At this point, I've made the assumption that the FM-Towns SCSI controller is the same as that used on the FMR-50 (8086/186/286 based predecessor to the FM-Towns), as much of the Towns hardware is backwards compatible to it. So, I've quickly looked through Toshiya Takeda's source project, which has FMR-50 emulation. It seems light on details (maybe I'm not looking in the right place :)), but it does tell me which status and control bits go where.
Last edited by mahlemiut; 10/10/10 09:47 PM.