mega128Part #: ATMEGA128. Description: 8-bit Microcontroller with 128K Bytes In-System Programmable Flash. File Size: 360.86 Kbytes. Manufacturer: ATMEL Corporation.Part #: ATMEGA128. Description: 8-bit Microcontroller with 128K Bytes In-System Programmable Flash. File Size: 360.86 Kbytes. Manufacturer: ATMEL Corporation.