summaryrefslogtreecommitdiffstats
path: root/src/mame/drivers/binbug.cpp
blob: 8420ffea6a0f539bf06a948ff232af2a80ae7c4a (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
// license:BSD-3-Clause
// copyright-holders:Robbbert
/***************************************************************************

        BINBUG

        2013-01-14 Driver created

        All input must be in uppercase.

        Commands:
        A - See and alter memory
        B - Set breakpoint (2 permitted)
        C - Clear breakpoint
        D - cassette save
        G - Go to address, run
        L - cassette load
        S - See and alter registers

        BINBUG is an alternate bios to PIPBUG, however it uses its own
        video output. Method of output is through a DG640 board.

        Keyboard input, like PIPBUG, is via a serial device.
        The baud rate is 300, 8N1.

        The SENSE and FLAG lines are used for 300 baud cassette, in
        conjunction with unknown hardware.

        There are 3 versions of BINBUG:

        - 3.6 300 baud tape routines, 300 baud keyboard, memory-mapped VDU

        - 4.4 300 baud keyboard, ACOS tape system, advanced video routines

        - 5.2 ACOS tape system, 1200 baud terminal


        ToDo:
        - Need dumps of 4.4 and 5.2.

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

#include "emu.h"
#include "bus/rs232/keyboard.h"
#include "cpu/s2650/s2650.h"
#include "imagedev/cassette.h"
#include "imagedev/snapquik.h"
#include "machine/clock.h"
#include "machine/timer.h"
#include "bus/s100/s100.h"
#include "bus/s100/dg640.h"
#include "speaker.h"


class binbug_state : public driver_device
{
public:
	binbug_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_cass(*this, "cassette")
		, m_rs232(*this, "keyboard")
		, m_clock(*this, "cass_clock")
		, m_s100(*this, "s100")
	{ }

	void binbug(machine_config &config);

private:
	DECLARE_READ8_MEMBER(mem_r);
	DECLARE_WRITE8_MEMBER(mem_w);
	DECLARE_WRITE_LINE_MEMBER(kansas_w);
	DECLARE_READ_LINE_MEMBER(binbug_serial_r);
	DECLARE_WRITE_LINE_MEMBER(binbug_serial_w);
	DECLARE_QUICKLOAD_LOAD_MEMBER(quickload_cb);
	TIMER_DEVICE_CALLBACK_MEMBER(kansas_r);

	u8 m_cass_data[4];
	bool m_cassold, m_cassinbit, m_cassoutbit;

	void binbug_mem(address_map &map);

	required_device<cpu_device> m_maincpu;
	required_device<cassette_image_device> m_cass;
	required_device<rs232_port_device> m_rs232;
	required_device<clock_device> m_clock;
	required_device<s100_bus_device> m_s100;
};

WRITE_LINE_MEMBER( binbug_state::kansas_w )
{
	if ((m_cass->get_state() & CASSETTE_MASK_UISTATE) != CASSETTE_RECORD)
		return;

	u8 twobit = m_cass_data[3] & 15;

	if (state)
	{
		if (twobit == 0)
			m_cassold = m_cassoutbit;

		if (m_cassold)
			m_cass->output(BIT(m_cass_data[3], 0) ? -1.0 : +1.0); // 2400Hz
		else
			m_cass->output(BIT(m_cass_data[3], 1) ? -1.0 : +1.0); // 1200Hz

		m_cass_data[3]++;
	}
}

TIMER_DEVICE_CALLBACK_MEMBER( binbug_state::kansas_r )
{
	// no tape - set to idle
	m_cass_data[1]++;
	if (m_cass_data[1] > 32)
	{
		m_cass_data[1] = 32;
		m_cassinbit = 1;
	}

	if ((m_cass->get_state() & CASSETTE_MASK_UISTATE) != CASSETTE_PLAY)
		return;

	/* cassette - turn 1200/2400Hz to a bit */
	uint8_t cass_ws = (m_cass->input() > +0.04) ? 1 : 0;

	if (cass_ws != m_cass_data[0])
	{
		m_cass_data[0] = cass_ws;
		m_cassinbit = (m_cass_data[1] < 12) ? 1 : 0;
		m_cass_data[1] = 0;
	}
}

READ_LINE_MEMBER( binbug_state::binbug_serial_r )
{
	return m_rs232->rxd_r() & m_cassinbit;
}

WRITE_LINE_MEMBER( binbug_state::binbug_serial_w )
{
	m_cassoutbit = state;
}

READ8_MEMBER( binbug_state::mem_r )
{
	return m_s100->smemr_r(offset);
}

WRITE8_MEMBER( binbug_state::mem_w )
{
	m_s100->mwrt_w(offset, data);
}

void binbug_state::binbug_mem(address_map &map)
{
	map.unmap_value_high();
	map(0x0000, 0x03ff).rom();
	map(0x0400, 0x77ff).ram();
	map(0x7800, 0x7fff).rw(FUNC(binbug_state::mem_r),FUNC(binbug_state::mem_w));
}


/* Input ports */
static INPUT_PORTS_START( binbug )
INPUT_PORTS_END


QUICKLOAD_LOAD_MEMBER(binbug_state::quickload_cb)
{
	address_space &space = m_maincpu->space(AS_PROGRAM);
	int i;
	int quick_addr = 0x440;
	int exec_addr;
	int quick_length;
	std::vector<uint8_t> quick_data;
	int read_;
	image_init_result result = image_init_result::FAIL;

	quick_length = image.length();
	if (quick_length < 0x0444)
	{
		image.seterror(IMAGE_ERROR_INVALIDIMAGE, "File too short");
		image.message(" File too short");
	}
	else if (quick_length > 0x8000)
	{
		image.seterror(IMAGE_ERROR_INVALIDIMAGE, "File too long");
		image.message(" File too long");
	}
	else
	{
		quick_data.resize(quick_length);
		read_ = image.fread( &quick_data[0], quick_length);
		if (read_ != quick_length)
		{
			image.seterror(IMAGE_ERROR_INVALIDIMAGE, "Cannot read the file");
			image.message(" Cannot read the file");
		}
		else if (quick_data[0] != 0xc4)
		{
			image.seterror(IMAGE_ERROR_INVALIDIMAGE, "Invalid header");
			image.message(" Invalid header");
		}
		else
		{
			exec_addr = quick_data[1] * 256 + quick_data[2];

			if (exec_addr >= quick_length)
			{
				image.seterror(IMAGE_ERROR_INVALIDIMAGE, "Exec address beyond end of file");
				image.message(" Exec address beyond end of file");
			}
			else
			{
				for (i = quick_addr; i < read_; i++)
					space.write_byte(i, quick_data[i]);

				/* display a message about the loaded quickload */
				image.message(" Quickload: size=%04X : exec=%04X",quick_length,exec_addr);

				// Start the quickload
				m_maincpu->set_state_int(S2650_PC, exec_addr);

				result = image_init_result::PASS;
			}
		}
	}

	return result;
}

static DEVICE_INPUT_DEFAULTS_START( keyboard )
	DEVICE_INPUT_DEFAULTS( "RS232_TXBAUD", 0xff, RS232_BAUD_300 )
	DEVICE_INPUT_DEFAULTS( "RS232_STARTBITS", 0xff, RS232_STARTBITS_1 )
	DEVICE_INPUT_DEFAULTS( "RS232_DATABITS", 0xff, RS232_DATABITS_8 )
	DEVICE_INPUT_DEFAULTS( "RS232_PARITY", 0xff, RS232_PARITY_NONE )
	DEVICE_INPUT_DEFAULTS( "RS232_STOPBITS", 0xff, RS232_STOPBITS_1 )
DEVICE_INPUT_DEFAULTS_END

static void binbug_s100_devices(device_slot_interface &device)
{
	device.option_add("dg640", S100_DG640);
}

void binbug_state::binbug(machine_config &config)
{
	SPEAKER(config, "mono").front_center();

	/* Cassette */
	CASSETTE(config, m_cass);
	m_cass->set_default_state(CASSETTE_STOPPED | CASSETTE_MOTOR_ENABLED | CASSETTE_SPEAKER_ENABLED);
	m_cass->add_route(ALL_OUTPUTS, "mono", 0.05);
	TIMER(config, "kansas_r").configure_periodic(FUNC(binbug_state::kansas_r), attotime::from_hz(40000));

	CLOCK(config, m_clock, 4'800); // 300 baud x 16(divider) = 4800
	m_clock->signal_handler().set(FUNC(binbug_state::kansas_w));

	/* basic machine hardware */
	s2650_device &maincpu(S2650(config, m_maincpu, XTAL(1'000'000)));
	maincpu.set_addrmap(AS_PROGRAM, &binbug_state::binbug_mem);
	maincpu.sense_handler().set(FUNC(binbug_state::binbug_serial_r));
	maincpu.flag_handler().set(FUNC(binbug_state::binbug_serial_w));

	/* Keyboard */
	RS232_PORT(config, m_rs232, default_rs232_devices, "keyboard").set_option_device_input_defaults("keyboard", DEVICE_INPUT_DEFAULTS_NAME(keyboard));

	/* quickload */
	QUICKLOAD(config, "quickload", "pgm", attotime::from_seconds(1)).set_load_callback(FUNC(binbug_state::quickload_cb), this);

	S100_BUS(config, m_s100, 0);
	S100_SLOT(config, "s100:1", binbug_s100_devices, "dg640");
}


/* ROM definition */
ROM_START( binbug )
	ROM_REGION( 0x8000, "maincpu", ROMREGION_ERASEFF )
	ROM_LOAD( "binbug.rom", 0x0000, 0x0400, CRC(2cb1ac6e) SHA1(a969883fc767484d6b0fa103cfa4b4129b90441b) )
ROM_END

/* Driver */

//    YEAR  NAME    PARENT  COMPAT   MACHINE    INPUT   CLASS         INIT        COMPANY      FULLNAME      FLAGS
COMP( 1980, binbug, pipbug,   0,     binbug,    binbug, binbug_state, empty_init, "MicroByte", "BINBUG 3.6", 0 )