 The 600XL was essentially the Liz NY model, and the spiritual replacement for the 400, while the 800XL would replace both the 800 and 1200XL.The machines looked similar to the 1200XL, but were smaller back to front, the 600 being somewhat smaller as it lacked one row of memory chips on the PCB.The high-end 1400XL added a built-in 300 baud modem and a voice synthesizer, and the 1450XLD also included a built-in double-sided floppy disk drive in an enlarged case, with a slot for a second drive.