Nothing to do with SCSI itself, possibly a long time out polling for devices. Some dumb firmware would do silly things like poll each possible target ID and wai

Nothing to do with SCSI itself, possibly a long time out polling for devices. Some dumb firmware would do silly things like poll each possible target ID and wait for a timeout in series. 6 possible devices on an old early SPI bus times a 5 seconds each is getting you in the neighborhood. Having flashbacks to troubleshooting bus termination on DEC equipment.