27C256-25N Integrated Circuit - DIP28 - Signetics

27C256-15FA Integrated Circuit - DIP28 - Generic Make

27C256-15I-P Integrated Circuit - DIP28 - Microchip Technology

27C256-20FA Integrated Circuit - DIP28 - Generic Make

27C256-15N Integrated Circuit - DIP28 - Generic Make

27C256-12SF Integrated Circuit - DIP28 - Generic Make

TMS27C128JL Integrated Circuit - DIP28 - Texas Instruments

TMS27C512-1JL Integrated Circuit - DIP28 - Texas Instruments