83Plus:BCALLs:4C30

From WikiTI
Revision as of 09:00, 9 July 2010 by Thepenguin77 (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

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 1 or it will erase 65536 bytes.

Example

      ld     hl,appBackUpScreen
      ld     bc,768
      B_CALL MemClear
Retrieved from "https://wikiti.brandonw.net/index.php?title=83Plus:BCALLs:4C30&oldid=9227"