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The following list summarizes differences between Liberty BASIC and MS-DOS BASICs that would normally not cause a syntax error, but nonetheless have significant differences.
Jump to N O P R S T U V W
N- NEXT cannot accept more than one variable.
- NOT
- Becomes a function.
- Returns a boolean value; not a bitwise negation.
O- ON ERROR
- Label or line number must be in scope; no global error handler.
- Error trapping is not disabled by ON ERROR GOTO 0
- (PB) ON ERROR RESUME NEXT is not implemented.
- OPEN
- Creates a #handle.
- LEN= accepts a literal number only.
P- PEEK is not implemented.
- PRINT USING
- USING becomes a function: USING(format$, num).
- Format string accepts only pounds (#) and a point (.).
- Repeated calls to USING may be necessary.
- Commas have the same meaning as for PRINT.
- PUT
- Is not a graphics command.
- Requires a record index.
- Cannot be used with BINARY files.
R- RANDOMIZE accepts real numbers between 0.0 and 1.0.
- READ
- Cannot read directly into array elements
- Also see DATA.
- RESUME does not accept any parameters; always resumes at the place of the error.
- RETURN does not accept any paramters; always returns to the statement after the GOSUB.
- RMDIR becomes a function.
- RND is always called with a single parameter.
- RUN can execute any executable file, but not a .BAS; similar to SHELL.
S
- SEEK is a statement only.
- SELECT CASE
- CASE a TO b is not supported.
- CASE IS is not supported.
- SGN is not supported.
- STOP is a synonym for END.
- STRING$ is not supported.
- SUB requires using no parentheses.
E.g. SUB MySub Testing$, One, Two, Three T
- TIME$
- Becomes a function.
- Cannot change a PC's clock.
U- USING$ (PB) becomes USING, but is more limited. See PRINT USING.
V- VAL cannot convert hex (e.g. &HFF) and octal (e.g. &337 or &O377) strings.
W- WAIT is not hardware/port related.
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