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
|
// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
ABC 80 16 KB RAM expansion card emulation
*********************************************************************/
#include "emu.h"
#include "ram.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(ABC80_16KB_RAM_CARD, abc80_16kb_ram_card_device, "abc80_16kb", "ABC 80 16KB RAM card")
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// abc80_16kb_ram_card_device - constructor
//-------------------------------------------------
abc80_16kb_ram_card_device::abc80_16kb_ram_card_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) :
device_t(mconfig, ABC80_16KB_RAM_CARD, tag, owner, clock),
device_abcbus_card_interface(mconfig, *this),
m_ram(*this, "ram", 0x4000, ENDIANNESS_LITTLE)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void abc80_16kb_ram_card_device::device_start()
{
}
//**************************************************************************
// ABC BUS INTERFACE
//**************************************************************************
//-------------------------------------------------
// abcbus_xmemfl -
//-------------------------------------------------
uint8_t abc80_16kb_ram_card_device::abcbus_xmemfl(offs_t offset)
{
uint8_t data = 0xff;
if (offset >= 0x8000 && offset < 0xc000)
{
data = m_ram[offset & 0x3fff];
}
return data;
}
//-------------------------------------------------
// abcbus_xmemw -
//-------------------------------------------------
void abc80_16kb_ram_card_device::abcbus_xmemw(offs_t offset, uint8_t data)
{
if (offset >= 0x8000 && offset < 0xc000)
{
m_ram[offset & 0x3fff] = data;
}
}
|