BSAVE

BSAVE and BLOAD are commands in many varieties of the BASIC programming language.

Some platforms provided a BRUN command that, after loading the file into memory, would immediately attempt to execute it as machine code.

Using the BSAVE command, a block of memory at a given address with a specified length can be written to disk as a file.

[2] Microsoft produced the BASIC interpreters that were bundled with the Apple II (1977), Commodore PET (1977), and IBM PC (1981) which included BSAVE and BLOAD.

[3] On the Color Computer's ColorBASIC, those were named SAVEM and LOADM instead, with the M referring to machine code, showing that the primary intent was to load programs rather than data; the use of the B prefix to refer to binary indicates a broader view of the possible uses of the command.