summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/chaos.c
blob: 7c0c72ae3ac8d3632d04e293796580d7858f4e87 (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
// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic, Robbbert
/***************************************************************************

    Chaos2

    08/04/2010 Skeleton driver.
    19/05/2012 Connected to a terminal, system is usable [Robbbert]

    This is a homebrew system: http://koo.corpus.cam.ac.uk/chaos/

    There are no schematics or manuals, so the results might not be
    totally accurate.

    With the DOS config switch turned off, the only accepted input
    is a line starting with '&'. The actual commands are unknown.

    With DOS enabled, a large number of commands become available.
    These are:
    access, ask, ascdis, bpclr, bpset, close, control, copy, devfive, dir,
    end, exec, execute, fill, find, goto, if, input, let, list, load, lowercase,
    memdis, memset, open, port, read, reboot, runhex, run, save, type, typesl,
    verify.
    An example is: memdis 0 f
    Don't try 'fill' - it fills all memory with zeroes, crashing the system.

    ToDo:
    - Connect up floppy disk (no info available on this)

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

#include "emu.h"
#include "cpu/s2650/s2650.h"
#include "machine/terminal.h"

#define TERMINAL_TAG "terminal"

class chaos_state : public driver_device
{
public:
	chaos_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_terminal(*this, TERMINAL_TAG),
		m_p_ram(*this, "p_ram") ,
		m_maincpu(*this, "maincpu")
	{
	}

	DECLARE_READ8_MEMBER(port1e_r);
	DECLARE_WRITE8_MEMBER(port1f_w);
	DECLARE_READ8_MEMBER(port90_r);
	DECLARE_READ8_MEMBER(port91_r);
	DECLARE_WRITE8_MEMBER(port92_w);
	DECLARE_WRITE8_MEMBER(kbd_put);
	UINT8 m_term_data;
	virtual void machine_reset();
	required_device<generic_terminal_device> m_terminal;
	required_shared_ptr<UINT8> m_p_ram;
	required_device<cpu_device> m_maincpu;
};


static ADDRESS_MAP_START( chaos_mem, AS_PROGRAM, 8, chaos_state )
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE(0x0000, 0x7fff) AM_RAM AM_SHARE("p_ram")
ADDRESS_MAP_END

static ADDRESS_MAP_START( chaos_io, AS_IO, 8, chaos_state )
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE(0x1e, 0x1e) AM_READ(port1e_r)
	AM_RANGE(0x1f, 0x1f) AM_READWRITE(port90_r, port1f_w)
	AM_RANGE(0x90, 0x90) AM_READ(port90_r)
	AM_RANGE(0x91, 0x91) AM_READ(port91_r)
	AM_RANGE(0x92, 0x92) AM_DEVWRITE(TERMINAL_TAG, generic_terminal_device, write)
	AM_RANGE(0x101, 0x103) AM_NOP // stops error log filling up while using debug
ADDRESS_MAP_END

/* Input ports */
static INPUT_PORTS_START( chaos )
	PORT_START("CONFIG")
	PORT_CONFNAME( 0x01, 0x00, "Enable DOS")
	PORT_CONFSETTING(    0x01, DEF_STR(No))
	PORT_CONFSETTING(    0x00, DEF_STR(Yes))
INPUT_PORTS_END


// Port 1E - Bit 0 indicates key pressed, Bit 1 indicates ok to output

READ8_MEMBER( chaos_state::port1e_r )
{
	return (m_term_data) ? 1 : 0;
}

WRITE8_MEMBER( chaos_state::port1f_w )
{
	// make the output readable on our terminal
	if (data == 0x09)
		return;
	else
	if (!data)
		data = 0x24;

	m_terminal->write(space, 0, data);

	if (data == 0x0d)
		m_terminal->write(space, 0, 0x0a);
}

READ8_MEMBER( chaos_state::port90_r )
{
	UINT8 ret = m_term_data;
	m_term_data = 0;
	return ret;
}

// Status port
// Bit 0 = L use ports 1E & 1F; H use ports 90 & 92
// Bit 3 = key pressed
// Bit 7 = ok to output

READ8_MEMBER( chaos_state::port91_r )
{
	UINT8 ret = 0x80 | ioport("CONFIG")->read();
	ret |= (m_term_data) ? 8 : 0;
	return ret;
}

WRITE8_MEMBER( chaos_state::kbd_put )
{
	m_term_data = data;
}

void chaos_state::machine_reset()
{
	// copy the roms into ram
	UINT8* ROM = memregion("maincpu")->base();
	memcpy(m_p_ram, ROM, 0x3000);
	memcpy(m_p_ram+0x7000, ROM+0x7000, 0x1000);
}

static MACHINE_CONFIG_START( chaos, chaos_state )
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu",S2650, XTAL_1MHz)
	MCFG_CPU_PROGRAM_MAP(chaos_mem)
	MCFG_CPU_IO_MAP(chaos_io)

	/* video hardware */
	MCFG_DEVICE_ADD(TERMINAL_TAG, GENERIC_TERMINAL, 0)
	MCFG_GENERIC_TERMINAL_KEYBOARD_CB(WRITE8(chaos_state, kbd_put))
MACHINE_CONFIG_END

/* ROM definition */
ROM_START( chaos )
	ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
	ROM_LOAD( "chaos.001", 0x0000, 0x1000, CRC(3b433e72) SHA1(5b487337d71253d0e64e123f405da9eaf20e87ac))
	ROM_LOAD( "chaos.002", 0x1000, 0x1000, CRC(8b0b487f) SHA1(0d167cf3004a81c87446f2f1464e3debfa7284fe))
	ROM_LOAD( "chaos.003", 0x2000, 0x1000, CRC(5880db81) SHA1(29b8f1b03c83953f66464ad1fbbfe2e019637ce1))
	ROM_LOAD( "chaos.004", 0x7000, 0x1000, CRC(5d6839d6) SHA1(237f52f0780ac2e29d57bf06d0f7a982eb523084))
ROM_END

/* Driver */

/*    YEAR  NAME    PARENT  COMPAT   MACHINE    INPUT    INIT     COMPANY     FULLNAME       FLAGS */
COMP( 1983, chaos,  0,      0,       chaos,     chaos, driver_device,   0,     "<unknown>",  "Chaos 2", MACHINE_NO_SOUND_HW )