68k:Ports:600012
From WikiTI
- Bits 13-8: LCD logical width = (64-n)*2 bytes ((64-n)*16 pixels)
- Bits 7-0: LCD logical height = (256-n)
If the LCD logical height is less, the screen will appear darker, because each line is visited more often.
This port can be written to one byte at a time without disturbing the other byte.