{HEAD ~ A semiconductor read only memory} having {TAIL ~ a plurality} of MOS transistors and 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 
{ HEAD ~ A semiconductor read only memory } having { TAIL ~ a plurality } of MOS transistors and 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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