To clean up some of the questions: We (in our group) owned successively two photographic typesetters: The original Graphics Systems C/A/T, which was used to render the camera- ready copy for several editions of the manual, also the first edition of K&R as well as other books. This exposed characters by flashing a Xenon lamp through a spinning cylinder with the character images arranged around the axis; the character was imaged onto a fiber-optic bundle, which moved horizontally with respect to the paper. The paper was moved vertically. The Linotron 202; it had a CRT on which lines of characters were drawn, with an unmoving, line-wide fiber bundle. Rollers moved the paper vertically. Both of these were managed by us (including the hardware connection, via DR11-C; it stood in for the paper tape that the manufacturers had intended). These used chemical processing to develop the paper. This was messy and (especially for the C/A/T version) smelly, so we were glad when the local Comp Center began offering service on an Autologic APS-5, a machine similar in design to the 202, but better engineered, and the comp center managed the chemistry. This was used for the second edition of K&R, for example. I think what we sent was troff output which the CC converted to Postscript. Later this service was outsourced, then dropped. In recent years laser printers have become good enough that decent camera-ready copy can be generated using them (e.g. for Kernighan and Pike, The Practice of Programming). As for the system aspects: K&R 1 (1978) was done on what would soon be 7th edition Unix, on 11/70; K&R 2 (1988) using 9th edition on VAX 8550. Kernighan and Pike's Unix Programming Evironment (1984) used 8th edition on VAX 11/750. About the releases (or pseudo releases) that Norman mentions: actually 8th edition was somewhat real, in that a consistent tape and captured, probably corresponds fairly well with its manual, and was educationally licensed for real, though not in large quantity. 9th and 10th were indeed more conceptual in that we sent stuff to people (e.g. Norman) who asked, but they weren't collected in complete and coherent form. Dennis