Changes

'''0''' – PCWclassic monochrome: '''2 colors, 720x256'''.

'''1''' – Groups bits 2 by 2, giving '''4 colors; 360x256'''.

'''2''' – Same as 4-bit. '''16 colors, 180x256'''.

'''3''' – 8x1 attribute mode, as Timex/Thomson/MSX/... 8+8 bits are read, the first 8 are background and ink (4+4) and the next 8 are the bitmap. This allows for '''16 colors in 360x256''', at the cost of using only 2 different colors every 8x1 pixel. Due to the delay, the screen shifts one character to the right.

'''4''' – Experimental, unofficial: '''90x256''', with '''256 direct colors''' from the 8-bit palette. It therefore ignores the color palette. Enterprise-style, not particularly useful, but colorful.