[0xe2-0x9a-0x9b]

The "8x1 mode" and border effects do work in GoSpeccy. You can try the Overscan demo (http://www.worldofspectrum.org/infoseekid.cgi?id=0007636).

GoSpeccy does not support any 384 line mode. As far as I know, the horizontal resolution is 256 pixels, so doubling that would yield 512 horizontal pixels.