summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/vidbrain/timeshare.cpp
blob: 29edfaa1858620d3eeae874f44e3969dfbe0677a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************

    VideoBrain Timeshare cartridge emulation

**********************************************************************/

#include "emu.h"
#include "timeshare.h"



//**************************************************************************
//  DEVICE DEFINITIONS
//**************************************************************************

DEFINE_DEVICE_TYPE(VB_TIMESHARE, videobrain_timeshare_cartridge_device, "vb_timeshare", "VideoBrain Timeshare cartridge")



//**************************************************************************
//  LIVE DEVICE
//**************************************************************************

//-------------------------------------------------
//  videobrain_timeshare_cartridge_device - constructor
//-------------------------------------------------

videobrain_timeshare_cartridge_device::videobrain_timeshare_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) :
	device_t(mconfig, VB_TIMESHARE, tag, owner, clock),
	device_videobrain_expansion_card_interface(mconfig, *this)
{
}


//-------------------------------------------------
//  device_start - device-specific startup
//-------------------------------------------------

void videobrain_timeshare_cartridge_device::device_start()
{
}


//-------------------------------------------------
//  videobrain_bo_r - cartridge data read
//-------------------------------------------------

uint8_t videobrain_timeshare_cartridge_device::videobrain_bo_r(offs_t offset, int cs1, int cs2)
{
	uint8_t data = 0;

	if (!cs1)
	{
		data = m_rom[offset & m_rom_mask];
	}
	else if (!cs2)
	{
		data = m_ram[offset & m_ram_mask];
	}
	return data;
}


//-------------------------------------------------
//  videobrain_bo_w - cartridge data write
//-------------------------------------------------

void videobrain_timeshare_cartridge_device::videobrain_bo_w(offs_t offset, uint8_t data, int cs1, int cs2)
{
	if (!cs2)
	{
		m_ram[offset & m_ram_mask] = data;
	}
}