got I would be surprised if that did work. There are some hardware differences in the 100A and 100B. The graphics hardware is slightly different, and the quantity of memory on the motherboard is different. I'm sure there are also more subtle differences which I didn't mention. Anyway, it proably wouldn't work, but then again, I've never tried. There are also other differnces that have nothing to do with the firmware. The 100A used an AC fan, while the 100B used a quieter DC fan. The 100A power supply was not quite beefy enough to run the big hard drives, although it would unreliably work. The power connector on the 100A for the second drive was also excessively short so it wouldn't reach the standard DEC hard drives alone anyway. Usually, 100As have the block letter logo on the front, while 100Bs have the script Rainbow logo. -Jeff jba at sdf.lonestar.org SDF Public Access UNIX System - http://sdf.lonestar.org