Depends if 737-200 or 400. Sys A on the 200 I recall did everything while system B did
other lesser bits. If you knew the few items on B, then recalling A was a doddle.
I think you're talking of the 400. I'll dig up both when I get back to base, but I think we
used "A REAL TOY BAT" for SYS B on the 400.