| Nr. | Part Name | Description | Manufacturer by |
| 678321 | M27C256B-70B6 | 256 Kbit (32Kb x 8) EPROM, 5V, 70ns | SGS Thomson Microelectronics |
| 678322 | M27C256B-70B6TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678323 | M27C256B-70B6X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678324 | M27C256B-70B7TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678325 | M27C256B-70B7X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678326 | M27C256B-70C1 | 256 KBIT (32KB X8) UV EPROM AND OTP EPROM | ST Microelectronics |
| 678327 | M27C256B-70C1 | 256 Kbit (32Kb x 8) EPROM, 5V, 70ns | SGS Thomson Microelectronics |
| 678328 | M27C256B-70C1TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678329 | M27C256B-70C1TR | 256 Kbit (32Kb x 8) EPROM, 5V, 70ns | SGS Thomson Microelectronics |
| 678330 | M27C256B-70C1X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678331 | M27C256B-70C3 | 256 Kbit (32Kb x 8) EPROM, 5V, 70ns | SGS Thomson Microelectronics |
| 678332 | M27C256B-70C3TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678333 | M27C256B-70C3TR | 256 Kbit (32Kb x 8) EPROM, 5V, 70ns | SGS Thomson Microelectronics |
| 678334 | M27C256B-70C3X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678335 | M27C256B-70C6 | 256 Kbit (32Kb x 8) EPROM, 5V, 70ns | SGS Thomson Microelectronics |
| 678336 | M27C256B-70C6TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678337 | M27C256B-70C6TR | 256 Kbit (32Kb x 8) EPROM, 5V, 70ns | SGS Thomson Microelectronics |
| 678338 | M27C256B-70C6X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678339 | M27C256B-70C7TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678340 | M27C256B-70C7X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678341 | M27C256B-70F1 | 256 Kbit (32Kb x 8) EPROM, 5V, 70ns | SGS Thomson Microelectronics |
| 678342 | M27C256B-70F1TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678343 | M27C256B-70F1X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678344 | M27C256B-70F3 | 256 Kbit (32Kb x 8) EPROM, 5V, 70ns | SGS Thomson Microelectronics |
| 678345 | M27C256B-70F3TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678346 | M27C256B-70F3X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678347 | M27C256B-70F6 | 256 Kbit (32Kb x 8) EPROM, 5V, 70ns | SGS Thomson Microelectronics |
| 678348 | M27C256B-70F6TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678349 | M27C256B-70F6X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678350 | M27C256B-70F7TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678351 | M27C256B-70F7X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678352 | M27C256B-70N1 | 256 Kbit (32Kb x 8) EPROM, 5V, 70ns | SGS Thomson Microelectronics |
| 678353 | M27C256B-70N1TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678354 | M27C256B-70N1TR | 256 Kbit (32Kb x 8) EPROM, 5V, 70ns | SGS Thomson Microelectronics |
| 678355 | M27C256B-70N1X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678356 | M27C256B-70N3 | 256 Kbit (32Kb x 8) EPROM, 5V, 70ns | SGS Thomson Microelectronics |
| 678357 | M27C256B-70N3TR | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678358 | M27C256B-70N3TR | 256 Kbit (32Kb x 8) EPROM, 5V, 70ns | SGS Thomson Microelectronics |
| 678359 | M27C256B-70N3X | 256 Kbit (32Kb x 8) UV EPROM and OTP EPROM | ST Microelectronics |
| 678360 | M27C256B-70N6 | 256 Kbit (32Kb x 8) EPROM, 5V, 70ns | SGS Thomson Microelectronics |
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