<c800:5) to make sure it contains a jmp instruction. Other locations <that I've seen include c800:6 and cc00:5. In an earlier mail the controller was moted as a WD1002HDO in a kaypro. That tells me mountains, one there is no ISA, NOT PC. The HDO is a host interface essentailly a gerneral interface like a PIO chip. Also the wd1002HDO has no boot or bios roms. The K10 is a z80 machine so c800:5 is not relevent as it's 16bit address. using VAX/VMS notation: $user1:> set device/flame_thrower/temp=plasma Most non-PC systems are _not_ PCs and applying PC part numbers, addresses methods, installation tools, device notation, buses, and dos operating system to the non PC results in confusion if not outright error. $user1:> set device/noflame Allison