I tried searching the agilent web site, hoping they might have been kind to users of their obsolete equipment. Indeed, they were nice enough to post the manual for the 1631D, which is the model I have. They didn't provide any disk images for the Z80 inverse assembler, aka disassembler, software. Does anybody on the list know of a source of this software, or perhaps has it and is willing to make a dup? I have a Wang 2275 storage unit (hard disk + floppy) that fails to boot up, and it uses a Z80 as the controller. Fortunately, I have a second, working, 2275. By switching the disks between the units I have been able to image both hard drives, but it would be nice to get the 2nd unit going. Thanks.