name: HT27C020_DIPSOP32 function: OTP CMOS 256Kx8-Bit EPROM package: DIP/SOP32,32 manufacturer: Holtek +--()--+ VPP | 1 32| VCC A16 | 2 31| PGMB A15 | 3 30| A17 A12 | 4 29| A14 A7 | 5 28| A13 A6 | 6 27| A8 A5 | 7 26| A9 A4 | 8 25| A11 A3 | 9 24| OEB A2 |10 23| A10 A1 |11 22| CEB A0 |12 21| DQ7 Q0 |13 20| DQ6 DQ1 |14 19| DQ5 DQ2 |15 18| DQ4 VSS |16 17| DQ3 +------+ This pinout came from the Chipdir: http://www.chipdir.org/ name: HT27C020_PLCC32 function: OTP CMOS 256Kx8-Bit EPROM package: PLCC32,32 manufacturer: Holtek +--------+---------+---------+----------+ | 1 - VPP| 9 - A3 | 17 - DQ3| 25 - A11 | | 2 - A16| 10 - A2 | 18 - DQ4| 26 - A9 | | 3 - A15| 11 - A1 | 19 - DQ5| 27 - A8 | | 4 - A12| 12 - A0 | 20 - DQ6| 28 - A13 | | 5 - A7 | 13 - DQ0| 21 - DQ7| 29 - A14 | | 6 - A6 | 14 - DQ1| 22 - CEB| 30 - A17 | | 7 - A5 | 15 - DQ2| 23 - A10| 31 - PGMB| | 8 - A4 | 16 - VSS| 24 - OEB| 32 - VCC | +--------+---------+---------+----------+ This pinout came from the Chipdir: http://www.chipdir.org/