1 // license:BSD-3-Clause
2 // copyright-holders:Curt Coder
3 /**********************************************************************
4
5 Dela 256KB EPROM cartridge emulation
6
7 **********************************************************************/
8
9 #include "emu.h"
10 #include "dela_ep256.h"
11
12
13
14 //**************************************************************************
15 // DEVICE DEFINITIONS
16 //**************************************************************************
17
18 DEFINE_DEVICE_TYPE(C64_DELA_EP256, c64_dela_ep256_cartridge_device, "c64_dela_ep256", "C64 Dela 256KB EPROM cartridge")
19
20
21 //-------------------------------------------------
22 // device_add_mconfig - add device configuration
23 //-------------------------------------------------
24
device_add_mconfig(machine_config & config)25 void c64_dela_ep256_cartridge_device::device_add_mconfig(machine_config &config)
26 {
27 GENERIC_SOCKET(config, "rom1", generic_linear_slot, nullptr, "bin,rom");
28 GENERIC_SOCKET(config, "rom2", generic_linear_slot, nullptr, "bin,rom");
29 GENERIC_SOCKET(config, "rom3", generic_linear_slot, nullptr, "bin,rom");
30 GENERIC_SOCKET(config, "rom4", generic_linear_slot, nullptr, "bin,rom");
31 GENERIC_SOCKET(config, "rom5", generic_linear_slot, nullptr, "bin,rom");
32 GENERIC_SOCKET(config, "rom6", generic_linear_slot, nullptr, "bin,rom");
33 GENERIC_SOCKET(config, "rom7", generic_linear_slot, nullptr, "bin,rom");
34 GENERIC_SOCKET(config, "rom8", generic_linear_slot, nullptr, "bin,rom");
35 }
36
37
38
39 //**************************************************************************
40 // LIVE DEVICE
41 //**************************************************************************
42
43 //-------------------------------------------------
44 // c64_dela_ep256_cartridge_device - constructor
45 //-------------------------------------------------
46
c64_dela_ep256_cartridge_device(const machine_config & mconfig,const char * tag,device_t * owner,uint32_t clock)47 c64_dela_ep256_cartridge_device::c64_dela_ep256_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
48 device_t(mconfig, C64_DELA_EP256, tag, owner, clock),
49 device_c64_expansion_card_interface(mconfig, *this)
50 {
51 for (int i = 0; i < 8; i++)
52 {
53 char str[6];
54 sprintf(str, "rom%i", i + 1);
55 m_eproms[i] = subdevice<generic_slot_device>(str);
56 }
57 }
58
59
60 //-------------------------------------------------
61 // device_start - device-specific startup
62 //-------------------------------------------------
63
device_start()64 void c64_dela_ep256_cartridge_device::device_start()
65 {
66 // state saving
67 save_item(NAME(m_bank));
68 save_item(NAME(m_reset));
69 save_item(NAME(m_socket));
70 }
71
72
73 //-------------------------------------------------
74 // device_reset - device-specific reset
75 //-------------------------------------------------
76
device_reset()77 void c64_dela_ep256_cartridge_device::device_reset()
78 {
79 m_reset = 1;
80 m_bank = 0;
81 m_exrom = 0;
82 m_socket = 0;
83 }
84
85
86 //-------------------------------------------------
87 // c64_cd_r - cartridge data read
88 //-------------------------------------------------
89
c64_cd_r(offs_t offset,uint8_t data,int sphi2,int ba,int roml,int romh,int io1,int io2)90 uint8_t c64_dela_ep256_cartridge_device::c64_cd_r(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
91 {
92 if (!roml)
93 {
94 if (m_reset)
95 {
96 data = m_roml[offset & 0x1fff];
97 }
98 else
99 {
100 offs_t addr = (m_bank << 13) | (offset & 0x1fff);
101 data = m_eproms[m_socket]->read_rom(addr);
102 }
103 }
104
105 return data;
106 }
107
108
109 //-------------------------------------------------
110 // c64_cd_w - cartridge data write
111 //-------------------------------------------------
112
c64_cd_w(offs_t offset,uint8_t data,int sphi2,int ba,int roml,int romh,int io1,int io2)113 void c64_dela_ep256_cartridge_device::c64_cd_w(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
114 {
115 if (!io2 && ((offset & 0xf0) == 0xa0))
116 {
117 /*
118
119 bit description
120
121 0 socket selection bit 0
122 1 socket selection bit 1
123 2 socket selection bit 2
124 3
125 4 bank selection bit 0
126 5 bank selection bit 1
127 6
128 7 EXROM
129
130 */
131
132 m_reset = 0;
133
134 m_socket = data & 0x07;
135 m_bank = (data >> 4) & 0x03;
136
137 m_exrom = BIT(data, 7);
138 }
139 }
140