1 // license:BSD-3-Clause
2 // copyright-holders:Curt Coder
3 /**********************************************************************
4
5 Cinemaware Warp Speed cartridge emulation
6
7 **********************************************************************/
8
9 /*
10
11 PCB Layout
12 ----------
13
14 |===================|
15 |=| SW1 |
16 |=| |
17 |=| SW2 |
18 |=| |
19 |=| |
20 |=| ROM |
21 |=| LS109|
22 |=| |
23 |===================|
24
25 ROM - "DEI-356NR-WRPIIDA1 (C) NCR A8847 609-2415038 F833071" 16Kx8 ROM
26 SW1 - mode switch (C64/C128)
27 SW2 - reset button
28
29 */
30
31 #include "emu.h"
32 #include "warp_speed.h"
33
34
35
36 //**************************************************************************
37 // MACROS/CONSTANTS
38 //**************************************************************************
39
40 #define UNSCRAMBLE_ADDRESS(_offset) \
41 bitswap<16>(_offset,15,14,12,13,5,2,7,9,11,10,8,6,4,3,1,0)
42
43 #define UNSCRAMBLE_DATA(_data) \
44 bitswap<8>(_data,7,6,5,0,1,4,2,3)
45
46
47
48 //**************************************************************************
49 // DEVICE DEFINITIONS
50 //**************************************************************************
51
52 DEFINE_DEVICE_TYPE(C64_WARP_SPEED, c64_warp_speed_cartridge_device, "c64_warp_speed", "C64 Warp Speed cartridge")
53
54
55 //-------------------------------------------------
56 // INPUT_PORTS( c64_warp_speed )
57 //-------------------------------------------------
58
INPUT_PORTS_START(c64_warp_speed)59 static INPUT_PORTS_START( c64_warp_speed )
60 PORT_START("SW1")
61 PORT_DIPNAME( 0x01, 0x01, "Mode" )
62 PORT_DIPSETTING( 0x01, "C64" )
63 PORT_DIPSETTING( 0x00, "C128" )
64
65 PORT_START("SW2")
66 PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_OTHER ) PORT_NAME("Reset") PORT_CODE(KEYCODE_F11) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF_OWNER, c64_expansion_slot_device, reset_w)
67 INPUT_PORTS_END
68
69
70 //-------------------------------------------------
71 // input_ports - device-specific input ports
72 //-------------------------------------------------
73
74 ioport_constructor c64_warp_speed_cartridge_device::device_input_ports() const
75 {
76 return INPUT_PORTS_NAME( c64_warp_speed );
77 }
78
79
80
81 //**************************************************************************
82 // LIVE DEVICE
83 //**************************************************************************
84
85 //-------------------------------------------------
86 // c64_warp_speed_cartridge_device - constructor
87 //-------------------------------------------------
88
c64_warp_speed_cartridge_device(const machine_config & mconfig,const char * tag,device_t * owner,uint32_t clock)89 c64_warp_speed_cartridge_device::c64_warp_speed_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
90 device_t(mconfig, C64_WARP_SPEED, tag, owner, clock),
91 device_c64_expansion_card_interface(mconfig, *this)
92 {
93 }
94
95
96 //-------------------------------------------------
97 // device_start - device-specific startup
98 //-------------------------------------------------
99
device_start()100 void c64_warp_speed_cartridge_device::device_start()
101 {
102 }
103
104
105 //-------------------------------------------------
106 // device_reset - device-specific reset
107 //-------------------------------------------------
108
device_reset()109 void c64_warp_speed_cartridge_device::device_reset()
110 {
111 m_exrom = 0;
112 m_game = 0;
113 }
114
115
116 //-------------------------------------------------
117 // c64_cd_r - cartridge data read
118 //-------------------------------------------------
119
c64_cd_r(offs_t offset,uint8_t data,int sphi2,int ba,int roml,int romh,int io1,int io2)120 uint8_t c64_warp_speed_cartridge_device::c64_cd_r(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
121 {
122 if (!roml || !romh || !io1 || !io2)
123 {
124 offs_t addr = UNSCRAMBLE_ADDRESS(offset & 0x3fff);
125 data = UNSCRAMBLE_DATA(m_roml[addr]);
126 }
127
128 return data;
129 }
130
131
132 //-------------------------------------------------
133 // c64_cd_w - cartridge data write
134 //-------------------------------------------------
135
c64_cd_w(offs_t offset,uint8_t data,int sphi2,int ba,int roml,int romh,int io1,int io2)136 void c64_warp_speed_cartridge_device::c64_cd_w(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
137 {
138 if (!io1)
139 {
140 m_exrom = 0;
141 m_game = 0;
142 }
143 else if (!io2)
144 {
145 m_exrom = 1;
146 m_game = 1;
147 }
148 }
149