{HEAD ~ A semiconductor read only memory} having a plurality of MOS transistors and polycrystalline or amorphous silicon resistances connected to the source or drain regions of the MOS transistors, {TAIL ~ laser beams} irradiating selected silicon resistances to thermally activate those resistances and store the required data 
having
{ HEAD ~ A semiconductor read only memory } having a plurality of MOS transistors and polycrystalline or amorphous silicon resistances connected to the source or drain regions of the MOS transistors , { TAIL ~ laser beams } irradiating selected silicon resistances to thermally activate those resistances and store the required data
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