AttoChess, a complete, playable chess program for 16-bit x86 DOS in 278 bytes

The original renders the position into a separate buffer: it walks the board, transforms each square into a printable character, stores it, appends a $ terminator, and prints the whole string with DOS function 09h ( int 21h ). That path costs a buffer pointer setup, the copy loop's store, the terminator write, and, because the buffer lives after the board, a reserved board array in the image.