| 27S21ADM/B | 
                                        Rochester Electronics | 
                                        1,062 | 
                                        OTP ROM, 256X4, 60NS, TTL | 
                                    
                                                                    
                                        | 27S21AJC | 
                                        Rochester Electronics | 
                                        5,142 | 
                                        OTP ROM, 256X4, 60NS, TTL | 
                                    
                                                                    
                                        | 27S21APC | 
                                        Rochester Electronics | 
                                        6,246 | 
                                        OTP ROM, 256X4, 60NS, TTL | 
                                    
                                                                    
                                        | 27S21DM/B | 
                                        Rochester Electronics | 
                                        15 | 
                                        OTP ROM, 256X4, 60NS, TTL CDIP16 | 
                                    
                                                                    
                                        | 27S21PC | 
                                        Rochester Electronics | 
                                        10,495 | 
                                        OTP ROM, 256X4, 60NS, TTL | 
                                    
                                                                    
                                        | 27S23AJC | 
                                        Rochester Electronics | 
                                        3,251 | 
                                        PROGRAMMABLE ROM | 
                                    
                                                                    
                                        | 27S23JC | 
                                        Rochester Electronics | 
                                        4,235 | 
                                        27S23JC | 
                                    
                                                                    
                                        | 27S25ADM/B | 
                                        Rochester Electronics | 
                                        21 | 
                                        PROGRAMMABLE ROM | 
                                    
                                                                    
                                        | 27S25AJC | 
                                        Rochester Electronics | 
                                        5,307 | 
                                        27S25AJC | 
                                    
                                                                    
                                        | 27S29ADC | 
                                        Rochester Electronics | 
                                        519 | 
                                        4,096-BIT (512X8) BIPOLAR PROM | 
                                    
                                                                    
                                        | 27S29ADM/B | 
                                        Rochester Electronics | 
                                        35,000 | 
                                        27S29A - 4K-BIT (512X8) BIPOLAR | 
                                    
                                                                    
                                        | 27S29AJC | 
                                        Rochester Electronics | 
                                        2,866 | 
                                        PROGRAMMABLE ROM | 
                                    
                                                                    
                                        | 27S29DC | 
                                        Rochester Electronics | 
                                        35,000 | 
                                        4,096-BIT (512X8) BIPOLAR PROM | 
                                    
                                                                    
                                        | 27S29DM/B | 
                                        Rochester Electronics | 
                                        35,000 | 
                                        27S29 - 4K-BIT (512X8) BIPOLAR P |