summaryrefslogtreecommitdiffstatshomepage
path: root/src/mess/video/tmc600.c
blob: f36568af6982d587ede61697d4d44d46ce5d1795 (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
// license:BSD-3-Clause
// copyright-holders:Curt Coder
#include "emu.h"
#include "sound/cdp1869.h"
#include "includes/tmc600.h"

WRITE8_MEMBER( tmc600_state::vismac_register_w )
{
	m_vismac_reg_latch = data;
}

WRITE8_MEMBER( tmc600_state::vismac_data_w )
{
	UINT16 ma = m_maincpu->get_memory_address();

	switch (m_vismac_reg_latch)
	{
	case 0x20:
		// character color latch
		m_vismac_color_latch = data;
		break;

	case 0x30:
		// background color latch
		m_vismac_bkg_latch = data & 0x07;

		m_vis->out3_w(space, ma, data);
		break;

	case 0x40:
		m_vis->out4_w(space, ma, data);
		break;

	case 0x50:
		m_vis->out5_w(space, ma, data);
		break;

	case 0x60:
		m_vis->out6_w(space, ma, data);
		break;

	case 0x70:
		m_vis->out7_w(space, ma, data);
		break;
	}
}

TIMER_DEVICE_CALLBACK_MEMBER(tmc600_state::blink_tick)
{
	m_blink = !m_blink;
}

UINT8 tmc600_state::get_color(UINT16 pma)
{
	UINT16 pageaddr = pma & TMC600_PAGE_RAM_MASK;
	UINT8 color = m_color_ram[pageaddr];

	if (BIT(color, 3) && m_blink)
	{
		color = m_vismac_bkg_latch;
	}

	return color;
}

WRITE8_MEMBER( tmc600_state::page_ram_w )
{
	m_page_ram[offset] = data;
	m_color_ram[offset] = m_vismac_color_latch;
}

static ADDRESS_MAP_START( cdp1869_page_ram, AS_0, 8, tmc600_state )
	AM_RANGE(0x000, 0x3ff) AM_MIRROR(0x400) AM_RAM AM_SHARE("page_ram") AM_WRITE(page_ram_w)
ADDRESS_MAP_END

CDP1869_CHAR_RAM_READ_MEMBER( tmc600_state::tmc600_char_ram_r )
{
	UINT16 pageaddr = pma & TMC600_PAGE_RAM_MASK;
	UINT8 color = get_color(pageaddr);
	UINT16 charaddr = ((cma & 0x08) << 8) | (pmd << 3) | (cma & 0x07);
	UINT8 cdb = m_char_rom[charaddr] & 0x3f;

	int ccb0 = BIT(color, 2);
	int ccb1 = BIT(color, 1);

	return (ccb1 << 7) | (ccb0 << 6) | cdb;
}

CDP1869_PCB_READ_MEMBER( tmc600_state::tmc600_pcb_r )
{
	UINT16 pageaddr = pma & TMC600_PAGE_RAM_MASK;
	UINT8 color = get_color(pageaddr);

	return BIT(color, 0);
}

void tmc600_state::video_start()
{
	// allocate memory
	m_color_ram.allocate(TMC600_PAGE_RAM_SIZE);

	// register for state saving
	save_item(NAME(m_vismac_reg_latch));
	save_item(NAME(m_vismac_color_latch));
	save_item(NAME(m_vismac_bkg_latch));
	save_item(NAME(m_blink));
}

static const gfx_layout tmc600_charlayout =
{
	6, 9,                   // 6 x 9 characters
	256,                    // 256 characters
	1,                      // 1 bits per pixel
	{ 0 },                  // no bitplanes
	// x offsets
	{ 2, 3, 4, 5, 6, 7 },
	// y offsets
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 2048*8 },
	8*8                     // every char takes 8 x 8 bytes
};

static GFXDECODE_START( tmc600 )
	GFXDECODE_ENTRY( "chargen", 0x0000, tmc600_charlayout, 0, 36 )
GFXDECODE_END

MACHINE_CONFIG_FRAGMENT( tmc600_video )
	// video hardware
	MCFG_CDP1869_SCREEN_PAL_ADD(CDP1869_TAG, SCREEN_TAG, CDP1869_DOT_CLK_PAL)
	MCFG_TIMER_DRIVER_ADD_PERIODIC("blink", tmc600_state, blink_tick, attotime::from_hz(2))

	MCFG_GFXDECODE_ADD("gfxdecode", CDP1869_TAG":palette", tmc600)

	// sound hardware
	MCFG_SPEAKER_STANDARD_MONO("mono")
	MCFG_CDP1869_ADD(CDP1869_TAG, CDP1869_DOT_CLK_PAL, cdp1869_page_ram)
	MCFG_CDP1869_COLOR_CLOCK(CDP1869_COLOR_CLK_PAL)
	MCFG_CDP1869_CHAR_PCB_READ_OWNER(tmc600_state, tmc600_pcb_r)
	MCFG_CDP1869_CHAR_RAM_READ_OWNER(tmc600_state, tmc600_char_ram_r)
	MCFG_CDP1869_PAL_NTSC_CALLBACK(VCC)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)
MACHINE_CONFIG_END