可扩充操作系统 EOS ExtendableOperationSystem ; extendable operation system

扩充操作系统磁鼓 [计] extended operating system magnetic drum

扩充操作系统卡片 [计] extended operating system card

扩充的磁盘操作系统 XDOS eXtended Disk Operating System ; [计] extended disk operating system

扩充磁带操作系统 [计] extended tape operating system

扩充的操作系统 extended operating system

扩充的实时操作系统 XRTOS eXtended Real Time Operating System