Apple II: The first Apple II’s, Serial numbers start with A2S1.
Apple II plus: Somewhere around REV 4. Apple made the AppleSoft ROM set available and a new badge on the machine. Serial Numbers start with A2S2 now
Bell and Howell: A licensed Apple II with Black Case: Early models still had the raised Power light on the keyboard. Serial Numbers A2S3:
Apple ][e: This is the unenhanced ][e. The keyboard had a change from white text (early models) to dark text in this time
Apple //c: All in one slotless Apple II, Most common peripherals were built in.
Apple //e: Enhanced //e: New ROM added better diagnostics inbuilt and mouse text in the character ROM.
Apple //e platinum: This is an enhanced //e, cost reduced and with the numeric key-pad built in.
Apple IIgs: (Cortland) – The Graphics and Sound machine – Speed limited 16 bit machine.
Apple //c plus: The last apple // computer. Like the original //c but with 2.5Mhz clock to start and 3.5 drive as the boot drive.
//e card: This card plugged into PDS slot mac’s to give them apple ][ software compatibility. Allowed ProDOS partitions on the Mac hard drive and had a cable to attach Apple II DB19 floppies and a 9pin mouse/joystick.