I figured out what most of my stray DEC boards are-- DLV11 and such. These two baffle me. One might not even be a Q-Bus board like the rest. Mystery board #1: Pull-tab numbers: M7721 (Magenta) Size: Small! regular 5-3/16 inches (132mm) width, but only 5 inches deep, including the fingers, not including the pull tabs. Contents: 4 transistor, some caps, resistors, small glass diodes, 14 ICs which all look to be 7400 series TTL-- counters, flip-flops, quad-NAND, etc Terminator? For what? It's cut for Q-Bus, but it's short. Mystery board #2: Unpopulated (except for U8, the only 28 pin IC on board, a Motorola MC3242A) in other words, empty sockets. Most of the sockets are 14 or 16 pin, except for one 8-pin. 16 of the 16 pin sockets are laid out in two neat rows, which makes me think of memory. There's voltage inverter or charge-pump type chip at U20. Markings: Solder side: "Copyright 1978 by Heath Company" "85-2195" "100478" Component side: "81-2195-3" and "ADDRESS SELECTION" next to 8 jumper pads. Gotta be a Q-Bus memory card, right? [Science] Never express yourself more clearly than you think. --Neils Bohr (1885-1962) --... ...-- -.. . -. ----. --.- --.- -... tpeters at nospam.mixcom.com (remove "nospam") N9QQB (amateur radio) "HEY YOU" (loud shouting) WEB ADDRESS http//www.mixweb.com/tpeters 43? 7' 17.2" N by 88? 6' 28.9" W, Elevation 815', Grid Square EN53wc WAN/LAN/Telcom Analyst, Tech Writer, MCP, CCNA, Registered Linux User 385531