blob: 44c49fb4e88ac712756e0cf37079da33a27bfcff (
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
|
// license:BSD-3-Clause
// copyright-holders:Fabio Priuli
/***************************************************************************
Midway 8080-based black and white hardware
****************************************************************************/
#include "emu.h"
#include "machine/mb14241.h"
//-------------------------------------------------
// mb14241_device - constructor
//-------------------------------------------------
const device_type MB14241 = &device_creator<mb14241_device>;
mb14241_device::mb14241_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, MB14241, "MB14241 Data Shifter", tag, owner, clock, "mb14241", __FILE__), m_shift_data(0), m_shift_count(0)
{
}
//-------------------------------------------------
// device_config_complete - perform any
// operations now that the configuration is
// complete
//-------------------------------------------------
void mb14241_device::device_config_complete()
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void mb14241_device::device_start()
{
save_item(NAME(m_shift_data));
save_item(NAME(m_shift_count));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void mb14241_device::device_reset()
{
m_shift_data = 0;
m_shift_count = 0;
}
/*****************************************************************************
IMPLEMENTATION
*****************************************************************************/
WRITE8_MEMBER( mb14241_device::shift_count_w )
{
m_shift_count = ~data & 0x07;
}
WRITE8_MEMBER( mb14241_device::shift_data_w )
{
m_shift_data = (m_shift_data >> 8) | ((UINT16)data << 7);
}
READ8_MEMBER( mb14241_device::shift_result_r )
{
return m_shift_data >> m_shift_count;
}
|