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digilog320: Hook up CRTC, basic screen display

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This commit is contained in:
Dirk Best 2022-01-20 19:21:09 +01:00
parent ff210468d2
commit c60785f820
2 changed files with 45 additions and 4 deletions
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1
src/emu/xtal.cpp
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@ -124,6 +124,7 @@ const double XTAL::known_xtals[] = {
5'460'000, /* 5.46_MHz_XTAL ec1840 and ec1841 keyboard */
5'529'600, /* 5.5296_MHz_XTAL Kontron PSI98 keyboard */
5'626'000, /* 5.626_MHz_XTAL RCA CDP1869 PAL dot clock */
5'659'200, /* 5.6592_MHz_XTAL Digilog 320 dot clock */
5'670'000, /* 5.67_MHz_XTAL RCA CDP1869 NTSC dot clock */
5'714'300, /* 5.7143_MHz_XTAL Cidelsa Destroyer, TeleVideo serial keyboards */
5'856'000, /* 5.856_MHz_XTAL HP 3478A Multimeter */

48
src/mame/drivers/digilog320.cpp
View File

@ -47,6 +47,7 @@
#include "emu.h"
#include "cpu/i86/i186.h"
#include "cpu/z80/z80.h"
#include "machine/mc68681.h"
#include "video/mc6845.h"
#include "emupal.h"
#include "screen.h"
@ -65,7 +66,11 @@ public:
digilog320_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_subcpu(*this, "subcpu")
m_subcpu(*this, "subcpu"),
m_crtc(*this, "crtc"),
m_palette(*this, "palette"),
m_vram(*this, "vram"),
m_chargen(*this, "chargen")
{ }
void digilog320(machine_config &config);
@ -77,11 +82,17 @@ protected:
private:
required_device<i80186_cpu_device> m_maincpu;
required_device<z80_device> m_subcpu;
required_device<mc6845_device> m_crtc;
required_device<palette_device> m_palette;
required_shared_ptr<uint16_t> m_vram;
required_region_ptr<uint8_t> m_chargen;
void main_mem_map(address_map &map);
void main_io_map(address_map &map);
void sub_mem_map(address_map &map);
void sub_io_map(address_map &map);
MC6845_UPDATE_ROW(update_row);
};
@ -92,12 +103,15 @@ private:
void digilog320_state::main_mem_map(address_map &map)
{
map(0x00000, 0x1ffff).ram();
map(0x80000, 0x83fff).ram(); // vram
map(0x80000, 0x83fff).ram().share("vram");
map(0xa0000, 0xfffff).rom().region("maincpu", 0);
}
void digilog320_state::main_io_map(address_map &map)
{
map(0x080, 0x09f).rw("duart", FUNC(scn2681_device::read), FUNC(scn2681_device::write)).umask16(0x00ff);
map(0x180, 0x180).w(m_crtc, FUNC(mc6845_device::address_w));
map(0x182, 0x182).w(m_crtc, FUNC(mc6845_device::register_w));
}
void digilog320_state::sub_mem_map(address_map &map)
@ -116,6 +130,21 @@ void digilog320_state::sub_io_map(address_map &map)
// VIDEO EMULATION
//**************************************************************************
MC6845_UPDATE_ROW( digilog320_state::update_row )
{
pen_t const *const pen = m_palette->pens();
for (int x = 0; x < x_count; x++)
{
uint16_t const data = (m_vram[ma + x]);
uint8_t gfx = m_chargen[((data & 0xff) << 4) | ra];
// draw 8 pixels of the character
for (int i = 0; i < 8; i++)
bitmap.pix(y, x * 8 + i) = pen[BIT(gfx, i)];
}
}
static const gfx_layout char_layout =
{
8, 12,
@ -159,9 +188,20 @@ void digilog320_state::digilog320(machine_config &config)
m_subcpu->set_addrmap(AS_PROGRAM, &digilog320_state::sub_mem_map);
m_subcpu->set_addrmap(AS_IO, &digilog320_state::sub_io_map);
PALETTE(config, "palette", palette_device::MONOCHROME);
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
screen.set_raw(5.6592_MHz_XTAL, 320, 0, 256, 262, 0, 192);
screen.set_screen_update(m_crtc, FUNC(mc6845_device::screen_update));
GFXDECODE(config, "gfxdecode", "palette", chars);
PALETTE(config, m_palette, palette_device::MONOCHROME);
GFXDECODE(config, "gfxdecode", m_palette, chars);
MC6845(config, m_crtc, 5.6592_MHz_XTAL / 8); // HD46505SP-2
m_crtc->set_char_width(8);
m_crtc->set_show_border_area(false);
m_crtc->set_update_row_callback(FUNC(digilog320_state::update_row));
SCN2681(config, "duart", 3.6864_MHz_XTAL);
}