1 // license:BSD-3-Clause
2 // copyright-holders:Curt Coder
3 /**********************************************************************
4 
5     REX Datentechnik cartridge emulation
6 
7 **********************************************************************/
8 
9 #include "emu.h"
10 #include "rex.h"
11 
12 
13 
14 //**************************************************************************
15 //  DEVICE DEFINITIONS
16 //**************************************************************************
17 
18 DEFINE_DEVICE_TYPE(C64_REX, c64_rex_cartridge_device, "c64_rex", "C64 Rex cartridge")
19 
20 
21 
22 //**************************************************************************
23 //  LIVE DEVICE
24 //**************************************************************************
25 
26 //-------------------------------------------------
27 //  c64_rex_cartridge_device - constructor
28 //-------------------------------------------------
29 
c64_rex_cartridge_device(const machine_config & mconfig,const char * tag,device_t * owner,uint32_t clock)30 c64_rex_cartridge_device::c64_rex_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
31 	device_t(mconfig, C64_REX, tag, owner, clock),
32 	device_c64_expansion_card_interface(mconfig, *this)
33 {
34 }
35 
36 
37 //-------------------------------------------------
38 //  device_start - device-specific startup
39 //-------------------------------------------------
40 
device_start()41 void c64_rex_cartridge_device::device_start()
42 {
43 }
44 
45 
46 //-------------------------------------------------
47 //  device_reset - device-specific reset
48 //-------------------------------------------------
49 
device_reset()50 void c64_rex_cartridge_device::device_reset()
51 {
52 	m_exrom = 0;
53 }
54 
55 
56 //-------------------------------------------------
57 //  c64_cd_r - cartridge data read
58 //-------------------------------------------------
59 
c64_cd_r(offs_t offset,uint8_t data,int sphi2,int ba,int roml,int romh,int io1,int io2)60 uint8_t c64_rex_cartridge_device::c64_cd_r(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
61 {
62 	if (!roml)
63 	{
64 		data = m_roml[offset & 0x1fff];
65 	}
66 	else if (!io2)
67 	{
68 		if ((offset & 0xc0) == 0xc0)
69 		{
70 			m_exrom = 0;
71 		}
72 		else
73 		{
74 			m_exrom = 1;
75 		}
76 	}
77 
78 	return data;
79 }
80