diff options
Diffstat (limited to 'src/mame/drivers/itt1700.cpp')
-rw-r--r-- | src/mame/drivers/itt1700.cpp | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/src/mame/drivers/itt1700.cpp b/src/mame/drivers/itt1700.cpp index 7bdb2fe4b79..13e83c14c6c 100644 --- a/src/mame/drivers/itt1700.cpp +++ b/src/mame/drivers/itt1700.cpp @@ -19,8 +19,11 @@ This device may be related to the Intel 8251, but it is definitely not a SCN2651 #include "cpu/z80/z80.h" #include "cpu/mcs48/mcs48.h" #include "machine/itt1700_kbd.h" +#include "sound/dac.h" +#include "sound/volt_reg.h" #include "video/mc6845.h" #include "screen.h" +#include "speaker.h" class itt1700_state : public driver_device @@ -29,6 +32,7 @@ public: itt1700_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag) , m_maincpu(*this, "maincpu") + , m_videoram(*this, "videoram") , m_chargen(*this, "chargen") { } @@ -42,18 +46,33 @@ private: void io_map(address_map &map); required_device<cpu_device> m_maincpu; + required_shared_ptr<u8> m_videoram; required_region_ptr<u8> m_chargen; }; MC6845_UPDATE_ROW(itt1700_state::update_row) { + u32 *px = &bitmap.pix32(y); + u16 page = 0x800; + + for (int i = 0; i < x_count; i++) + { + u8 chr = m_videoram[((ma + i) & 0x7ff) | page]; + u16 dots = m_chargen[u16(chr) << 4 | ra] << 1; + rgb_t fg = rgb_t::white(); + rgb_t bg = rgb_t::black(); + + for (int n = 9; n > 0; n--, dots <<= 1) + *px++ = BIT(dots, 8) ? fg : bg; + } } void itt1700_state::mem_map(address_map &map) { map(0x0000, 0x0fff).rom().region("maincpu", 0); - map(0x2000, 0x7fff).ram(); + map(0x2000, 0x3fff).ram().share("videoram"); + map(0x4000, 0x7fff).ram(); map(0x8000, 0x8000).nopr(); } @@ -78,6 +97,7 @@ void itt1700_state::itt1700(machine_config &config) upi.p1_out_cb().set("keyboard", FUNC(itt1700_keyboard_device::clock_w)).bit(0); upi.p1_out_cb().append("keyboard", FUNC(itt1700_keyboard_device::line1_w)).bit(1); upi.p1_out_cb().append("keyboard", FUNC(itt1700_keyboard_device::line2_w)).bit(2); + upi.p2_out_cb().set("dac", FUNC(dac_byte_interface::write)).mask(0x07); upi.t0_in_cb().set("keyboard", FUNC(itt1700_keyboard_device::sense_r)); ITT1700_KEYBOARD(config, "keyboard"); @@ -91,6 +111,12 @@ void itt1700_state::itt1700(machine_config &config) crtc.set_screen("screen"); crtc.set_show_border_area(false); crtc.set_update_row_callback(FUNC(itt1700_state::update_row), this); + + SPEAKER(config, "speaker").front_center(); + + DAC_3BIT_BINARY_WEIGHTED(config, "dac", 0).add_route(ALL_OUTPUTS, "speaker", 0.5); + voltage_regulator_device &vref(VOLTAGE_REGULATOR(config, "vref")); + vref.add_route(0, "dac", 1.0, DAC_VREF_POS_INPUT); vref.add_route(0, "dac", -1.0, DAC_VREF_NEG_INPUT); } ROM_START(itt1700) |