The IIc (released April 24th, 1984) and IIc+ (released September 1988) are 'luggable' versions of an Enhanced IIe, with many built-in 'cards'. Included are 2 serial ports, a mouse port, a disk port and 128K of RAM. The IIc+ has a built-in accelerator that runs at either 1 or 4Mhz (switch built into case), an internal power supply vs. the 'brick on a rope' design of the IIc, and a built in 800K 3.5" drive vs. the 140K 5.25" drive of the IIc.

Even though they don't have slots, you can still add extra memory (there's room under the keyboard) and a hard drive (through the disk port--a bit slow by ordinary standards, but usable. (Hard to find though-- was made by Chinook, but Sequential Systems later bought out the design). The IIc and IIc+ run just about everything that an Enhanced IIe runs. The IIc and IIc+ cannot connect to an AppleTalk network.

The IIc had a number of internal revisions; the best way to check is to go into Basic and type "PRINT PEEK (64447)" and press return (no quotes). If it says 255, you have a very old IIc; most of those motherboards had problems that prevented most IIcs from getting reliable serial communications on faster than somewhere in the 300-2400 baud ranges.

See your dealer about getting an upgrade, which is apparently no longer free (tell them that the Apple authorization number is ODL660, and try anyhow). If it says 0, you can connect a 3.5" drive, but you don't have the internal memory expansion connector. If it says 3, you have the internal memory expansion connector-- extra RAM can be added with certain cards. If it says 4, you have the latest model of the IIc. If it says 5, you have a IIc+.

Various companies sell cables for the Apple IIc's more oddball 5-pin serial ports; check out Atlaz Computer Supply (516-239-1854) or LYBEN Computer Systems at (800) 493-5777. The IIc+ uses the 8 pin mini DIN-8 ports found on the GS and Macs past the Mac Plus, so cables for those other computers will work on them.

The IIc+ normally boots at high (4Mhz) speed, but if you hold down the 'escape' key on boot/reboot, it'll drop down to normal speed until the next reboot.

Information Courtesy of the Apple FAQ, Part II