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The _MEMPUT statement writes data to a portion of a designated memory block at an OFFSET position.


_MEMPUT memoryBlock, bytePosition, sourceVariable [AS type]


  • memoryBlock is a _MEM variable type memory block name created by _MEMNEW or the _MEM function.
  • bytePosition is the memoryBlock.OFFSET start position plus any bytes needed to read specific values.
  • The sourceVariable type designates the size and bytePosition it should be written to. It can be a variable, array or user defined type.
  • bytePosition can be converted AS a specific variable type before being written to the memoryBlock as bytes.


  • The _MEMPUT statement is similar to the PUT file statement, but bytePosition is required.
  • The memoryBlock.OFFSET returns the starting byte position of the block. Add bytes to move into the block.
  • The variable type held in the memory block can determine the next byte position to write a value.
  • LEN can be used to determine the byte size of numerical or user defined variable types regardless of the value held.
  • STRING values should be of a defined length. Variable length strings can actually move around in memory and not be found.


Example: _MEMPUT can be used just like POKE without DEF SEG.

DIM o AS _MEM o = _MEM(d&) _MEMPUT o, o.OFFSET + 1, 3 AS _UNSIGNED _BYTE 'POKE v = _MEMGET(o, o.OFFSET + 1, _UNSIGNED _BYTE) 'PEEK PRINT v 'prints 3 PRINT d& 'print 768 because the 2nd byte of d& has been set to 3 or 3 * 256

See also

Keyword Reference - Alphabetical
Keyword Reference - By Usage
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