I can talk more about memory than cost. These machines had 4K, 8K, and 16K memory cards. (See: http://www.cs.virginia.edu/brochure/museum.html) There used to be classic 3 board computers, CPU card, memory card, and an I/O card. The memory card might have 1K or 4K on it. Eventually the I/O card added floppy controllers and serial ports, and then it became practical to have something like an operating system (CP/M-80) and a programming language (BASIC). dsc --------------------------------------------------------------------- To unsubscribe, e-mail: tclug-list-unsubscribe at mn-linux.org For additional commands, e-mail: tclug-list-help at mn-linux.org