9 GENERAL PURPOSE COMPUTERS AND PERIPHERALS THEREFOR, COMPUTER TERMINALS, COMPUTER NETWORK UNITS, COMPUTER DISK DRIVES AND MAGNETIC DISKS THEREFOR, COMPUTER MEMORIES, COMPUTER COMMUNICATIONS INTERFACE UNITS, COMPUTER REGISTERS, COMPUTER PULSE GENERATORS, COMPUTER MAGNETIC TAPE READERS, COMPUTER MAGNETIC CARD READERS, COMPUTER COMMUNICATIONS CONTROLLERS, COMPUTER MULTIPLEXERS, COMPUTER POWER SUPPLIES AND POWER CONVERTERS, COMPUTER PERIPHERAL ADAPTERS, COMPUTER MAGNETIC TAPE DRIVES AND MAGNETIC TAPES THEREFOR, COMPUTER PERFORMANCE ENHANCEMENT CIRCUIT BOARDS AND CHIPS, PROGRAMMABLE CONTROL UNITS FOR COMPUTERS, MACHINE READABLE INFORMATION CARRIERS, COMPUTER PROGRAMS AND COMPUTER WORKSTATIONS COMPRISED OF SOME OR ALL OF THE FOREGOING; AND MACHINE READABLE INFORMATION CARRIERS AND PRE-RECORDED COMPUTER PROGRAMS ON MAGNETIC TAPES, DISKS, CARDS, CHIPS AND OTHER MACHINE READABLE MEDIA; AND COMPUTER PROGRAMS AND USER MANUALS THEREFOR WHEN SOLD AS A UNIT