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
|
// license:BSD-3-Clause
// copyright-holders:R. Belmont
/*********************************************************************
a2arcadeboard.c
Implementation of the Third Millenium Engineering Arcade Board
TODO:
- VDPTEST program seems to want more than 16K of RAM, but docs/ads/press releases say 16k, period
- MLDEMO program needs vsync IRQ from the TMS but doesn't program the registers the way our emulation
wants to enable IRQs
*********************************************************************/
#include "emu.h"
#include "a2arcadebd.h"
#include "video/tms9928a.h"
#include "sound/ay8910.h"
#include "speaker.h"
namespace {
/***************************************************************************
PARAMETERS
***************************************************************************/
#define TMS_TAG "arcbd_tms"
#define AY_TAG "arcbd_ay"
#define SCREEN_TAG "screen"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
class a2bus_arcboard_device:
public device_t,
public device_a2bus_card_interface
{
public:
// construction/destruction
a2bus_arcboard_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
protected:
a2bus_arcboard_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_add_mconfig(machine_config &config) override;
// overrides of standard a2bus slot functions
virtual uint8_t read_c0nx(uint8_t offset) override;
virtual void write_c0nx(uint8_t offset, uint8_t data) override;
private:
DECLARE_WRITE_LINE_MEMBER( tms_irq_w );
required_device<tms9918a_device> m_tms;
required_device<ay8910_device> m_ay;
};
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void a2bus_arcboard_device::device_add_mconfig(machine_config &config)
{
TMS9918A(config, m_tms, XTAL(10'738'635)).set_screen(SCREEN_TAG);
m_tms->set_vram_size(0x4000); // 16k of VRAM
m_tms->int_callback().set(FUNC(a2bus_arcboard_device::tms_irq_w));
SCREEN(config, SCREEN_TAG, SCREEN_TYPE_RASTER);
SPEAKER(config, "mono").front_center();
AY8910(config, m_ay, 1022727).add_route(ALL_OUTPUTS, "mono", 1.0);
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
a2bus_arcboard_device::a2bus_arcboard_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
a2bus_arcboard_device(mconfig, A2BUS_ARCADEBOARD, tag, owner, clock)
{
}
a2bus_arcboard_device::a2bus_arcboard_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, type, tag, owner, clock),
device_a2bus_card_interface(mconfig, *this),
m_tms(*this, TMS_TAG),
m_ay(*this, AY_TAG)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void a2bus_arcboard_device::device_start()
{
}
void a2bus_arcboard_device::device_reset()
{
}
/*
C0nx map:
0 - TMS read vram
1 - TMS read status
2 - TMS write vram
3 - TMS write register
5 - AY register select
6 - AY data
*/
uint8_t a2bus_arcboard_device::read_c0nx(uint8_t offset)
{
switch (offset)
{
case 0:
return m_tms->vram_read();
case 1:
return m_tms->register_read();
case 6:
return m_ay->data_r();
}
return 0xff;
}
void a2bus_arcboard_device::write_c0nx(uint8_t offset, uint8_t data)
{
switch (offset)
{
case 0:
case 2:
m_tms->vram_write(data);
break;
case 1:
case 3:
m_tms->register_write(data);
break;
case 5:
m_ay->address_w(data);
break;
case 6:
m_ay->data_w(data);
break;
}
}
WRITE_LINE_MEMBER( a2bus_arcboard_device::tms_irq_w )
{
if (state)
{
raise_slot_irq();
}
else
{
lower_slot_irq();
}
}
} // anonymous namespace
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
DEFINE_DEVICE_TYPE_PRIVATE(A2BUS_ARCADEBOARD, device_a2bus_card_interface, a2bus_arcboard_device, "a2arcbd", "Third Millenium Engineering Arcade Board")
|