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, {HEAD ~ laser beams} irradiating {TAIL ~ selected silicon resistances} to thermally activate those resistances and store the required data 
irradiating
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 , { HEAD ~ laser beams } irradiating { TAIL ~ selected silicon resistances } to thermally activate those resistances and store the required data
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