Atari XF551


	Controller              WD2793
	Processor		65C02
	Clock speed		1 MHz
	RAM			???
	ROM			Probably 8KB (???)
	Serial Speed		19200 Baud and 38400 Baud
	Storage			Single Density (FM)
				  Side(s)	 1
				  Tracks	 40
				  Sectors/Track	 18
				  Bytes/Sector	 128
				  Total space	 90 KB
				Enhanced Density (MFM)
                                  Side(s)        1
                                  Tracks         40
                                  Sectors/Track  26
                                  Bytes/Sector   128
                                  Total space    130 KB
				  Comment	 Also known as Medium- or
						 1050 Double Density
				Double Density (MFM)
				  Side(s)        1
                                  Tracks         40
                                  Sectors/Track  18
                                  Bytes/Sector   256
                                  Total space    180 KB
				Quad Density (MFM)
                                  Side(s)        2
                                  Tracks         40
                                  Sectors/Track  18
                                  Bytes/Sector   256
                                  Total space    360 KB
        Release year            ???
        Production stopped      ???