Technical Comitte T10 --http://www.t10.org
information about I/O Interfaces, especially SCSI, SCSI-2, and SCSI-3 including SPI, Fast-20 (Ultra SCSI), Fast-40 (Ultra2 SCSI), Low Voltage Differential (LVD), SPI-3 (Ultra3 SCSI or Ultra160), SPI-4 (Ultra320), SPI-5 (Ultra640), CAM, and much more