( Current Y position on the LCD, that is, where we're going to
  spit our next glyph. )
: LCD_CURY 0 TI_MEM+ ;
: LCD_CURX 1 TI_MEM+ ;
( two pixel buffers that are 8 pixels wide (1b) by FNT_HEIGHT
  pixels high. This is where we compose our resulting pixels
  blocks when spitting a glyph. )
: LCD_BUF 2 TI_MEM+ ;