Data file used by Soft6502 Trainer/Simulator, a program that simulates the behavior of a single board 650 computer; contains 6502 code and data that can be saved and loaded at a later time.

The H6X file stores 6502 code in ASCII text format, which allows the file to be edited by any text editor. The file is made up of a sequence of addresses and hexadecimal opcode. The format uses the first 4 hex digits on each line specify the current address, which is followed by 1 to 16 code bytes that consist of 2 hex digits each. The format is designed to be easy to understand, create and edit.