// license:BSD-3-Clause // copyright-holders:Nigel Barnes /********************************************************************** TUG Programmable Graphic Module http://www.microtan.ukpc.net/pageProducts.html#VIDEO **********************************************************************/ #include "emu.h" #include "tugpgm.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(TANBUS_TUGPGM, tanbus_tugpgm_device, "tanbus_tugpgm", "TUG Programmable Graphic Module") //------------------------------------------------- // INPUT_PORTS( tugpgm ) //------------------------------------------------- INPUT_PORTS_START(tugpgm) PORT_START("LINKS") PORT_DIPNAME(0x07, 0x04, "Address Select") PORT_DIPSETTING(0x00, "$0400 - $07FF (Not Recommended)") PORT_DIPSETTING(0x01, "$2400 - $27FF") PORT_DIPSETTING(0x02, "$4400 - $47FF") PORT_DIPSETTING(0x03, "$6400 - $67FF") PORT_DIPSETTING(0x04, "$8400 - $87FF") PORT_DIPSETTING(0x05, "$A400 - $A7FF") PORT_DIPSETTING(0x06, "$C400 - $C7FF") PORT_DIPSETTING(0x07, "$E400 - $E7FF") INPUT_PORTS_END //------------------------------------------------- // input_ports - device-specific input ports //------------------------------------------------- ioport_constructor tanbus_tugpgm_device::device_input_ports() const { return INPUT_PORTS_NAME(tugpgm); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // tanbus_tugpgm_device - constructor //------------------------------------------------- tanbus_tugpgm_device::tanbus_tugpgm_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, TANBUS_TUGPGM, tag, owner, clock) , device_tanbus_interface(mconfig, *this) , m_links(*this, "LINKS") { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void tanbus_tugpgm_device::device_start() { m_ram = std::make_unique(0x0400); /* randomize video memory contents */ for (uint16_t addr = 0; addr < 0x0400; addr++) { m_ram[addr] = machine().rand() & 0xff; m_tanbus->pgm_w(addr, m_ram[addr]); } save_pointer(NAME(m_ram), 0x0400); } //------------------------------------------------- // read - card read //------------------------------------------------- uint8_t tanbus_tugpgm_device::read(offs_t offset, int inhrom, int inhram, int be) { uint8_t data = 0xff; if ((offset & 0xfc00) == ((m_links->read() << 13) | 0x0400)) { data = m_ram[offset & 0x3ff]; } return data; } //------------------------------------------------- // write - card write //------------------------------------------------- void tanbus_tugpgm_device::write(offs_t offset, uint8_t data, int inhrom, int inhram, int be) { if ((offset & 0xfc00) == ((m_links->read() << 13) | 0x0400)) { m_ram[offset & 0x3ff] = data; /* update the chargen on the CPU board */ m_tanbus->pgm_w(offset & 0x3ff, data); } }