diff options
-rw-r--r-- | src/mame/drivers/att630.cpp | 85 |
1 files changed, 77 insertions, 8 deletions
diff --git a/src/mame/drivers/att630.cpp b/src/mame/drivers/att630.cpp index 6a9995ce819..883e2e04f68 100644 --- a/src/mame/drivers/att630.cpp +++ b/src/mame/drivers/att630.cpp @@ -9,6 +9,7 @@ Skeleton driver for AT&T 630 MTG terminal. #include "emu.h" #include "cpu/m68000/m68000.h" #include "machine/mc68681.h" +#include "machine/nvram.h" #include "screen.h" class att630_state : public driver_device @@ -22,15 +23,40 @@ public: void att630(machine_config &config); +protected: + virtual void machine_start() override; + private: u32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect); + template<int Line> DECLARE_WRITE_LINE_MEMBER(irq_w); + TIMER_CALLBACK_MEMBER(update_interrupts); + + u8 bram_r(offs_t offset); + void bram_w(offs_t offset, u8 data); + u8 irq_vec_r(); + void mem_map(address_map &map); + void vec_map(address_map &map); required_device<cpu_device> m_maincpu; required_shared_ptr<u16> m_vram; + + std::unique_ptr<u8[]> m_bram_data; + u8 m_pending_interrupts; }; +void att630_state::machine_start() +{ + m_bram_data = std::make_unique<u8[]>(0x2000); + subdevice<nvram_device>("bram")->set_base(m_bram_data.get(), 0x2000); + + m_pending_interrupts = 0; + + save_pointer(NAME(m_bram_data), 0x2000); + save_item(NAME(m_pending_interrupts)); +} + u32 att630_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect) { for (int y = 0; y < 1024; y++) @@ -40,6 +66,44 @@ u32 att630_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, con return 0; } +template <int Line> +WRITE_LINE_MEMBER(att630_state::irq_w) +{ + if (BIT(m_pending_interrupts, Line) == state) + return; + + if (state) + m_pending_interrupts |= 0x01 << Line; + else + m_pending_interrupts &= ~(0x01 << Line); + + machine().scheduler().synchronize(timer_expired_delegate(FUNC(att630_state::update_interrupts), this)); +} + +TIMER_CALLBACK_MEMBER(att630_state::update_interrupts) +{ + m_maincpu->set_input_line(M68K_IRQ_1, m_pending_interrupts != 0 ? ASSERT_LINE : CLEAR_LINE); +} + +u8 att630_state::irq_vec_r() +{ + for (int level = 7; level > 0; level--) + if (BIT(m_pending_interrupts, level)) + return 0x40 + level; + + return 0x40; +} + +u8 att630_state::bram_r(offs_t offset) +{ + return m_bram_data[offset]; +} + +void att630_state::bram_w(offs_t offset, u8 data) +{ + m_bram_data[offset] = data; +} + void att630_state::mem_map(address_map &map) { map(0x000000, 0x03ffff).rom().region("maincpu", 0); @@ -51,8 +115,12 @@ void att630_state::mem_map(address_map &map) // map(0x700000, 0x75ffff).noprw(); // video controller map(0x760000, 0x77ffff).ram().share("vram"); map(0x780000, 0x7fffff).ram(); // program ram - map(0xe00000, 0xe03fff).noprw(); // 0x00ff mask (bram) - map(0xfee000, 0xffffff).noprw(); // nvram (size unknown) + map(0xe00000, 0xe03fff).mirror(0x1fc000).rw(FUNC(att630_state::bram_r), FUNC(att630_state::bram_w)).umask16(0x00ff); +} + +void att630_state::vec_map(address_map &map) +{ + map(0xfffff3, 0xfffff3).r(FUNC(att630_state::irq_vec_r)); } static INPUT_PORTS_START( att630 ) @@ -62,17 +130,18 @@ void att630_state::att630(machine_config &config) { M68000(config, m_maincpu, 40_MHz_XTAL / 4); // clock not confirmed m_maincpu->set_addrmap(AS_PROGRAM, &att630_state::mem_map); - // TODO: interrupt vector callback + m_maincpu->set_addrmap(m68000_device::AS_CPU_SPACE, &att630_state::vec_map); + + NVRAM(config, "bram", nvram_device::DEFAULT_ALL_0); // 5264 + battery screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER)); screen.set_raw(87.18336_MHz_XTAL, 1376, 0, 1024, 1056, 0, 1024); + screen.set_color(rgb_t::amber()); screen.set_screen_update(FUNC(att630_state::screen_update)); - scn2681_device &duart1(SCN2681(config, "duart1", 3.6864_MHz_XTAL)); - duart1.irq_cb().set_inputline(m_maincpu, M68K_IRQ_1); + SCN2681(config, "duart1", 3.6864_MHz_XTAL); - scn2681_device &duart2(SCN2681(config, "duart2", 3.6864_MHz_XTAL)); - duart2.irq_cb().set_inputline(m_maincpu, M68K_IRQ_1); + SCN2681(config, "duart2", 3.6864_MHz_XTAL); } @@ -92,4 +161,4 @@ ROM_START( att630 ) ROM_LOAD16_BYTE( "460622-1.bin", 0x20001, 0x10000, CRC(c108c1e0) SHA1(ef01349e890b8a4117c01e78d1c23fbd113ba58f) ) ROM_END -COMP( 1987, att630, 0, 0, att630, att630, att630_state, empty_init, "AT&T", "630 MTG", MACHINE_IS_SKELETON ) +COMP( 1986, att630, 0, 0, att630, att630, att630_state, empty_init, "AT&T", "630 MTG", MACHINE_IS_SKELETON ) |