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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************
Control Universal Teletext Video Interface card
**********************************************************************/
#include "emu.h"
#include "teletext.h"
#include "bus/centronics/ctronics.h"
#include "machine/6522via.h"
#include "sound/beep.h"
#include "video/mc6845.h"
#include "video/saa5050.h"
#include "emupal.h"
#include "screen.h"
#include "speaker.h"
namespace {
class cu_teletext_device : public device_t, public device_acorn_bus_interface
{
public:
cu_teletext_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, CU_TELETEXT, tag, owner, clock)
, device_acorn_bus_interface(mconfig, *this)
, m_videoram(*this, "videoram", 0x400, ENDIANNESS_LITTLE)
, m_crtc(*this, "mc6845")
, m_trom(*this, "saa5050")
, m_via(*this, "via6522")
, m_option(*this, "OPTION")
, m_beeper(*this, "beeper")
{
}
protected:
// device_t overrides
virtual void device_start() override ATTR_COLD;
virtual void device_reset() override ATTR_COLD;
// optional information overrides
virtual ioport_constructor device_input_ports() const override ATTR_COLD;
virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
private:
memory_share_creator<uint8_t> m_videoram;
required_device<mc6845_device> m_crtc;
required_device<saa5050_device> m_trom;
required_device<via6522_device> m_via;
required_ioport m_option;
required_device<beep_device> m_beeper;
MC6845_UPDATE_ROW(crtc_update_row);
void vsync_changed(int state);
void de_changed(int state);
void irq_w(int state)
{
m_bus->irq_w(state);
}
};
//-------------------------------------------------
// input_ports - device-specific input ports
//-------------------------------------------------
static INPUT_PORTS_START(cu_teletext)
PORT_START("OPTION")
PORT_CONFNAME(0x01, 0x00, "Buzzer fitted")
PORT_CONFSETTING(0x00, DEF_STR(No))
PORT_CONFSETTING(0x01, DEF_STR(Yes))
INPUT_PORTS_END
ioport_constructor cu_teletext_device::device_input_ports() const
{
return INPUT_PORTS_NAME(cu_teletext);
}
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void cu_teletext_device::device_add_mconfig(machine_config &config)
{
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
screen.set_raw(12_MHz_XTAL, 768, 132, 612, 312, 20, 270);
screen.set_screen_update("mc6845", FUNC(mc6845_device::screen_update));
PALETTE(config, "palette").set_entries(8);
HD6845S(config, m_crtc, 6_MHz_XTAL / 3);
m_crtc->set_screen("screen");
m_crtc->set_show_border_area(false);
m_crtc->set_char_width(12);
m_crtc->out_vsync_callback().set(FUNC(cu_teletext_device::vsync_changed));
m_crtc->out_de_callback().set(FUNC(cu_teletext_device::de_changed));
m_crtc->set_update_row_callback(FUNC(cu_teletext_device::crtc_update_row));
SAA5050(config, m_trom, 6_MHz_XTAL);
MOS6522(config, m_via, DERIVED_CLOCK(1, 1));
m_via->writepa_handler().set("cent_data_out", FUNC(output_latch_device::write));
m_via->writepb_handler().set([this](uint8_t data) { m_beeper->set_state(m_option->read() ? BIT(data, 7) : 0); });
m_via->ca2_handler().set("centronics", FUNC(centronics_device::write_strobe));
m_via->irq_handler().set(FUNC(cu_teletext_device::irq_w));
centronics_device ¢ronics(CENTRONICS(config, "centronics", centronics_devices, "printer"));
centronics.ack_handler().set(m_via, FUNC(via6522_device::write_ca1));
centronics.busy_handler().set(m_via, FUNC(via6522_device::write_pb6));
output_latch_device &latch(OUTPUT_LATCH(config, "cent_data_out"));
centronics.set_output_latch(latch);
SPEAKER(config, "mono").front_center();
BEEP(config, m_beeper, 300).add_route(ALL_OUTPUTS, "mono", 0.5); // TODO: unknown frequency
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void cu_teletext_device::device_start()
{
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void cu_teletext_device::device_reset()
{
address_space &space = m_bus->memspace();
space.install_ram(0xd400, 0xd7ff, m_videoram);
space.install_readwrite_handler(0xd800, 0xd800, emu::rw_delegate(*m_crtc, FUNC(mc6845_device::status_r)), emu::rw_delegate(*m_crtc, FUNC(mc6845_device::address_w)));
space.install_readwrite_handler(0xd801, 0xd801, emu::rw_delegate(*m_crtc, FUNC(mc6845_device::register_r)), emu::rw_delegate(*m_crtc, FUNC(mc6845_device::register_w)));
space.install_device(0xd900, 0xd90f, *m_via, &via6522_device::map);
//m_beeper->set_state(0);
}
//**************************************************************************
// IMPLEMENTATION
//**************************************************************************
MC6845_UPDATE_ROW(cu_teletext_device::crtc_update_row)
{
uint32_t *p = &bitmap.pix(y);
m_trom->lose_w(1);
m_trom->lose_w(0);
for (int column = 0; column < x_count; column++)
{
m_trom->write(m_videoram[(ma + column) & 0x3ff]);
m_trom->f1_w(1);
m_trom->f1_w(0);
for (int bit = 0; bit < 12; bit++)
{
m_trom->tr6_w(1);
m_trom->tr6_w(0);
int col = m_trom->get_rgb() ^ ((column == cursor_x) ? 7 : 0);
int r = BIT(col, 0) * 0xff;
int g = BIT(col, 1) * 0xff;
int b = BIT(col, 2) * 0xff;
*p++ = rgb_t(r, g, b);
}
}
}
void cu_teletext_device::vsync_changed(int state)
{
m_trom->dew_w(state);
m_via->write_cb1(state);
}
void cu_teletext_device::de_changed(int state)
{
m_via->write_cb2(state);
m_via->write_pb0(state);
}
} // anonymous namespace
DEFINE_DEVICE_TYPE_PRIVATE(CU_TELETEXT, device_acorn_bus_interface, cu_teletext_device, "cu_teletext", "Control Universal Teletext Video Interface card")
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