65C02 running at 1.023 MHz 8-bit data bus Memory 64 KB RAM built-in 16 KB ROM built-in Expandable from 64 KB up to 1 MB RAM or more Video modes 40 and 80 columns text, white-on-black, with 24 lines Low-Resolution: 40×48 (16 colors) High-Resolution: 280×192 (6 colors) Double-Low-Resolution: 80×48 (16 colors) Double-High-Resolution: 560×192 (16 colors) Audio Built-in speaker; 1-bit toggling Built-in cassette recorder interface; 1-bit toggle output, 1-bit zero-crossing input Expansion Seven Apple II Bus slots (50-pin card-edge) Auxiliary slot (60-pin card-edge) Internal connectors Game I/O socket (16-pin DIP) RF modulation output (4-pin Molex) Numeric keypad (11-pin Molex) External connectors NTSC composite video output (RCA connector) Cassette in/out (two -inch mono phono jacks) Joystick (DE-9) Notes Revisions In production from January 1983 to November 1993, the Apple IIe remained relatively unchanged through the years. However, there was one significant motherboard update, a major firmware update and two cosmetically revised machines. These revisions are detailed below. Revision A motherboard At the time of the Apple IIe's introduction, and well into the first few months of production, this motherboard shipped with all units. Graphics modes supported are identical to, and limited to, those of the Apple II Plus before it (Double-Low/Double-High resolution is not supported). This revision logic board is also incompatible with a small number of newer plug-in expansion slot cards. Under a free service upgrade program, Apple advised owners of the revision A to have authorized dealers replace it with the revision B motherboard. Revision B motherboard Shortly after the "Revision A" motherboard's release in 1983, engineers discovered that the bank-switching feature (which used a paralleled 64 KB of RAM on the Extended 80-Column Card or 1 KB to produce 80 columns using bank-switching) could also be used to produce a new graphics mode, Double-High-Resolution, which doubles the horizontal resolution and increases the number of colors from the 6 of standard High-Resolution to 16. In order to support this, some modifications had to be made to the motherboard, which became the Revision B. In addition to supporting Double-High-Resolution and a rarely used Double-Low-Resolution mode (see specifications above) it also added a special video signal accessible in slot 7. Apple upgraded the motherboard free of charge. In later years Apple labeled newer IIe motherboards with a "-A" suffix once again, although in terms of functionality they were Revision B motherboards. New case and keyboard In 1984, Apple revised the case and