1 // license:BSD-3-Clause
2 // copyright-holders:Curt Coder
3 /**********************************************************************
4 
5     Easy Calc Result cartridge emulation
6 
7 **********************************************************************/
8 
9 /*
10 
11     PCB Layout
12     ----------
13 
14     |===========================|
15     |=|                         |
16     |=|     ROM0        LS73    |
17     |=|                         |
18     |=|                         |
19     |=|                         |
20     |=|                         |
21     |=|     ROM1        LS00    |
22     |=|                         |
23     |===========================|
24 
25     ROM0  - Hitachi HN61364P 8Kx8 EPROM "CR2001"
26     ROM1  - Hitachi HN613128P 16Kx8 EPROM "CR3001"
27 
28 */
29 
30 #include "emu.h"
31 #include "easy_calc_result.h"
32 
33 
34 
35 //**************************************************************************
36 //  DEVICE DEFINITIONS
37 //**************************************************************************
38 
39 DEFINE_DEVICE_TYPE(C64_EASY_CALC_RESULT, c64_easy_calc_result_cartridge_device, "c64_easy_calc_result", "C64 Easy Calc Result cartridge")
40 
41 
42 
43 //**************************************************************************
44 //  LIVE DEVICE
45 //**************************************************************************
46 
47 //-------------------------------------------------
48 //  c64_easy_calc_result_cartridge_device - constructor
49 //-------------------------------------------------
50 
c64_easy_calc_result_cartridge_device(const machine_config & mconfig,const char * tag,device_t * owner,uint32_t clock)51 c64_easy_calc_result_cartridge_device::c64_easy_calc_result_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
52 	device_t(mconfig, C64_EASY_CALC_RESULT, tag, owner, clock),
53 	device_c64_expansion_card_interface(mconfig, *this), m_bank(0)
54 {
55 }
56 
57 
58 //-------------------------------------------------
59 //  device_start - device-specific startup
60 //-------------------------------------------------
61 
device_start()62 void c64_easy_calc_result_cartridge_device::device_start()
63 {
64 	// state saving
65 	save_item(NAME(m_bank));
66 }
67 
68 
69 //-------------------------------------------------
70 //  device_reset - device-specific reset
71 //-------------------------------------------------
72 
device_reset()73 void c64_easy_calc_result_cartridge_device::device_reset()
74 {
75 	m_bank = 0;
76 }
77 
78 
79 //-------------------------------------------------
80 //  c64_cd_r - cartridge data read
81 //-------------------------------------------------
82 
c64_cd_r(offs_t offset,uint8_t data,int sphi2,int ba,int roml,int romh,int io1,int io2)83 uint8_t c64_easy_calc_result_cartridge_device::c64_cd_r(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
84 {
85 	if (!roml)
86 	{
87 		data = m_roml[offset & 0x1fff];
88 	}
89 	else if (!romh)
90 	{
91 		data = m_romh[(m_bank << 13) | (offset & 0x1fff)];
92 	}
93 
94 	return data;
95 }
96 
97 
98 //-------------------------------------------------
99 //  c64_cd_w - cartridge data write
100 //-------------------------------------------------
101 
c64_cd_w(offs_t offset,uint8_t data,int sphi2,int ba,int roml,int romh,int io1,int io2)102 void c64_easy_calc_result_cartridge_device::c64_cd_w(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
103 {
104 	if (!io1)
105 	{
106 		m_bank = !BIT(offset, 0);
107 	}
108 }
109