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Lower Screen

The vertical screen is 800 pixels high causing 640 to be centered.
Some say it would be better to move screen down so we can see from bottom up.
Rexer Show on you tube made a video explaing this
Link here
rexer show
I tried lowering the scren the max 160 pixels to bottom and it is definitely worse not better.
Then I tried lowering it 80 pixels splitting the difference.
While this is OK I can't honestly say it's any better than centered.
So there is no way I am bothering making this adjustment for any thing more than directory override.
I might even undo it.

Retroarch Core Overrides

We can change display per core here. From Quick Menu -> Overrides -> Save Core Override. This will save Video setting per core. User for Vetrex to increase screen size.

Lowering the Display Screen

1. Press Left and Right Coin Doors to enter RA
2. Press P2 Start for Back Command
3. Select Settings
4. Select Video
5. Select Aspect Ratio
6. Select Custom
7. Hover on Custom Aspect Ratio (Y Position)
8. Push Joystick Right to increate Position
9. Was 80 Adjust to 160.
10. P2 Start for Back Command
11. P2 Start for Back Command
12. P2 Start for Back Command
13. Select Quick Menu
14. Select Overrides
15. Save Content Directory Overrides

RA Content Directory Override

1. \\DonkeyKong\configs\all\retroarch\config\FinalBurn Neo\fba.cfg
2. FinalBurn Neo is the name of the core
3. fba is the title of the directory
4. This means Content Directory Overrides are not directory location based.
5. Content Directory Overrides are directory title based.
6. Content Directory Overrides are directory title based.
7. This should only impact \\DonkeyKong\roms\am\fba

fba.cfg

custom_viewport_y = "160"

accessibility_narrator_speech_speed = "5" ai_service_mode = "1" ai_service_url = "http://localhost:4404/" aspect_ratio_index = "23" assets_directory = "~/.config/retroarch/assets" audio_driver = "alsathread" audio_enable = "true" audio_filter_dir = "~/.config/retroarch/filters/audio" audio_latency = "64" audio_max_timing_skew = "0.050000" audio_out_rate = "48000" audio_rate_control = "true" audio_resampler = "sinc" audio_resampler_quality = "2" audio_sync = "true" auto_overrides_enable = "true" auto_screenshot_filename = "true" auto_shaders_enable = "true" bluetooth_driver = "null" builtin_imageviewer_enable = "true" builtin_mediaplayer_enable = "true" camera_driver = "null" cheat_database_path = "~/.config/retroarch/cheats" cheevos_appearance_padding_auto = "true" cheevos_challenge_indicators = "true" cheevos_hardcore_mode_enable = "true" cheevos_leaderboards_enable = "true" cheevos_richpresence_enable = "true" cheevos_verbose_enable = "true" cheevos_visibility_account = "true" cheevos_visibility_mastery = "true" cheevos_visibility_summary = "1" cheevos_visibility_unlock = "true" content_database_path = "~/.config/retroarch/database/rdb" content_favorites_size = "200" content_history_size = "200" content_runtime_log = "true" content_show_add = "true" content_show_add_entry = "2" content_show_contentless_cores = "2" content_show_explore = "true" content_show_favorites = "true" content_show_history = "true" content_show_images = "true" content_show_netplay = "true" content_show_playlists = "true" content_show_settings = "true" content_show_video = "true" core_assets_directory = "~/.config/retroarch/downloads" core_info_cache_enable = "true" core_option_category_enable = "true" core_set_supports_no_game_enable = "true" core_updater_auto_backup_history_size = "1" core_updater_auto_extract_archive = "true" core_updater_buildbot_assets_url = "http://buildbot.libretro.com/assets/" core_updater_buildbot_cores_url = "http://buildbot.libretro.com/nightly/linux/armhf/latest/" crt_switch_resolution_super = "2560" crt_video_refresh_rate = "60.000000" custom_viewport_height = "640" custom_viewport_width = "480" custom_viewport_y = "160" desktop_menu_enable = "true" discord_app_id = "475456035851599874" driver_switch_enable = "true" fastforward_frameskip = "true" fps_update_interval = "256" frontend_log_level = "1" game_specific_options = "true" history_list_enable = "true" input_analog_sensitivity = "1.000000" input_axis_threshold = "0.500000" input_bind_hold = "2" input_bind_timeout = "5" input_descriptor_label_show = "true" input_driver = "udev" input_duty_cycle = "3" input_hotkey_block_delay = "5" input_max_users = "5" input_overlay_abxy_diagonal_sensitivity = "50" input_overlay_dpad_diagonal_sensitivity = "80" input_overlay_enable = "true" input_overlay_enable_autopreferred = "true" input_overlay_hide_in_menu = "true" input_overlay_opacity = "0.700000" input_overlay_scale_landscape = "1.000000" input_overlay_scale_portrait = "1.000000" input_overlay_show_inputs = "2" input_overlay_show_mouse_cursor = "true" input_player10_joypad_index = "9" input_player10_mouse_index = "9" input_player11_joypad_index = "10" input_player11_mouse_index = "10" input_player12_joypad_index = "11" input_player12_mouse_index = "11" input_player13_joypad_index = "12" input_player13_mouse_index = "12" input_player14_joypad_index = "13" input_player14_mouse_index = "13" input_player15_joypad_index = "14" input_player15_mouse_index = "14" input_player16_joypad_index = "15" input_player16_mouse_index = "15" input_player2_joypad_index = "1" input_player2_mouse_index = "1" input_player3_joypad_index = "2" input_player3_mouse_index = "2" input_player4_joypad_index = "3" input_player4_mouse_index = "3" input_player5_joypad_index = "4" input_player5_mouse_index = "4" input_player6_joypad_index = "5" input_player6_mouse_index = "5" input_player7_joypad_index = "6" input_player7_mouse_index = "6" input_player8_joypad_index = "7" input_player8_mouse_index = "7" input_player9_joypad_index = "8" input_player9_mouse_index = "8" input_poll_type_behavior = "2" input_remap_binds_enable = "true" input_rumble_gain = "100" input_sensors_enable = "true" input_touch_scale = "1" input_turbo_period = "6" joypad_autoconfig_dir = "~/.config/retroarch/autoconfig" keyboard_gamepad_enable = "true" keyboard_gamepad_mapping_type = "1" led_driver = "null" libretro_info_path = "~/.config/retroarch/cores" libretro_log_level = "1" load_dummy_on_core_shutdown = "true" location_driver = "null" log_dir = "~/.config/retroarch/logs" materialui_auto_rotate_nav_bar = "true" materialui_dual_thumbnail_list_view_enable = "true" materialui_icons_enable = "true" materialui_landscape_layout_optimization = "1" materialui_menu_color_theme = "9" materialui_playlist_icons_enable = "true" materialui_show_nav_bar = "true" materialui_switch_icons = "true" materialui_thumbnail_background_enable = "true" materialui_thumbnail_view_landscape = "2" materialui_thumbnail_view_portrait = "1" memory_update_interval = "256" menu_battery_level_enable = "true" menu_core_enable = "true" menu_dynamic_wallpaper_enable = "true" menu_enable_widgets = "true" menu_font_color_blue = "255" menu_font_color_green = "255" menu_font_color_red = "255" menu_footer_opacity = "1.000000" menu_framebuffer_opacity = "0.900000" menu_header_opacity = "1.000000" menu_horizontal_animation = "true" menu_insert_disk_resume = "true" menu_mouse_enable = "true" menu_navigation_browser_filter_supported_extensions_enable = "true" menu_navigation_wraparound_enable = "true" menu_pause_libretro = "true" menu_remember_selection = "1" menu_rgui_full_width_layout = "true" menu_rgui_transparency = "true" menu_savestate_resume = "true" menu_scale_factor = "1.000000" menu_screensaver_animation_speed = "1.000000" menu_scroll_delay = "256" menu_shader_pipeline = "1" menu_show_advanced_settings = "true" menu_show_configurations = "true" menu_show_dump_disc = "true" menu_show_help = "true" menu_show_information = "true" menu_show_latency = "true" menu_show_load_content = "true" menu_show_load_core = "true" menu_show_load_disc = "true" menu_show_overlays = "true" menu_show_quit_retroarch = "true" menu_show_reboot = "true" menu_show_rewind = "true" menu_show_shutdown = "true" menu_show_sublabels = "true" menu_throttle_framerate = "true" menu_thumbnails = "3" menu_ticker_smooth = "true" menu_ticker_speed = "2.000000" menu_ticker_type = "1" menu_timedate_enable = "true" menu_timedate_style = "11" menu_wallpaper_opacity = "0.300000" menu_widget_scale_auto = "true" menu_widget_scale_factor = "1.000000" menu_widget_scale_factor_windowed = "1.000000" menu_xmb_show_title_header = "true" menu_xmb_thumbnail_scale_factor = "100" menu_xmb_title_margin = "5" menu_xmb_vertical_fade_factor = "100" midi_driver = "alsa" midi_input = "OFF" midi_output = "OFF" midi_volume = "100" netplay_allow_slaves = "true" netplay_chat_color_msg = "16777215" netplay_chat_color_name = "32768" netplay_check_frames = "600" netplay_fade_chat = "true" netplay_ip_port = "55435" netplay_max_connections = "3" netplay_mitm_server = "nyc" netplay_nat_traversal = "true" netplay_public_announce = "true" netplay_show_only_connectable = "true" netplay_show_passworded = "true" network_cmd_port = "55355" network_remote_base_port = "55400" notification_show_autoconfig = "true" notification_show_cheats_applied = "true" notification_show_config_override_load = "true" notification_show_fast_forward = "true" notification_show_patch_applied = "true" notification_show_refresh_rate = "true" notification_show_remap_load = "true" notification_show_screenshot = "true" notification_show_set_initial_disk = "true" overlay_directory = "~/.config/retroarch/overlay" ozone_menu_color_theme = "1" ozone_thumbnail_scale_factor = "1.000000" ozone_truncate_playlist_name = "true" pause_nonactive = "true" playlist_directory = "~/.config/retroarch/playlists" playlist_entry_remove_enable = "1" playlist_entry_rename = "true" playlist_show_entry_idx = "true" playlist_show_sublabels = "true" playlist_sort_alphabetical = "true" quick_menu_show_add_to_favorites = "true" quick_menu_show_cheats = "true" quick_menu_show_close_content = "true" quick_menu_show_controls = "true" quick_menu_show_download_thumbnails = "true" quick_menu_show_information = "true" quick_menu_show_options = "true" quick_menu_show_replay = "true" quick_menu_show_reset_core_association = "true" quick_menu_show_restart_content = "true" quick_menu_show_resume_content = "true" quick_menu_show_save_content_dir_overrides = "true" quick_menu_show_save_core_overrides = "true" quick_menu_show_save_game_overrides = "true" quick_menu_show_save_load_state = "true" quick_menu_show_set_core_association = "true" quick_menu_show_shaders = "true" quick_menu_show_start_recording = "true" quick_menu_show_start_streaming = "true" quick_menu_show_take_screenshot = "true" quick_menu_show_undo_save_load_state = "true" record_driver = "ffmpeg" replay_auto_index = "true" rewind_buffer_size_step = "10" rgui_background_filler_thickness_enable = "true" rgui_border_filler_enable = "true" rgui_border_filler_thickness_enable = "true" rgui_config_directory = "~/.config/retroarch/config" rgui_menu_color_theme = "4" rgui_particle_effect_screensaver = "true" rgui_particle_effect_speed = "1.000000" run_ahead_frames = "1" run_ahead_secondary_instance = "true" savestate_file_compression = "true" screen_brightness = "100" screenshot_directory = "~/.config/retroarch/screenshots" settings_show_accessibility = "true" settings_show_achievements = "true" settings_show_ai_service = "true" settings_show_audio = "true" settings_show_configuration = "true" settings_show_core = "true" settings_show_directory = "true" settings_show_drivers = "true" settings_show_file_browser = "true" settings_show_frame_throttle = "true" settings_show_input = "true" settings_show_latency = "true" settings_show_logging = "true" settings_show_network = "true" settings_show_onscreen_display = "true" settings_show_playlists = "true" settings_show_power_management = "true" settings_show_recording = "true" settings_show_saving = "true" settings_show_user = "true" settings_show_user_interface = "true" settings_show_video = "true" slowmotion_ratio = "3.000000" suspend_screensaver_enable = "true" threaded_data_runloop_enable = "true" thumbnails_directory = "~/.config/retroarch/thumbnails" ui_companion_start_on_boot = "true" ui_menubar_enable = "true" video_allow_rotate = "true" video_aspect_ratio = "1.333300" video_crop_overscan = "true" video_driver = "gl" video_filter_dir = "~/.config/retroarch/filters/video" video_font_enable = "true" video_force_aspect = "true" video_hdr_display_contrast = "5.000000" video_hdr_expand_gamut = "true" video_hdr_max_nits = "1000.000000" video_hdr_paper_white_nits = "200.000000" video_max_frame_latency = "1" video_max_swapchain_images = "3" video_message_pos_x = "0.050000" video_message_pos_y = "0.050000" video_msg_bgcolor_opacity = "1.000000" video_record_quality = "2" video_record_scale_factor = "1" video_record_threads = "2" video_refresh_rate = "60.000000" video_scale = "3" video_shader_dir = "~/.config/retroarch/shaders" video_shader_preset_save_reference_enable = "true" video_stream_port = "56400" video_stream_quality = "11" video_stream_scale_factor = "1" video_swap_interval = "1" video_vsync = "true" video_waitable_swapchains = "true" video_window_auto_height_max = "1080" video_window_auto_width_max = "1920" video_window_opacity = "100" video_window_show_decorations = "true" video_windowed_fullscreen = "true" video_windowed_position_height = "720" video_windowed_position_width = "1280" wifi_driver = "null" wifi_enabled = "true" xmb_alpha_factor = "75" xmb_menu_color_theme = "4" xmb_switch_icons = "true"