What you have is a PDT-11/130. The tapes are TU58s, not TU60s. The PDT series is based on the LSI-11/2 chip set. The systems typically have a console port, printer port, async/sync comm port and three other serial ports. They are setup so that you can use 60 Kb of memory instead of the typical (for -11s) 56Kb (smaller I/O page). Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+