* term/i386/pc/vga.c (VGA_HEIGHT): Changed to 350.
(PAGE_OFFSET): New macro.
(CRTC_ADDR_PORT): Likewise.
(CRTC_DATA_PORT): Likewise.
(START_ADDR_HIGH_REGISTER): Likewise.
(START_ADDR_LOW_REGISTER): Likewise.
(GRAPHICS_ADDR_PORT): Likewise.
(GRAPHICS_DATA_PORT): Likewise.
(READ_MAP_REGISTER): Likewise.
(INPUT_STATUS1_REGISTER): Likewise.
(INPUT_STATUS1_VERTR_BIT): Likewise.
(page): New variable.
(wait_vretrace): New function.
(set_read_map): Likewise.
(set_start_address): Likewise.
(grub_vga_init): Use mode 0x10 instead of mode 0x12. Switch to
the right page.
(check_vga_mem): Take the page into account.
(write_char): Likewise.
(write_cursor): Likewise.
(scroll_up): Likewise. Copy the page to the page that is not
shown and switch between both pages.
(grub_vga_putchar): Fix off by one error.
(grub_vga_cls): Wait for the vertical retrace. Take the page into
account.
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