CALL¶

Implementation Note¶

⚠️ Not Implemented: This feature calls machine language (assembly) subroutines and is not implemented in this Python-based interpreter.

Behavior: Statement is parsed but no operation is performed

Why: Cannot execute machine code from a Python interpreter. CALL was used to invoke hand-written assembly language routines for performance-critical operations or hardware access.

Alternative: Use GOSUB to call BASIC subroutines, or DEF FN to define custom functions in BASIC. For related functionality, see USR (also not implemented).

Historical Reference: The documentation below is preserved from the original MBASIC 5.21 manual for historical reference.

Syntax¶

CALL <variable name>[«argument list»]

Purpose¶

To call an assembly language subroutine.

Remarks¶

The CALL statement is one way to transfer program flow to an assembly language subroutine. (See also the USR function, Section 3.40) contains an address that is the starting point in memory of the subroutine. may not be an array variable name. contains the arguments that are passed to the assembly language subroutine. may not contain literals. The CALL statement generates the same calling sequence used by Microsoft's FORTRAN, COBOL and BASIC compilers.

Example¶

110 MYROOT=&HD000
120 CALL MYROOT(I,J,K)