| SBYTE() | convert to SBYTE type |
| SBYTEAT() | direct memory access |
| SET() | set a bit field |
| SIGN() | sign (-1 or +1) |
| SIGNED$() | convert to STRING type (leading "-" or "+") |
| SINGLE() | convert to SINGLE type |
| SINGLEAT() | direct memory access |
| SIZE() | size of variable |
| SGN() | sign (-1, 0, +1) |
| SLONG() | convert to SLONG type |
| SLONGAT() | direct memory access |
| SMAKE() | make a SINGLE type from an XLONG (not a convert) |
| SPACE$() | string of n space characters |
| SQR() | square root |
| SSHORT() | convert to SSHORT type |
| SSHORTAT() | direct memory access |
| STR$() | convert to STRING type (leading "-" or " ") |
| STRING() | convert to STRING type (leading "-" or "") |
| STRING$() | convert to STRING type (leading "-" or "") |
| STUFF$() | stuff one string into another |
| SUBADDR() | convert to SUBADDR type |
| SUBADDRAT() | direct memory access |
| SUBADDRESS() | get address of subroutine |
| TAB() | tab to column n in PRINT statements |
| TRIM$() | trim tabs and spaces from both ends of string |
| TRUNC() | truncate |
| TYPE() | type of variable, array, component |
| UBOUND() | upper bound of array (at any node) |
| UBYTE() | convert to UBYTE type |
| UBYTEAT() | direct memory access |
| UCASE$() | upper case a string |
| ULONG() | convert to ULONG type |
| ULONGAT() | direct memory access |
| USHORT() | convert to USHORT type |
| USHORTAT() | direct memory access |
| VERSION$() | return version number defined by VERSION statement |
| XLONG() | convert to XLONG type |
| XLONGAT() | direct memory access |
| XMAKE() | retype to XLONG from any type (not a convert) |