string asis include 'gsos.equ' stubs proc export change_path export create export destroy export erase_disk export format export set_eof export set_file_info export write change_path close create destroy erase_disk flush format get_dev_num get_dir_entry get_eof get_file_info get_mark judge_name open read set_eof set_file_info set_mark write volume lda #invalid_fst_op sec rtl endp end