CHAR specifies the character set.
CHAR n[,I] 0<n<4
This will output double width text in inverse video if I>0.
In graphics mode only there are five different character sets, with CHAR 0 being the default set.
I is the inverse parameter. If it is zero then the characters are normal. If it is non zero then inverse video is displayed.
Each time character size is changed, the cursor is re-located to the upper left-hand coner.
CHAR has no effect in text mode.