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