View source for 83Plus:BCALLs:4C30

[[Category:83Plus:BCALLs:By_Name:Memory|MemClear]] [[Category:83Plus:BCALLs:By_Name|MemClear]] [[Category:83Plus:BCALLs:By_Address|4C30 - MemClear]]
== Synopsis ==
'''Official Name:''' MemClear

'''BCALL Address:''' 4C30

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 it will erase 65536 bytes.

== Example ==
 <nowiki>
      ld     hl,appBackUpScreen
      ld     bc,768
      B_CALL MemClear</nowiki>