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diff --git a/docs/release/src/frontend/mame/ui/about.cpp b/docs/release/src/frontend/mame/ui/about.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Vas Crabb
+/***************************************************************************
+
+ ui/about.cpp
+
+ About box
+
+***************************************************************************/
+
+#include "emu.h"
+#include "ui/about.h"
+
+#include "ui/ui.h"
+#include "ui/utils.h"
+
+#include "mame.h"
+
+#include <string_view>
+
+
+namespace ui {
+
+namespace {
+
+#include "copying.ipp"
+
+} // anonymous namespace
+
+
+/**************************************************
+ ABOUT BOX
+**************************************************/
+
+
+//-------------------------------------------------
+// ctor
+//-------------------------------------------------
+
+menu_about::menu_about(mame_ui_manager &mui, render_container &container)
+ : menu(mui, container)
+ , m_header{
+ util::string_format(
+#ifdef MAME_DEBUG
+ _("%1$s %2$s (%3$s%4$sP%5$s, debug)"),
+#else
+ _("%1$s %2$s (%3$s%4$sP%5$s)"),
+#endif
+ emulator_info::get_appname(),
+ bare_build_version,
+ (sizeof(int) == sizeof(void *)) ? "I" : "",
+ (sizeof(long) == sizeof(void *)) ? "L" : (sizeof(long long) == sizeof(void *)) ? "LL" : "",
+ sizeof(void *) * 8),
+ /*util::string_format(_("Revision: %1$s"), bare_vcs_revision)*/" " } // MESSUI
+{
+}
+
+
+//-------------------------------------------------
+// dtor
+//-------------------------------------------------
+
+menu_about::~menu_about()
+{
+}
+
+
+//-------------------------------------------------
+// perform our special rendering
+//-------------------------------------------------
+
+void menu_about::custom_render(void *selectedref, float top, float bottom, float origx1, float origy1, float origx2, float origy2)
+{
+ // draw the title
+ draw_text_box(
+ std::begin(m_header), std::end(m_header),
+ origx1, origx2, origy1 - top, origy1 - ui().box_tb_border(),
+ text_layout::text_justify::CENTER, text_layout::word_wrapping::TRUNCATE, false,
+ ui().colors().text_color(), UI_GREEN_COLOR, 1.0f);
+}
+
+
+//-------------------------------------------------
+// draw - draw about
+//-------------------------------------------------
+
+void menu_about::draw(uint32_t flags)
+{
+ rgb_t const color = ui().colors().text_color();
+ float const aspect = machine().render().ui_aspect(&container());
+ float const line_height = ui().get_line_height();
+ float const ud_arrow_width = line_height * aspect;
+ float const gutter_width = 0.52f * line_height * aspect;
+ float const visible_width = 1.0f - (2.0f * ui().box_lr_border() * aspect);
+ float const visible_left = (1.0f - visible_width) * 0.5f;
+ float const extra_height = 2.0f * line_height;
+ float const visible_extra_menu_height = get_customtop() + get_custombottom() + extra_height;
+
+ // determine effective positions taking into account the hilighting arrows
+ float const maximum_width = visible_width - 2.0f * gutter_width;
+
+ draw_background();
+ map_mouse();
+
+ // account for extra space at the top and bottom
+ float visible_main_menu_height = 1.0f - 2.0f * ui().box_tb_border() - visible_extra_menu_height;
+ m_visible_lines = int(std::trunc(visible_main_menu_height / line_height));
+ visible_main_menu_height = float(m_visible_lines) * line_height;
+
+ // compute top/left of inner menu area by centering, if the menu is at the bottom of the extra, adjust
+ float const visible_top = ((1.0f - (visible_main_menu_height + visible_extra_menu_height)) * 0.5f) + get_customtop();
+
+ // lay out the text if necessary
+ if (!m_layout || (m_layout->width() != maximum_width))
+ {
+ m_layout.emplace(ui().create_layout(container(), maximum_width));
+ for (char const *const *line = copying_text; *line; ++line)
+ {
+ m_layout->add_text(*line, color);
+ m_layout->add_text("\n", color);
+ }
+ }
+ float const actual_width = m_layout->actual_width();
+
+ // compute text box size
+ float const x1 = visible_left + ((maximum_width - actual_width) * 0.5f);
+ float const y1 = visible_top - ui().box_tb_border();
+ float const x2 = visible_left + visible_width - ((maximum_width - actual_width) * 0.5f);
+ float const y2 = visible_top + visible_main_menu_height + ui().box_tb_border() + extra_height;
+ float const effective_left = x1 + gutter_width;
+ float const line_x0 = x1 + 0.5f * UI_LINE_WIDTH;
+ float const line_x1 = x2 - 0.5f * UI_LINE_WIDTH;
+ float const separator = visible_top + float(m_visible_lines) * line_height;
+
+ ui().draw_outlined_box(container(), x1, y1, x2, y2, ui().colors().background_color());
+
+ int const visible_items = m_layout->lines();
+ m_visible_lines = (std::min)(visible_items, m_visible_lines);
+ top_line = (std::max)(0, top_line);
+ if (top_line + m_visible_lines >= visible_items)
+ top_line = visible_items - m_visible_lines;
+
+ clear_hover();
+ if (top_line)
+ {
+ // if we're on the top line, display the up arrow
+ rgb_t fgcolor = ui().colors().text_color();
+ if (mouse_in_rect(line_x0, visible_top, line_x1, visible_top + line_height))
+ {
+ fgcolor = ui().colors().mouseover_color();
+ highlight(
+ line_x0, visible_top,
+ line_x1, visible_top + line_height,
+ ui().colors().mouseover_bg_color());
+ set_hover(HOVER_ARROW_UP);
+ }
+ draw_arrow(
+ 0.5f * (x1 + x2) - 0.5f * ud_arrow_width, visible_top + 0.25f * line_height,
+ 0.5f * (x1 + x2) + 0.5f * ud_arrow_width, visible_top + 0.75f * line_height,
+ fgcolor, ROT0);
+ }
+ if ((top_line + m_visible_lines) < visible_items)
+ {
+ // if we're on the bottom line, display the down arrow
+ float const line_y = visible_top + float(m_visible_lines - 1) * line_height;
+ rgb_t fgcolor = ui().colors().text_color();
+ if (mouse_in_rect(line_x0, line_y, line_x1, line_y + line_height))
+ {
+ fgcolor = ui().colors().mouseover_color();
+ highlight(
+ line_x0, line_y,
+ line_x1, line_y + line_height,
+ ui().colors().mouseover_bg_color());
+ set_hover(HOVER_ARROW_DOWN);
+ }
+ draw_arrow(
+ 0.5f * (x1 + x2) - 0.5f * ud_arrow_width, line_y + 0.25f * line_height,
+ 0.5f * (x1 + x2) + 0.5f * ud_arrow_width, line_y + 0.75f * line_height,
+ fgcolor, ROT0 ^ ORIENTATION_FLIP_Y);
+ }
+
+ // return the number of visible lines, minus 1 for top arrow and 1 for bottom arrow
+ m_visible_items = m_visible_lines - (top_line ? 1 : 0) - (top_line + m_visible_lines != visible_items);
+ m_layout->emit(
+ container(),
+ top_line ? (top_line + 1) : 0, m_visible_items,
+ effective_left, visible_top + (top_line ? line_height : 0.0f));
+
+ // add visual separator before the "return to prevous menu" item
+ container().add_line(
+ x1, separator + (0.5f * line_height),
+ x2, separator + (0.5f * line_height),
+ UI_LINE_WIDTH, ui().colors().text_color(), PRIMFLAG_BLENDMODE(BLENDMODE_ALPHA));
+
+ menu_item const &pitem = item(0);
+ std::string_view const itemtext = pitem.text;
+ float const line_y0 = separator + line_height;
+ float const line_y1 = line_y0 + line_height;
+
+ if (mouse_in_rect(line_x0, line_y0, line_x1, line_y1) && is_selectable(pitem))
+ set_hover(0);
+
+ highlight(line_x0, line_y0, line_x1, line_y1, ui().colors().selected_bg_color());
+ ui().draw_text_full(
+ container(), itemtext,
+ effective_left, line_y0, actual_width,
+ text_layout::text_justify::CENTER, text_layout::word_wrapping::TRUNCATE,
+ mame_ui_manager::NORMAL,
+ ui().colors().selected_color(), ui().colors().selected_bg_color(),
+ nullptr, nullptr);
+
+ // if there is something special to add, do it by calling the virtual method
+ custom_render(get_selection_ref(), get_customtop(), get_custombottom(), x1, y1, x2, y2);
+}
+
+
+//-------------------------------------------------
+// populate - populates the about modal
+//-------------------------------------------------
+
+void menu_about::populate(float &customtop, float &custombottom)
+{
+ // make space for the title and revision
+ customtop = (ui().get_line_height() * m_header.size()) + (ui().box_tb_border() * 3.0f);
+}
+
+
+//-------------------------------------------------
+// handle - manages inputs in the about modal
+//-------------------------------------------------
+
+void menu_about::handle()
+{
+ const event *event = process(PROCESS_CUSTOM_NAV);
+ if (event)
+ {
+ switch (event->iptkey)
+ {
+ case IPT_UI_UP:
+ --top_line;
+ break;
+
+ case IPT_UI_DOWN:
+ ++top_line;
+ break;
+
+ case IPT_UI_PAGE_UP:
+ top_line -= m_visible_lines - 3;
+ break;
+
+ case IPT_UI_PAGE_DOWN:
+ top_line += m_visible_lines - 3;
+ break;
+
+ case IPT_UI_HOME:
+ top_line = 0;
+ break;
+
+ case IPT_UI_END:
+ top_line = m_layout->lines() - m_visible_lines;
+ break;
+ }
+ }
+}
+
+};