84PCE:Syscalls:0210E0

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Synopsis

Official Name: MemSet

Syscall Address: 0210E0h

Sets a block of memory to the value in A.

Inputs

  • HL: Address of memory block.
  • BC: Number of bytes to zero.
  • A: Value to set memory block to.

Outputs

  • DE: Points to byte after memory block.

Destroys

  • AF, BC, HL

Comments

This routine uses an LDIR instruction to clear the memory block, so do not pass it a block length of 0 or 1 or it will erase 16777216 bytes.

Example

      ;Clear out pixelShadow with spaces
      ld     a,' '
      ld     hl,pixelShadow
      ld     bc,8400
      call   _MemSet
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