A semiconductor read only memory having {HEAD ~ a plurality} of MOS transistors and polycrystalline or amorphous silicon resistances connected to {TAIL ~ 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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A semiconductor read only memory having { HEAD ~ a plurality } of MOS transistors and polycrystalline or amorphous silicon resistances connected to { TAIL ~ 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
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH