summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/k8915.cpp
blob: 74c622803bba0d559a93c5bb0845b7272c520cbc (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
// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic, Robbbert
/***************************************************************************

Robotron K8915

2010-08-30

When it says DIAGNOSTIC RAZ P, press enter.

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

#include "emu.h"
#include "cpu/z80/z80.h"
#include "machine/z80ctc.h"
#include "machine/z80sio.h"
#include "machine/clock.h"
#include "bus/rs232/rs232.h"
#include "screen.h"

class k8915_state : public driver_device
{
public:
	k8915_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_p_videoram(*this, "videoram")
		, m_p_chargen(*this, "chargen")
	{ }

	DECLARE_WRITE8_MEMBER(k8915_a8_w);
	DECLARE_DRIVER_INIT(k8915);
	uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);

	void k8915(machine_config &config);
	void io_map(address_map &map);
	void mem_map(address_map &map);
private:
	uint8_t m_framecnt;
	virtual void machine_reset() override;
	required_device<cpu_device> m_maincpu;
	required_shared_ptr<uint8_t> m_p_videoram;
	required_region_ptr<u8> m_p_chargen;
};


WRITE8_MEMBER( k8915_state::k8915_a8_w )
{
// seems to switch ram and rom around.
	if (data == 0x87)
		membank("boot")->set_entry(0); // ram at 0000
	else
		membank("boot")->set_entry(1); // rom at 0000
}

void k8915_state::mem_map(address_map &map)
{
	map.unmap_value_high();
	map(0x0000, 0x0fff).bankrw("boot");
	map(0x1000, 0x17ff).ram().share("videoram");
	map(0x1800, 0xffff).ram();
}

void k8915_state::io_map(address_map &map)
{
	map.global_mask(0xff);
	map(0x50, 0x53).rw("sio", FUNC(z80sio_device::ba_cd_r), FUNC(z80sio_device::ba_cd_w));
	map(0x58, 0x5b).rw("ctc", FUNC(z80ctc_device::read), FUNC(z80ctc_device::write));
	map(0xa8, 0xa8).w(this, FUNC(k8915_state::k8915_a8_w));
}

/* Input ports */
static INPUT_PORTS_START( k8915 )
INPUT_PORTS_END

void k8915_state::machine_reset()
{
	membank("boot")->set_entry(1);
}

DRIVER_INIT_MEMBER(k8915_state,k8915)
{
	uint8_t *RAM = memregion("maincpu")->base();
	membank("boot")->configure_entries(0, 2, &RAM[0x0000], 0x10000);
}

uint32_t k8915_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	uint8_t y,ra,chr,gfx;
	uint16_t sy=0,ma=0,x;

	m_framecnt++;

	for (y = 0; y < 25; y++)
	{
		for (ra = 0; ra < 10; ra++)
		{
			uint16_t *p = &bitmap.pix16(sy++);

			for (x = ma; x < ma + 80; x++)
			{
				gfx = 0;

				if (ra < 9)
				{
					chr = m_p_videoram[x];

					/* Take care of flashing characters */
					if ((chr & 0x80) && (m_framecnt & 0x08))
						chr = 0x20;

					chr &= 0x7f;

					gfx = m_p_chargen[(chr<<4) | ra ];
				}

				/* Display a scanline of a character */
				*p++ = BIT(gfx, 7);
				*p++ = BIT(gfx, 6);
				*p++ = BIT(gfx, 5);
				*p++ = BIT(gfx, 4);
				*p++ = BIT(gfx, 3);
				*p++ = BIT(gfx, 2);
				*p++ = BIT(gfx, 1);
				*p++ = BIT(gfx, 0);
			}
		}
		ma+=80;
	}
	return 0;
}


MACHINE_CONFIG_START(k8915_state::k8915)
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", Z80, XTAL(4'915'200) / 2)
	MCFG_CPU_PROGRAM_MAP(mem_map)
	MCFG_CPU_IO_MAP(io_map)

	/* video hardware */
	MCFG_SCREEN_ADD_MONOCHROME("screen", RASTER, rgb_t::green())
	MCFG_SCREEN_REFRESH_RATE(60)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
	MCFG_SCREEN_UPDATE_DRIVER(k8915_state, screen_update)
	MCFG_SCREEN_SIZE(640, 250)
	MCFG_SCREEN_VISIBLE_AREA(0, 639, 0, 249)
	MCFG_SCREEN_PALETTE("palette")

	MCFG_PALETTE_ADD_MONOCHROME("palette")

	MCFG_DEVICE_ADD("ctc_clock", CLOCK, XTAL(4'915'200) / 2)
	MCFG_CLOCK_SIGNAL_HANDLER(DEVWRITELINE("ctc", z80ctc_device, trg2))

	MCFG_DEVICE_ADD("ctc", Z80CTC, XTAL(4'915'200) / 2)
	MCFG_Z80CTC_ZC2_CB(DEVWRITELINE("sio", z80sio_device, rxtxcb_w))

	MCFG_DEVICE_ADD("sio", Z80SIO, XTAL(4'915'200) / 2)
	MCFG_Z80SIO_OUT_TXDB_CB(DEVWRITELINE("rs232", rs232_port_device, write_txd))
	MCFG_Z80SIO_OUT_DTRB_CB(DEVWRITELINE("rs232", rs232_port_device, write_dtr))
	MCFG_Z80SIO_OUT_RTSB_CB(DEVWRITELINE("rs232", rs232_port_device, write_rts))

	MCFG_RS232_PORT_ADD("rs232", default_rs232_devices, "keyboard")
	MCFG_RS232_RXD_HANDLER(DEVWRITELINE("sio", z80sio_device, rxb_w))
	MCFG_RS232_DCD_HANDLER(DEVWRITELINE("sio", z80sio_device, dcdb_w))
	MCFG_RS232_CTS_HANDLER(DEVWRITELINE("sio", z80sio_device, ctsb_w))
MACHINE_CONFIG_END


/* ROM definition */
ROM_START( k8915 )
	ROM_REGION( 0x11000, "maincpu", ROMREGION_ERASEFF )
	ROM_LOAD( "k8915.bin", 0x10000, 0x1000, CRC(ca70385f) SHA1(a34c14adae9be821678aed7f9e33932ee1f3e61c))

	/* character generator not dumped, using the one from 'c10' for now */
	ROM_REGION( 0x2000, "chargen", 0 )
	ROM_LOAD( "c10_char.bin", 0x0000, 0x2000, BAD_DUMP CRC(cb530b6f) SHA1(95590bbb433db9c4317f535723b29516b9b9fcbf))
ROM_END

/* Driver */

//    YEAR  NAME    PARENT  COMPAT  MACHINE  INPUT  STATE        INIT   COMPANY     FULLNAME  FLAGS
COMP( 1982, k8915,  0,      0,      k8915,   k8915, k8915_state, k8915, "Robotron", "K8915",  MACHINE_NOT_WORKING | MACHINE_NO_SOUND)