diff options
Diffstat (limited to 'src/devices/bus/vip/vp570.c')
-rw-r--r-- | src/devices/bus/vip/vp570.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/src/devices/bus/vip/vp570.c b/src/devices/bus/vip/vp570.c new file mode 100644 index 00000000000..42ec4119c21 --- /dev/null +++ b/src/devices/bus/vip/vp570.c @@ -0,0 +1,120 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + RCA VIP Expansion Board VP-570 emulation + +**********************************************************************/ + +#include "vp570.h" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type VP570 = &device_creator<vp570_device>; + + +//------------------------------------------------- +// INPUT_PORTS( vp570 ) +//------------------------------------------------- + +static INPUT_PORTS_START( vp570 ) + PORT_START("BASE") + PORT_DIPNAME( 0x07, 0x01, "Address Range" ) + PORT_DIPSETTING( 0x00, "0000 thru 0FFF" ) + PORT_DIPSETTING( 0x01, "1000 thru 1FFF" ) + PORT_DIPSETTING( 0x02, "2000 thru 2FFF" ) + PORT_DIPSETTING( 0x03, "3000 thru 3FFF" ) + PORT_DIPSETTING( 0x04, "4000 thru 4FFF" ) + PORT_DIPSETTING( 0x05, "5000 thru 50FFF" ) + PORT_DIPSETTING( 0x06, "6000 thru 6FFF" ) + PORT_DIPSETTING( 0x07, "7000 thru 7FFF" ) + + PORT_START("SW1") + PORT_DIPNAME( 0x01, 0x01, "Write Protect" ) + PORT_DIPSETTING( 0x01, DEF_STR( Off ) ) + PORT_DIPSETTING( 0x00, DEF_STR( On ) ) +INPUT_PORTS_END + + +//------------------------------------------------- +// input_ports - device-specific input ports +//------------------------------------------------- + +ioport_constructor vp570_device::device_input_ports() const +{ + return INPUT_PORTS_NAME( vp570 ); +} + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// vp570_device - constructor +//------------------------------------------------- + +vp570_device::vp570_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, VP570, "VP570", tag, owner, clock, "vp570", __FILE__), + device_vip_expansion_card_interface(mconfig, *this), + m_ram(*this, "ram"), + m_base(*this, "BASE"), + m_sw1(*this, "SW1") +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void vp570_device::device_start() +{ + m_ram.allocate(0x1000); +} + + +//------------------------------------------------- +// vip_program_r - program read +//------------------------------------------------- + +UINT8 vp570_device::vip_program_r(address_space &space, offs_t offset, int cs, int cdef, int *minh) +{ + UINT8 data = 0xff; + + offs_t base = m_base->read() << 12; + + if (offset >= base && offset < base + 0x1000) + { + *minh = 1; + + data = m_ram[offset & 0xfff]; + } + + return data; +} + + +//------------------------------------------------- +// vip_program_w - program write +//------------------------------------------------- + +void vp570_device::vip_program_w(address_space &space, offs_t offset, UINT8 data, int cdef, int *minh) +{ + offs_t base = m_base->read() << 12; + + if (offset >= base && offset < base + 0x1000) + { + *minh = 1; + + if (m_sw1->read()) + { + m_ram[offset & 0xfff] = data; + } + } +} |