HP 33s - Manual (Page 309)

User Memory and the Stack B–5
DEG, RAD,
GRAD FIX, SCI,
ENG, ALL DEC, HEX,
OCT, BIN CLVARS
PSE SHOW RADIX . RADIX , CL Σ
† g and STOP ™ and š ‡ * and b *
Y {# }** Y { }** V   V  label nnnn
EQN  FDISP  Errors  e and program
entry 
Switching
binary windows Digit entry
¼ Except when used like CLx.
¼¼ Including all operations performed while the catalog is displayed except
{# } ‘ and { } X , which enable stack lift.