(gfx, 4) ? fg : bg];
		*p++ = palette[BIT(gfx, 3) ? fg : bg];
		*p++ = palette[BIT(gfx, 2) ? fg : bg];
		*p++ = palette[BIT(gfx, 1) ? fg : bg];
		*p++ = palette[BIT(gfx, 0) ? fg : bg];
	}
}

WRITE8_MEMBER( pasopia_state::pasopia_ctrl_w )
{
	m_ram_bank = BIT(data, 1);
	membank("bank1")->set_entry(m_ram_bank);
}

static ADDRESS_MAP_START(pasopia_map, AS_PROGRAM, 8, pasopia_state)
	AM_RANGE(0x0000,0x7fff) AM_READ_BANK("bank1") AM_WRITE_BANK("bank2")
	AM_RANGE(0x8000,0xffff) AM_RAM
ADDRESS_MAP_END


static ADDRESS_MAP_START(pasopia_io, AS_IO, 8, pasopia_state)
	ADDRESS_MAP_UNMAP_HIGH
	ADDRESS_MAP_GLOBAL_MASK(0xff)
	AM_RANGE(0x00,0x03) AM_DEVREADWRITE("ppi8255_0", i8255_device, read, write)
	AM_RANGE(0x08,0x0b) AM_DEVREADWRITE("ppi8255_1", i8255_device, read, write)
	AM_RANGE(0x10,0x10) AM_DEVREADWRITE("crtc", mc6845_device, status_r, address_w)
	AM_RANGE(0x11,0x11) AM_DEVREADWRITE("crtc", mc6845_device, register_r, register_w)
//  0x18 - 0x1b pac2
//  0x1c - 0x1f something
	AM_RANGE(0x20,0x23) AM_DEVREADWRITE("ppi8255_2", i8255_device, read, write)
	AM_RANGE(0x28,0x2b) AM_DEVREADWRITE("z80ctc", z80ctc_device, read, write)
	AM_RANGE(0x30,0x33) AM_DEVREADWRITE("z80pio", z80pio_device, read, write)
//  0x38 printer
	AM_RANGE(0x3c,0x3c) AM_WRITE(pasopia_ctrl_w)
ADDRESS_MAP_END

/* Input ports */
static INPUT_PORTS_START( pasopia )
	PASOPIA_KEYBOARD
INPUT_PORTS_END

void pasopia_state::machine_start()
{
	m_p_vram = memregion("vram")->base();
	m_hblank = 0;
	membank("bank1")->set_entry(0);
	membank("bank2")->set_entry(0);
}

void pasopia_state::machine_reset()
{
}

WRITE8_MEMBER( pasopia_state::vram_addr_lo_w )
{
	m_vram_addr = (m_vram_addr & 0x3f00) | data;
}

WRITE8_MEMBER( pasopia_state::vram_latch_w )
{
	m_vram_latch = data;
}

READ8_MEMBER( pasopia_state::vram_latch_r )
{
	return m_p_vram[m_vram_addr];
}

READ8_MEMBER( pasopia_state::portb_1_r )
{
	/*
	x--- ---- attribute latch
	-x-- ---- hblank
	--x- ---- vblank
	---x ---- LCD system mode, active low
	*/
	UINT8 grph_latch,lcd_mode;

	m_hblank ^= 0x40; //TODO
	grph_latch = (m_p_vram[m_vram_addr | 0x4000] & 0x80);
	lcd_mode = 0x10;

	return m_hblank | lcd_mode | grph_latch; //bit 4: LCD mode
}


WRITE8_MEMBER( pasopia_state::vram_addr_hi_w )
{
	m_attr_latch = (data & 0x80) | (m_attr_latch & 0x7f);
	if ( BIT(data, 6) && !m_video_wl )
	{
		m_p_vram[m_vram_addr] = m_vram_latch;
		m_p_vram[m_vram_addr | 0x4000] = m_attr_latch;
	}

	m_video_wl = BIT(data, 6);
	m_vram_addr = (m_vram_addr & 0xff) | ((data & 0x3f) << 8);
}

WRITE8_MEMBER( pasopia_state::screen_mode_w )
{
	//m_gfx_mode = (data & 0xe0) >> 5; unused variable
	m_attr_latch = (m_attr_latch & 0x80) | (data & 7);
	printf("Screen Mode=%02x\n",data);
}

READ8_MEMBER( pasopia_state::rombank_r )
{
	return (m_ram_bank) ? 4 : 0;
}

READ8_MEMBER( pasopia_state::mux_r )
{
	return m_mux_data;
}

READ8_MEMBER( pasopia_state::keyb_r )
{
	const char *const keynames[3][4] = { { "KEY0", "KEY1", "KEY2", "KEY3" },
											{ "KEY4", "KEY5", "KEY6", "KEY7" },
											{ "KEY8", "KEY9", "KEYA", "KEYB" } };
	int i,j;
	UINT8 res;

	res = 0;
	for(j=0;j<3;j++)
	{
		if(m_mux_data & 0x10 << j)
		{
			for(i=0;i<4;i++)
			{
				if(m_mux_data & 1 << i)
					res |= ioport(keynames[j][i])->read();
			}
		}
	}

	return res ^ 0xff;
}

WRITE8_MEMBER( pasopia_state::mux_w )
{
	m_mux_data = data;
}

static const gfx_layout p7_chars_8x8 =
{
	8,8,
	RGN_FRAC(1,1),
	1,
	{ 0 },
	{ 0, 1, 2, 3, 4, 5, 6, 7 },
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 },
	8*8
};

static GFXDECODE_START( pasopia )
	GFXDECODE_ENTRY( "chargen", 0x0000, p7_chars_8x8, 0, 4 )
GFXDECODE_END

static const z80_daisy_config pasopia_daisy[] =
{
	{ "z80ctc" },
	{ "z80pio" },
//  { "upd765" }, /* TODO */
	{ NULL }
};



DRIVER_INIT_MEMBER(pasopia_state,pasopia)
{
/*
We preset all banks here, so that bankswitching will incur no speed penalty.
0000 indicates ROMs, 10000 indicates RAM.
*/
	UINT8 *p_ram = memregion("maincpu")->base();
	membank("bank1")->configure_entries(0, 2, &p_ram[0x00000], 0x10000);
	membank("bank2")->configure_entry(0, &p_ram[0x10000]);

	machine().scheduler().timer_pulse(attotime::from_hz(500), timer_expired_delegate(FUNC(pasopia_state::pio_timer),this));
}

static MACHINE_CONFIG_START( pasopia, pasopia_state )
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", Z80, 4000000)
	MCFG_CPU_PROGRAM_MAP(pasopia_map)
	MCFG_CPU_IO_MAP(pasopia_io)
	MCFG_CPU_CONFIG(pasopia_daisy)

	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(60)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
	MCFG_SCREEN_SIZE(640, 480)
	MCFG_SCREEN_VISIBLE_AREA(0, 640-1, 0, 480-1)
	MCFG_SCREEN_UPDATE_DEVICE("crtc", h46505_device, screen_update)
	MCFG_GFXDECODE_ADD("gfxdecode", "palette", pasopia)
	MCFG_PALETTE_ADD("palette", 8)

	/* Devices */
	MCFG_MC6845_ADD("crtc", H46505, "screen", XTAL_4MHz/4)   /* unknown clock, hand tuned to get ~60 fps */
	MCFG_MC6845_SHOW_BORDER_AREA(false)
	MCFG_MC6845_CHAR_WIDTH(8)
	MCFG_MC6845_UPDATE_ROW_CB(pasopia_state, crtc_update_row)

	MCFG_DEVICE_ADD("ppi8255_0", I8255A, 0)
	MCFG_I8255_OUT_PORTA_CB(WRITE8(pasopia_state, vram_addr_lo_w))
	MCFG_I8255_OUT_PORTB_CB(WRITE8(pasopia_state, vram_latch_w))
	MCFG_I8255_IN_PORTC_CB(READ8(pasopia_state, vram_latch_r))

	MCFG_DEVICE_ADD("ppi8255_1", I8255A, 0)
	MCFG_I8255_OUT_PORTA_CB(WRITE8(pasopia_state, screen_mode_w))
	MCFG_I8255_IN_PORTB_CB(READ8(pasopia_state, portb_1_r))
	MCFG_I8255_OUT_PORTC_CB(WRITE8(pasopia_state, vram_addr_hi_w))

	MCFG_DEVICE_ADD("ppi8255_2", I8255A, 0)
	MCFG_I8255_IN_PORTC_CB(READ8(pasopia_state, rombank_r))

	MCFG_DEVICE_ADD("z80ctc", Z80CTC, XTAL_4MHz)
	MCFG_Z80CTC_INTR_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0))
	MCFG_Z80CTC_ZC0_CB(DEVWRITELINE("z80ctc", z80ctc_device, trg1))
	MCFG_Z80CTC_ZC1_CB(DEVWRITELINE("z80ctc", z80ctc_device, trg2))
	MCFG_Z80CTC_ZC2_CB(DEVWRITELINE("z80ctc", z80ctc_device, trg3))

	MCFG_DEVICE_ADD("z80pio", Z80PIO, XTAL_4MHz)
	MCFG_Z80PIO_OUT_INT_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0))
	MCFG_Z80PIO_IN_PA_CB(READ8(pasopia_state, mux_r))
	MCFG_Z80PIO_OUT_PA_CB(WRITE8(pasopia_state, mux_w))
	MCFG_Z80PIO_IN_PB_CB(READ8(pasopia_state, keyb_r))
MACHINE_CONFIG_END

/* ROM definition */
ROM_START( pasopia )
	ROM_REGION( 0x18000, "maincpu", 0 )
	ROM_LOAD( "tbasic.rom", 0x0000, 0x8000, CRC(f53774ff) SHA1(bbec45a3bad8d184505cc6fe1f6e2e60a7fb53f2))

	ROM_REGION( 0x0800, "chargen", 0 )
	ROM_LOAD( "font.rom", 0x0000, 0x0800, BAD_DUMP CRC(a91c45a9) SHA1(a472adf791b9bac3dfa6437662e1a9e94a88b412)) //stolen from pasopia7

	ROM_REGION( 0x8000, "vram", ROMREGION_ERASE00 )
ROM_END

/* Driver */

/*    YEAR  NAME     PARENT  COMPAT   MACHINE    INPUT    INIT      COMPANY      FULLNAME       FLAGS */
COMP( 1986, pasopia, 0,      0,       pasopia,   pasopia, pasopia_state, pasopia, "Toshiba",   "Pasopia", GAME_NOT_WORKING | GAME_NO_SOUND)