Advanced Monitor Resolution

So recently I've been converting images to CC readable characters but the max resolution for my 8x6 monitors is 82x40 pixels. However, a redditor about a year ago posted this image of him with an 8x6 monitor display having 164x81 pixels http://i.imgur.com/1SZUD3V.png on the server he plays on. How can I get my 8x6 monitor display to be 164x81pixels instead of 82x40 pixels on the SMP server I play on?

in order to get more pixels on a monitor you must change the text scale, do note that this can only be changed for the whole screen, so do not expect that you can set one part high, and another part low.