Apple II character set
Apple II text mode uses the 7-bit ASCII character set. The high-bit is set to display in normal mode on the 40x24 text screen.
Character sets
Apple II / Apple II plus
The original Signetics 2513 character generator chip has 64 glyphs for upper case, numbers, symbols, and punctuation characters. Each 5x7 pixel bitmap matrix is displayed in a 7x8 character cell on the text screen. The 64 characters can be displayed in INVERSE in the range $00 to $3F, FLASHing in the range $40 to $7F, and NORMAL mode in the range $80 to $FF. Normal mode characters are repeated in the $80 to $FF range.To display lowercase letters, applications can run in the graphics modes and use custom fonts, rather than running in text mode using the font in ROM.