‘Why don’t you implement time-tag recording in your TCSPC cards?’ This is one of the questions the bh user support is often asked. It is indeed hard to believe why we don’t: We cannot implement it because it is there – since 1996. The time-tag mode was first implemented in the SPC-431 and -432 cards, one year later in the SPC-630 cards. It is implemented in all currently available bh TCSPC modules, including the SPC-134, SPC-144, and SPC-154 four-channel packages. Unfortunately, nobody talked about time-tagging in 1996, and so the mode was termed ‘FIFO Mode’.