Does anyone know exactly what was in the Lobo branded "SASI" external hard drive? I've managed to convince my Max-80 to talk with a 10MB MFM drive behind an Adaptec ACB-4000 bridge controller. It formats and verifies without a complaint, accepts bad sector information and creates a working CP/M volume. But, for some reason I cannot get it to boot from the hard disk. It won't be the end of the world if I have to cold-start from a floppy, but my curiousity is getting the better of me. The utility that writes the boot sectors works fine - there's a brief flicker of drive activity and no error messages. When I set the DIP switches to cold-boot the hard disk, I can see the busy LED on the bridge board light up solid and the machine freezes. Under normal I/O, the drive activity LED illuminates at the same time as the one on the ACB-4000, but at boot I never see the drive itself respond. I'm assuming that there's some incompatibility between the ACB-4000 and the boot PROM. It would help to know what it's expecting to see. I've been digging through the boot ROM sources, but nothing jumps out so far. FWIW, I've tried an Adaptec ACB-5500 controller (same results), a Xebec 1410 (won't format or verify, but can be written/read) and a Xebec 1410A (I/O errors). Steve --