MPEG-7 is for describing multimedia content via metainformation. There is no MPEG-3. PDA Personal Digital Assistant, what Apple said the Newton would be PLL Phase Locked Loop PNG Portable Network Graphics. The W3C recommended web browser format. Variable transparency, sophisticated interlacing, but no animation.
Files are usually too large for web work without tweaking.
Not as fast as they hoped, and much more expensive than it should be. RTC Real Time Clock SCSI Small Computer System Interface, now with many variations. These two used asynchronous transmissions. Ultra SCSI doubled the bus clock to 20 MHz, data to 20 Mps, and like all later SCSI was synchronous. Fast wide SCSI moved to a 16 bit data path and 68 pin connector, Ultra Wide to 40 Mps, Ultra2 SCSI to 80 Mps and Ultra160 used two bits per data clock to reach 160 Mps.