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
|
// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************
Power Software Joystick Interface
**********************************************************************/
#include "emu.h"
#include "pwrjoy.h"
#include "bus/vcs_ctrl/ctrl.h"
namespace {
class electron_pwrjoy_device
: public device_t
, public device_electron_expansion_interface
{
public:
electron_pwrjoy_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, ELECTRON_PWRJOY, tag, owner, clock)
, device_electron_expansion_interface(mconfig, *this)
, m_exp_rom(*this, "exp_rom")
, m_joy(*this, "joy")
, m_romsel(0)
{
}
protected:
// device_t overrides
virtual void device_start() override ATTR_COLD { }
// optional information overrides
virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
virtual const tiny_rom_entry *device_rom_region() const override ATTR_COLD;
virtual uint8_t expbus_r(offs_t offset) override;
virtual void expbus_w(offs_t offset, uint8_t data) override;
private:
required_memory_region m_exp_rom;
required_device<vcs_control_port_device> m_joy;
uint8_t m_romsel;
};
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void electron_pwrjoy_device::device_add_mconfig(machine_config &config)
{
VCS_CONTROL_PORT(config, m_joy, vcs_control_port_devices, "joy");
}
//-------------------------------------------------
// rom_region - device-specific ROM region
//-------------------------------------------------
ROM_START( pwrjoy )
// Bank 12 Expansion module operating system
ROM_REGION(0x2000, "exp_rom", 0)
ROM_LOAD("power_joystick.rom", 0x0000, 0x2000, CRC(44fb9360) SHA1(6d3aa85a436db952906e84839496e681ea115168))
ROM_END
const tiny_rom_entry *electron_pwrjoy_device::device_rom_region() const
{
return ROM_NAME( pwrjoy );
}
//-------------------------------------------------
// expbus_r - expansion data read
//-------------------------------------------------
uint8_t electron_pwrjoy_device::expbus_r(offs_t offset)
{
uint8_t data = 0xff;
if (offset >= 0x8000 && offset < 0xc000)
{
if (m_romsel == 15)
{
data = m_exp_rom->base()[offset & 0x1fff];
}
}
else if (offset == 0xfcc0)
{
data = bitswap<8>(m_joy->read_joy(), 7, 6, 4, 5, 3, 2, 1, 0);
}
return data;
}
//-------------------------------------------------
// expbus_w - expansion data write
//-------------------------------------------------
void electron_pwrjoy_device::expbus_w(offs_t offset, uint8_t data)
{
if ((offset == 0xfe05) && !(data & 0xf0))
{
m_romsel = data & 0x0f;
}
}
} // anonymous namespace
DEFINE_DEVICE_TYPE_PRIVATE(ELECTRON_PWRJOY, device_electron_expansion_interface, electron_pwrjoy_device, "electron_pwrjoy", "Power Software Joystick Interface")
|