Difference between revisions of "84PCE:Syscalls:0210DC"

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== Comments ==
 
== 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.
 
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.
''See Also: '' [[Category:84PCE:Syscalls:By_Address|0210E0 - MemSet]]
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''See Also: '' [[84PCE:Syscalls:By_Address|0210E0 - MemSet]]
  
 
== Example ==
 
== Example ==

Revision as of 11:17, 26 May 2015


Synopsis

Official Name: MemClear

Syscall Address: 0210DCh

Sets a block of memory to zero.

Inputs

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

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.

See Also: 0210E0 - MemSet

Example

      ;Clear out pixelShadow
      ld     hl,pixelShadow
      ld     bc,8400
      call   _MemClear