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qvt190: basic text rendering

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This commit is contained in:
Dirk Best 2019-06-17 16:05:58 +02:00
parent ff80ed83ef
commit 97de703617
1 changed files with 21 additions and 5 deletions
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26
src/mame/drivers/qvt190.cpp
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@ -32,6 +32,7 @@ public:
qvt190_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_palette(*this, "palette")
, m_p_chargen(*this, "chargen")
, m_videoram(*this, "videoram")
{ }
@ -44,12 +45,27 @@ private:
void qvt190_mem_map(address_map &map);
required_device<cpu_device> m_maincpu;
required_device<palette_device> m_palette;
required_region_ptr<u8> m_p_chargen;
required_shared_ptr<u8> m_videoram;
};
MC6845_UPDATE_ROW(qvt190_state::update_row)
{
const rgb_t *palette = m_palette->palette()->entry_list_raw();
for (int x = 0; x < x_count; x++)
{
uint16_t mem = (ma + x) & 0x7ff;
uint8_t chr = m_videoram[mem];
uint16_t gfx = m_p_chargen[(chr << 4) | ra];
if (x == cursor_x)
gfx = ~gfx;
for (int i = 0; i < 9; i++)
bitmap.pix32(y, x*9 + (8-i)) = palette[BIT(gfx, i) ? 2 : 0];
}
}
void qvt190_state::qvt190_mem_map(address_map &map)
@ -83,7 +99,7 @@ GFXDECODE_END
void qvt190_state::qvt190(machine_config &config)
{
M6800(config, m_maincpu, XTAL(16'669'800) / 9);
M6800(config, m_maincpu, 16.6698_MHz_XTAL / 9);
m_maincpu->set_addrmap(AS_PROGRAM, &qvt190_state::qvt190_mem_map);
NVRAM(config, "nvram", nvram_device::DEFAULT_ALL_0); // V61C16P55L + battery
@ -93,14 +109,14 @@ void qvt190_state::qvt190(machine_config &config)
ACIA6850(config, "acia2", 0);
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
screen.set_raw(XTAL(16'669'800), 882, 0, 720, 315, 0, 300);
screen.set_raw(16.6698_MHz_XTAL, 882, 18, 738, 315, 0, 300);
screen.set_screen_update("crtc", FUNC(mc6845_device::screen_update));
PALETTE(config, "palette", palette_device::MONOCHROME_HIGHLIGHT);
PALETTE(config, m_palette, palette_device::MONOCHROME_HIGHLIGHT);
GFXDECODE(config, "gfxdecode", "palette", chars);
GFXDECODE(config, "gfxdecode", m_palette, chars);
mc6845_device &crtc(MC6845(config, "crtc", XTAL(16'669'800) / 9));
mc6845_device &crtc(MC6845(config, "crtc", 16.6698_MHz_XTAL / 9));
crtc.set_screen("screen");
crtc.set_char_width(9);
crtc.set_update_row_callback(FUNC(qvt190_state::update_row), this);