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| # | Part: | Description: | Manuf. | Package | Pins | T°min | T°max | PDF size |
| 1. |  27C256 | 262,144-Bit (32K x 8) High Performance CMOS EPROM | National Semiconductor | NSC | - | - | - | 194 Kb |
| 2. | 27C256 | 64K(8K x 8) UV ERASABLE PROMs | Intel Corporation | INTEL | - | - | - | 1.29 Mb |
| 3. | 27C256 | 256K-bit CMOS EPROM (32K x 8) | NXP Semiconductors | PHILIPS | - | - | - | 568 Kb |
| 4. | 27C256 | 256K (32K x 8) CMOS EPROM | Microchip Technology | MICROCHIP | - | - | - | 76 Kb |
| 5. | D27C256 | 256 Kilobit (32,768 x 8-Bit) CMOS EPROM | Advanced Micro Devices | AMD | - | - | - | 103 Kb |
| 6. | AS27C256 | 256K UVEPROM UV Erasable Programmable Read-Only Memory | Austin Semiconductor | AUSTIN | - | - | - | 294 Kb |
| 7. | AT27C256 | 256K 32K x 8 OTP CMOS EPROM | ATMEL Corporation | ATMEL | - | - | - | 260 Kb |
| 8. | AM27C256 | 256 Kilobit (32 K x 8-Bit) CMOS EPRO | Advanced Micro Devices | AMD | - | - | - | 94 Kb |
| 9. | CY27C256 | 32K x 8-Bit CMOS EPROM | Cypress Semiconductor | CYPRESS | - | - | - | 271 Kb |
| 10. | FM27C256 | 262,144-Bit (32K x 8) High Performance CMOS EPROM | Fairchild Semiconductor | FAIRCHILD | - | - | - | 110 Kb |
| 11. | MX27C256 | 256K-BIT [32K x 8] CMOS EPROM | Macronix International | MCNIX | - | - | - | 777 Kb |
| 12. | NM27C256 | 262,144-Bit (32K x 8) High Performance CMOS EPROM | National Semiconductor | NSC | - | - | - | 194 Kb |
| 13. | NM27C256 | 262,144-Bit (32K x 8) High Performance CMOS EPROM | Fairchild Semiconductor | FAIRCHILD | - | - | - | 121 Kb |
| 14. | AMD27C256 | 256 Kilobit (32,768 x 8-Bit) CMOS EPROM | Advanced Micro Devices | AMD | - | - | - | 103 Kb |
| 15. | SMJ27C256 | Built-in adjustable OSC | SamHop Microelectronics Corp. | SAMHOP | - | - | - | 188 Kb |
| 16. | SMJ27C256 | 256K UVEPROM | Austin Semiconductor | AUSTIN | - | - | - | 138 Kb |
| 17. | TMS27C256 | TMS27C256 32768 BY 8-BIT UV ERASABLE TMS27PC256 32768 BY 8-BIT PROGRAMMABLE READ-ONLY MEMORIES | Texas Instruments | TI | - | - | - | 195 Kb |
| 18. | NMC27C256 | 262, 144-Bit (32k X 8) UV Erasable CMOS PROM | National Semiconductor | NSC | - | - | - | 331 Kb |
| 19. | 27C256-10 | 256K-BIT [32K x 8] CMOS EPROM | Macronix International | MCNIX | - | - | - | 777 Kb |
| 20. | 27C256-10 | 256K (32K x 8) CMOS EPROM | Microchip Technology | MICROCHIP | - | - | - | 76 Kb |
