Difference between revisions of "83Plus:BCALLs:4C30"
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Thepenguin77 (Talk | contribs) (added that length of 1 clears ram) |
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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 it will erase 65536 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 65536 bytes. |
== Example == | == Example == | ||
Latest revision as of 09:00, 9 July 2010
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
