1 // license:BSD-3-Clause
2 // copyright-holders:Curt Coder
3 /**********************************************************************
4 
5     Rex ExOS cartridge emulation
6 
7 **********************************************************************/
8 
9 #include "emu.h"
10 #include "exos.h"
11 
12 
13 
14 //**************************************************************************
15 //  DEVICE DEFINITIONS
16 //**************************************************************************
17 
18 DEFINE_DEVICE_TYPE(C64_EXOS, c64_exos_cartridge_device, "c64_exos", "C64 ExOS cartridge")
19 
20 
21 
22 //**************************************************************************
23 //  LIVE DEVICE
24 //**************************************************************************
25 
26 //-------------------------------------------------
27 //  c64_exos_cartridge_device - constructor
28 //-------------------------------------------------
29 
c64_exos_cartridge_device(const machine_config & mconfig,const char * tag,device_t * owner,uint32_t clock)30 c64_exos_cartridge_device::c64_exos_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
31 	device_t(mconfig, C64_EXOS, 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_exos_cartridge_device::device_start()
42 {
43 }
44 
45 
46 //-------------------------------------------------
47 //  c64_cd_r - cartridge data read
48 //-------------------------------------------------
49 
c64_cd_r(offs_t offset,uint8_t data,int sphi2,int ba,int roml,int romh,int io1,int io2)50 uint8_t c64_exos_cartridge_device::c64_cd_r(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
51 {
52 	if (!romh)
53 	{
54 		data = m_romh[offset & 0x1fff];
55 	}
56 
57 	return data;
58 }
59 
60 
61 //-------------------------------------------------
62 //  c64_game_r - GAME read
63 //-------------------------------------------------
64 
c64_game_r(offs_t offset,int sphi2,int ba,int rw)65 int c64_exos_cartridge_device::c64_game_r(offs_t offset, int sphi2, int ba, int rw)
66 {
67 	return !(ba & rw & ((offset & 0xe000) == 0xe000) & m_slot->hiram());
68 }
69