Upon the date 05:03 PM 3/31/99 -0500, Megan said something like: Wow! Cool! Looks like you have a W9042 Extender Board which is specifically described as part of the FP11-A Option in my KK11-A tech manual and by association, one is also part of the KK11-A cache option. The manual mentions: "The W9042 Extender board Assy. is stored in the backplane and used for some maintenance operations." When you have to use an extender board to troubleshoot the adjacent M8265 in a cache-option-only system, the W9042 plugs into the top connector on the M8268 Cache module and then the over-the-top connector plugs the two together. If troubleshooting the M8268, then the W9042 is plugged into the top conn of the 8265 and the o-t-t conn board connects both together. Neat! Same for troubleshooting the systems with both cache and FP11 options except two W9042s are used. As for storing it in the backplane, DEC apparently chose to make some use of the thing by using it as a G727A type device. No details at all mentioned in my KK11-A cache tech manual about the W9042, just a simple line drawing showing how it and the M-boards are used together. Maybe something further is said about the extender in the FP11-A tech manual but I have none. Since you say it has two sets of fingers with one wired as BG, and the line dwg I see sure looks like it has two fingers, then it likely is stored in slots C-D. This assumes the DEC service person has a G727A or two in his tool box as when the W9042 is used, there would be no BG otherwise. I've got an extra set of them too plus a cache. No spare FP11 tho. Notice how heavy that FP11 is? Sure is a lot of 'stone' in all those AMD 2901s! Regards, Chris -- -- Christian Fandt, Electronic/Electrical Historian Jamestown, NY USA cfandt(a)netsync.net Member of Antique Wireless Association URL: http://www.ggw.org/awa