I'm an avid collector of Atari computers, but I know very little about the Arabic language. If you know more about Arabic than I do, feel free to send me e-mail to correct any assumptions I've made. According to Draco 's excellent SysInfo system investigator and benchmark program, the Arabic unit has OS serial number BB 01.3B with an OS revision date of 21 July 1987. For comparison, my vanilla 65 XE has OS serial number BB 01.02 and a revision date of 10 May 1983. Here's a close-up of the keyboard.
Most keys show Arabic letters as well.
Function keys like help, start, select, option, reset, shift, and return are also labeled in Arabic. The computer has two character sets. Next is the same screen after switching character sets. This is default. The Arabic computer apparently uses the same ROM space to hold dual character sets.