1 // license:BSD-3-Clause
2 // copyright-holders:Curt Coder
3 /**********************************************************************
4
5 Commodore 1700/1750/1764 RAM Expansion Unit emulation
6
7 **********************************************************************/
8
9 #include "emu.h"
10 #include "reu.h"
11
12
13
14 //**************************************************************************
15 // MACROS / CONSTANTS
16 //**************************************************************************
17
18 #define MOS8726R1_TAG "u1"
19
20
21 //**************************************************************************
22 // DEVICE DEFINITIONS
23 //**************************************************************************
24
25 DEFINE_DEVICE_TYPE(C64_REU1700, c64_reu1700_cartridge_device, "c64_1700reu", "1700 RAM Expansion Unit")
26 DEFINE_DEVICE_TYPE(C64_REU1750, c64_reu1750_cartridge_device, "c64_1750reu", "1750 RAM Expansion Unit")
27 DEFINE_DEVICE_TYPE(C64_REU1764, c64_reu1764_cartridge_device, "c64_1764reu", "1764 RAM Expansion Unit")
28
29
30 //-------------------------------------------------
31 // device_add_mconfig - add device configuration
32 //-------------------------------------------------
33
device_add_mconfig(machine_config & config)34 void c64_reu_cartridge_device::device_add_mconfig(machine_config &config)
35 {
36 MOS8726(config, m_dmac, 1000000); // dummy clock
37
38 GENERIC_SOCKET(config, m_eprom, generic_linear_slot, nullptr, "bin,rom");
39 }
40
41
42
43 //**************************************************************************
44 // LIVE DEVICE
45 //**************************************************************************
46
47 //-------------------------------------------------
48 // c64_reu_cartridge_device - constructor
49 //-------------------------------------------------
50
c64_reu_cartridge_device(const machine_config & mconfig,device_type type,const char * tag,device_t * owner,uint32_t clock,uint32_t variant,int jp1,size_t ram_size)51 c64_reu_cartridge_device::c64_reu_cartridge_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock, uint32_t variant, int jp1, size_t ram_size) :
52 device_t(mconfig, type, tag, owner, clock),
53 device_c64_expansion_card_interface(mconfig, *this),
54 m_dmac(*this, MOS8726R1_TAG),
55 m_eprom(*this, "rom"),
56 m_ram(*this, "ram"),
57 m_variant(variant),
58 m_jp1(jp1),
59 m_ram_size(ram_size)
60 {
61 }
62
c64_reu1700_cartridge_device(const machine_config & mconfig,const char * tag,device_t * owner,uint32_t clock)63 c64_reu1700_cartridge_device::c64_reu1700_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
64 : c64_reu_cartridge_device(mconfig, C64_REU1700, tag, owner, clock, TYPE_1700, 0, 128 * 1024) { }
65
c64_reu1750_cartridge_device(const machine_config & mconfig,const char * tag,device_t * owner,uint32_t clock)66 c64_reu1750_cartridge_device::c64_reu1750_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
67 : c64_reu_cartridge_device(mconfig, C64_REU1750, tag, owner, clock, TYPE_1750, 1, 256 * 1024) { }
68
c64_reu1764_cartridge_device(const machine_config & mconfig,const char * tag,device_t * owner,uint32_t clock)69 c64_reu1764_cartridge_device::c64_reu1764_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
70 : c64_reu_cartridge_device(mconfig, C64_REU1764, tag, owner, clock, TYPE_1764, 1, 512 * 1024) { }
71
72
73 //-------------------------------------------------
74 // device_start - device-specific startup
75 //-------------------------------------------------
76
device_start()77 void c64_reu_cartridge_device::device_start()
78 {
79 // allocate memory
80 m_ram.allocate(m_ram_size);
81
82 // setup DMA controller
83 m_dmac->set_unscaled_clock(m_slot->phi2());
84 m_dmac->bs_w(m_jp1);
85 }
86
87
88 //-------------------------------------------------
89 // device_reset - device-specific reset
90 //-------------------------------------------------
91
device_reset()92 void c64_reu_cartridge_device::device_reset()
93 {
94 m_dmac->reset();
95 }
96
97
98 //-------------------------------------------------
99 // c64_cd_r - cartridge data read
100 //-------------------------------------------------
101
c64_cd_r(offs_t offset,uint8_t data,int sphi2,int ba,int roml,int romh,int io1,int io2)102 uint8_t c64_reu_cartridge_device::c64_cd_r(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
103 {
104 if (!m_dmac->romsel_r(roml, romh))
105 {
106 data = m_eprom->read_rom(offset & 0x7fff);
107 }
108 else if (!io2)
109 {
110 data = m_dmac->read(offset);
111 }
112
113 return data;
114 }
115
116
117 //-------------------------------------------------
118 // c64_cd_w - cartridge data write
119 //-------------------------------------------------
120
c64_cd_w(offs_t offset,uint8_t data,int sphi2,int ba,int roml,int romh,int io1,int io2)121 void c64_reu_cartridge_device::c64_cd_w(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
122 {
123 if (!io2)
124 {
125 m_dmac->write(offset, data);
126 }
127 }
128