Xerox Corp yesterday added four more electronic typewriters to its product line. The Xerox MemoWriter is a compact electronic typewriter with a 40-character liquid crystal display and 15,000 character memory for about eight pages of text. It is the company’s first entry into the compact electronic typewriter market and costs $695. The Xerox 6030 Memorywriter is a high-end electronic typewriter with integrated 3.5 floppy drive for up to 350 pages of text per disk. Operators can also swap documents with other 6030’s memory and communicating Memorywriters. It is $2,595 from August. The Xerox 6018 Memorywriter is a mid-range machine with entry-level text editing. It has 15-character display and 32Kb of internal memory for 16 pages of text. By means of the display, users can edit information in the machine’s memory before it is printed. The 6018 Memorywriter is $1,045 and is set for the autumn. And the Xerox 6016 Memorywriter is a mid-range typewriter with a 15-character display and 8Kb memory for saving formats and commonly used phrases such as names and addresses, headings or lists. The 6016 Memorywriter is $895 and is also set for autumn. All the members of the Xerox 60 Series Memorywriter line feature options that include a 50,000 word user-installed spelling checker, a communications interface module that allows the typewriters to be used as letter-quality printers for most personal computers, there is a Teletype emulation facility, and point-to-point communications are supported through an optional modem that is built in to the communications interface module, or by means of an external modem.