1 // license:BSD-3-Clause
2 // copyright-holders:Curt Coder
3 /**********************************************************************
4
5 Commodore Super Games cartridge emulation
6
7 **********************************************************************/
8
9 #include "emu.h"
10 #include "super_games.h"
11
12
13
14 //**************************************************************************
15 // DEVICE DEFINITIONS
16 //**************************************************************************
17
18 DEFINE_DEVICE_TYPE(C64_SUPER_GAMES, c64_super_games_cartridge_device, "c64_super_games", "C64 Super Games cartridge")
19
20
21
22 //**************************************************************************
23 // LIVE DEVICE
24 //**************************************************************************
25
26 //-------------------------------------------------
27 // c64_super_games_cartridge_device - constructor
28 //-------------------------------------------------
29
c64_super_games_cartridge_device(const machine_config & mconfig,const char * tag,device_t * owner,uint32_t clock)30 c64_super_games_cartridge_device::c64_super_games_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
31 device_t(mconfig, C64_SUPER_GAMES, tag, owner, clock),
32 device_c64_expansion_card_interface(mconfig, *this),
33 m_bank(0)
34 {
35 }
36
37
38 //-------------------------------------------------
39 // device_start - device-specific startup
40 //-------------------------------------------------
41
device_start()42 void c64_super_games_cartridge_device::device_start()
43 {
44 // state saving
45 save_item(NAME(m_bank));
46 }
47
48
49 //-------------------------------------------------
50 // device_reset - device-specific reset
51 //-------------------------------------------------
52
device_reset()53 void c64_super_games_cartridge_device::device_reset()
54 {
55 m_bank = 0;
56 }
57
58
59 //-------------------------------------------------
60 // c64_cd_r - cartridge data read
61 //-------------------------------------------------
62
c64_cd_r(offs_t offset,uint8_t data,int sphi2,int ba,int roml,int romh,int io1,int io2)63 uint8_t c64_super_games_cartridge_device::c64_cd_r(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
64 {
65 if (!roml || !romh)
66 {
67 offs_t addr = (m_bank << 14) | (offset & 0x3fff);
68 data = m_roml[addr];
69 }
70
71 return data;
72 }
73
74
75 //-------------------------------------------------
76 // c64_cd_w - cartridge data write
77 //-------------------------------------------------
78
c64_cd_w(offs_t offset,uint8_t data,int sphi2,int ba,int roml,int romh,int io1,int io2)79 void c64_super_games_cartridge_device::c64_cd_w(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
80 {
81 if (!io2)
82 {
83 m_bank = data & 0x03;
84
85 if (BIT(data, 2))
86 {
87 if (BIT(data, 3))
88 {
89 m_game = 1;
90 m_exrom = 1;
91 }
92 else
93 {
94 m_game = 1;
95 m_exrom = 0;
96 }
97 }
98 else
99 {
100 m_game = 0;
101 m_exrom = 0;
102 }
103 }
104 }
105