Support for Japanese display on DOS/V systems.
(screen_old_address, screen_virtual_segment, screen_virtual_offset): New variables. (dosv_refresh_virtual_screen): New function. (dos_direct_output, dos_set_window_size, IT_write_glyphs, IT_clear_end_of_line, IT_clear_screen, IT_display_cursor, IT_reset_terminal_modes, XMenuActivate, abort): Call dosv_refresh_virtual_screen if under DOS/V. (IT_set_terminal_modes): If under DOS/V, update the address of primary screen buffer. (internal_terminal_init): Zero out screen_old_address, in case Emacs was dumped under DOS/V. (dos_get_saved_screen): Return failure indication if no screen was saved.
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