Hi, I assume you have left the B26 platform for a long time ago. But what you had in your hand was a excellent machine, with no comparison at that time, think about running multitasking on an 80186 platform, no one else, as far I know, has done that. You can not boot on any DOS/Windows disks, you have to have an B26 operating system, the prompt V 9.2 B,D,L,M,P,T:_ is at debug level, you can choose here to boot on varios sources, but again you need an old BTOS/CTOS os I did work for Burroughs-Unisys- and a Unisys consultant company at that time working primary with BTOS/CTOS. Best regards / Med venlig hilsen Henrik Bigum IT-Consultant KPLL Pilestr?de 65 1112 K?benhavn K e-mail hb(a)kpll.dk Phone +4533744100 Fax +4533744001