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Diffstat (limited to 'src/mame/microterm/mt420.cpp')
-rw-r--r-- | src/mame/microterm/mt420.cpp | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/src/mame/microterm/mt420.cpp b/src/mame/microterm/mt420.cpp new file mode 100644 index 00000000000..3842a0fac21 --- /dev/null +++ b/src/mame/microterm/mt420.cpp @@ -0,0 +1,179 @@ +// license:BSD-3-Clause +// copyright-holders:AJR +/*********************************************************************************************************************************** + +Skeleton driver for Micro-Term Model 420 terminal. + +************************************************************************************************************************************/ + +#include "emu.h" +#include "cpu/z80/z80.h" +#include "machine/eepromser.h" +#include "machine/input_merger.h" +#include "machine/mc68681.h" +#include "machine/scn_pci.h" +#include "video/scn2674.h" +#include "screen.h" + +namespace { + +class mt420_state : public driver_device +{ +public: + mt420_state(const machine_config &mconfig, device_type type, const char *tag) + : driver_device(mconfig, type, tag) + , m_maincpu(*this, "maincpu") + , m_mainnmi(*this, "mainnmi") + , m_screen(*this, "screen") + , m_chargen(*this, "chargen") + , m_attrram(*this, "attrram") + , m_cgram(*this, "cgram") + , m_vram_view(*this, "vram") + , m_avdc_intr(false) + { + } + + void mt420(machine_config &config); + +private: + SCN2674_DRAW_CHARACTER_MEMBER(draw_character); + void avdc_intr_w(int state); + + void control_w(u8 data); + u8 attr_r(offs_t offset); + + void mem_map(address_map &map) ATTR_COLD; + void io_map(address_map &map) ATTR_COLD; + void chars_map(address_map &map) ATTR_COLD; + void attrs_map(address_map &map) ATTR_COLD; + + required_device<cpu_device> m_maincpu; + required_device<input_merger_device> m_mainnmi; + required_device<screen_device> m_screen; + required_region_ptr<u8> m_chargen; + required_shared_ptr<u8> m_attrram; + required_shared_ptr<u8> m_cgram; + memory_view m_vram_view; + + bool m_avdc_intr; +}; + +void mt420_state::avdc_intr_w(int state) +{ + m_avdc_intr = state; +} + +SCN2674_DRAW_CHARACTER_MEMBER(mt420_state::draw_character) +{ + u16 dots = BIT(charcode, 7) ? m_cgram[u8(charcode & 0x7f) << 4 | linecount] : m_chargen[linecount << 7 | charcode]; + dots |= dots << 1; + + for (int i = 0; i < 12; i++) + { + bitmap.pix(y, x++) = BIT(dots, 8) ? rgb_t::white() : rgb_t::black(); + if (i < 8) + dots <<= 1; + } +} + +void mt420_state::control_w(u8 data) +{ + m_vram_view.select(BIT(data, 1)); + m_mainnmi->in_w<1>(!BIT(data, 4)); +} + +u8 mt420_state::attr_r(offs_t offset) +{ + // TBD: Bit 7 is special, but what is its source? + return (m_attrram[offset] & 0x7f) | (m_screen->vblank() || m_screen->hblank() || m_avdc_intr ? 0x80 : 0); +} + +void mt420_state::mem_map(address_map &map) +{ + map(0x0000, 0x7fff).rom().region("maincpu", 0); + map(0x8000, 0x87ff).ram().share("cgram"); + map(0x9000, 0x9000).w(FUNC(mt420_state::control_w)); + map(0xc000, 0xcfff).writeonly().share("attrram").r(FUNC(mt420_state::attr_r)); + map(0xe000, 0xefff).view(m_vram_view); + m_vram_view[0](0xeff8, 0xefff).rw("avdc", FUNC(scn2674_device::read), FUNC(scn2674_device::write)); + m_vram_view[1](0xe000, 0xefff).ram().share("charram"); + map(0xf000, 0xf7ff).ram(); +} + +void mt420_state::io_map(address_map &map) +{ + map.global_mask(0xff); + map(0xe0, 0xef).rw("duart", FUNC(scn2681_device::read), FUNC(scn2681_device::write)); + map(0xf0, 0xf3).rw("aci", FUNC(scn2641_device::read), FUNC(scn2641_device::write)); +} + +void mt420_state::chars_map(address_map &map) +{ + map(0x0000, 0x0fff).ram().share("charram"); + map(0x2000, 0x27ff).ram().share("cgram"); +} + +void mt420_state::attrs_map(address_map &map) +{ + map(0x0000, 0x0fff).ram().share("attrram"); +} + +static INPUT_PORTS_START(mt420) +INPUT_PORTS_END + +void mt420_state::mt420(machine_config &config) +{ + Z80(config, m_maincpu, 4'000'000); + m_maincpu->set_addrmap(AS_PROGRAM, &mt420_state::mem_map); + m_maincpu->set_addrmap(AS_IO, &mt420_state::io_map); + + INPUT_MERGER_ANY_HIGH(config, "mainint").output_handler().set_inputline(m_maincpu, 0); + INPUT_MERGER_ALL_HIGH(config, m_mainnmi).output_handler().set_inputline(m_maincpu, INPUT_LINE_NMI); + + scn2681_device &duart(SCN2681(config, "duart", 3.6864_MHz_XTAL)); // MC2681 + duart.irq_cb().set("mainint", FUNC(input_merger_device::in_w<0>)); + duart.outport_cb().set("eeprom", FUNC(eeprom_serial_93cxx_device::di_write)).bit(5); + duart.outport_cb().append("eeprom", FUNC(eeprom_serial_93cxx_device::cs_write)).bit(4); + duart.outport_cb().append("eeprom", FUNC(eeprom_serial_93cxx_device::clk_write)).bit(3); + + scn2641_device &aci(SCN2641(config, "aci", 3.6864_MHz_XTAL)); + aci.intr_handler().set("mainint", FUNC(input_merger_device::in_w<1>)); + + EEPROM_93C46_16BIT(config, "eeprom").do_callback().set("duart", FUNC(scn2681_device::ip6_w)); + + screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER)); + screen.set_raw(9.87768_MHz_XTAL * 2, 612 * 2, 0, 480 * 2, 269, 0, 250); + //screen.set_raw(15.30072_MHz_XTAL * 2, 948 * 2, 0, 792 * 2, 269, 0, 250); + screen.set_screen_update("avdc", FUNC(scn2674_device::screen_update)); + + scn2674_device &avdc(SCN2674(config, "avdc", 9.87768_MHz_XTAL / 6)); + //avdc.set_clock(15.30072_MHz_XTAL / 6); + avdc.set_character_width(12); + avdc.intr_callback().set(m_mainnmi, FUNC(input_merger_device::in_w<0>)); + avdc.intr_callback().append(FUNC(mt420_state::avdc_intr_w)); + avdc.set_display_callback(FUNC(mt420_state::draw_character)); + avdc.set_addrmap(0, &mt420_state::chars_map); + avdc.set_addrmap(1, &mt420_state::attrs_map); + avdc.set_screen("screen"); +} + + +/************************************************************************************************************** + +Micro-Term Model 420. +Chips: Z80, MC2681P, SCN2674, 2x CDM6264E3, TMM2016BP-12, SCN2641, NMC9345N. Undumped PAL10L8NC at U18 and PROM (N82S129N) at U41. +Crystals: 3.6864, 15.30072 (hard to read), 9.87768 + +***************************************************************************************************************/ + +ROM_START(mt420) + ROM_REGION(0x10000, "maincpu", 0) + ROM_LOAD( "1910_m.p._r1.9.u8", 0x0000, 0x8000, CRC(e79154e9) SHA1(7c3f22097b931986c921bf731de98a1d0536aec9) ) + + ROM_REGION(0x1000, "chargen", 0) + ROM_LOAD( "mt420cg_rev2.1.u44", 0x0000, 0x0fe0, CRC(7950e485) SHA1(1f03525958464bbe861d2e78f07cc5264e17c0e8) ) // incomplete? +ROM_END + +} // anonymous namespace + +COMP(1986, mt420, 0, 0, mt420, mt420, mt420_state, empty_init, "Micro-Term", "Micro-Term 420", MACHINE_NO_SOUND | MACHINE_NOT_WORKING) |