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
|
// license:BSD-3-Clause
// copyright-holders:Angelo Salese
/***************************************************************************
PC-9801 MEMSW interface
A CMOS-like interface that maps in the TVRAM area
Reference URL:
http://ohta.music.coocan.jp/packen/board/memsw.htm
Running the MON command under BASIC allows the user to change these
settings.
ssw -> for displaying current settings on screen;
ssw# -> to change the given #
List of settings, parenthesis for default if not zero
SW1 $A3FE2
xx-- ---- stop bit length (01)
--x- ---- parity specification
---x ---- parity check
---- xx-- data bit length (10)
---- --x- communication method
---- ---x X parameter
SW2 $A3FE6
x--- ---- S parameter
-x-- ---- line feed code when sending
--x- ---- line feed code when receiving
---x ---- Japanese shift code
---- xxxx transfer speed (0101)
SW3 $A3FEA
x--- ---- Operation when DEL code is received (input / output mode)
x--- ---- Operation when DEL code is received (terminal mode)
-x-- ---- Text screen color
--x- ---- Maximum operating frequency for V30 coprocessor
---x ---- With or without V30 coprocessor
---- x--- Coprocessor for 80286,386
---- -xxx Conventional memory size (100)
SW4 $A3FEE
x--- ---- Expansion ROM CE000-CFFFF
-x-- ---- Expansion ROM CA000-CBFFF
--x- ---- Expansion ROM D4000-D5FFF
---x ---- Expansion ROM D0000-D3FFF
---- x--- Expansion ROM CC000-CFFFF
---- -x-- Expansion ROM C8000-C9FFF
---- --xx (Unused)
SW5 $A3FF2
xxxx ---- Select boot device (0000)
1100 ---- SCSI HDD #1
1011 ---- HDD #2
1010 ---- HDD #1
1000 ---- ROM BASIC
0110 ---- MO disk
0100 ---- 1MB FDD
0010 ---- 640K FDD
0000 ---- standard
???? ---- ROM BASIC
---- x--- Screen Hard copy color
---- -x-- Use HDD user ID
---- --x- Prioritize HDD with device name
---- ---x PC-PR201 series used (1)
SW5 $A3FF6
--x- ---- Use modem-NCU control function
---x ---- Extended screen hard copy function
---- x--- Use monitor mode (Use extended monitor mode)
xx-- -xxx (Unused)
TODO:
- Is the mapping truly aligned to 2 bytes? Looks more like 4, needs real
HW verification.
***************************************************************************/
#include "emu.h"
#include "pc9801_memsw.h"
#include "coreutil.h"
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
// device type definition
DEFINE_DEVICE_TYPE(PC9801_MEMSW, pc9801_memsw_device, "pc9801_memsw", "NEC PC-9801 Memory Switch device")
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// pc9801_memsw_device - constructor
//-------------------------------------------------
pc9801_memsw_device::pc9801_memsw_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, PC9801_MEMSW, tag, owner, clock),
device_nvram_interface(mconfig, *this)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void pc9801_memsw_device::device_start()
{
save_pointer(NAME(m_bram), m_bram_size);
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void pc9801_memsw_device::device_reset()
{
}
void pc9801_memsw_device::nvram_default()
{
system_time systime;
const uint8_t default_memsw_data[0x10] =
{
0xe1, 0x48, 0xe1, 0x05,
0xe1, 0x04, 0xe1, 0x00,
0xe1, 0x01, 0xe1, 0x00,
0xe1, 0x00, 0xe1, 0x00
};
memcpy(m_bram, default_memsw_data, m_bram_size);
machine().current_datetime(systime);
m_bram[0xf] = dec_2_bcd(systime.local_time.year - 2000) & 0xff;
}
bool pc9801_memsw_device::nvram_read(util::read_stream &file)
{
size_t actual_size;
return !file.read(m_bram, m_bram_size, actual_size) && actual_size == m_bram_size;
}
bool pc9801_memsw_device::nvram_write(util::write_stream &file)
{
size_t actual_size;
return !file.write(m_bram, m_bram_size, actual_size) && actual_size == m_bram_size;
}
//**************************************************************************
// READ/WRITE HANDLERS
//**************************************************************************
uint8_t pc9801_memsw_device::read(uint8_t offset)
{
return m_bram[offset];
}
void pc9801_memsw_device::write( uint8_t offset, uint8_t data )
{
m_bram[offset] = data;
}
|