qsam การใช้

QSAM offers device independence : to the extent possible, the same API calls are used for different devices.
Programmers utilize various access methods ( such as QSAM or VSAM ) in programs for reading and writing data sets.
QSAM is as its name says queued, in this specific context meaning buffered with deblocking of reads and blocking of writes.
QSAM is used both for devices that are naturally sequential, such as punched card readers and punches and line printers, and for data on devices that could also be addressed directly, such as magnetic disks.
Microgravity experiments and facilities on IML-2 included : Applied Research on Separation Methods ( RAMSES ) in Rack 6, Bubble, Drop and Particle Unit ( BDPU ) in Rack 8, Critical Point Facility ( CPF ) in Rack 9, Electromagnetic Containerless Processing Facility ( TEMPUS ) in Rack 10, Free Flow Electrophoresis Unit ( FFEU ) in Rack 3, Large Isothermal Furnace ( LIF ) in Rack 7, Quasi Steady Acceleration Measurement ( QSAM ) in Rack 3, Space Acceleration Measurement System ( SAMS ) in the Center Isle, and Vibration Isolation Box Experiment System ( VIBES ) in Rack 3.