Official Name: MemSet
Syscall Address: 0210E0h
Sets a block of memory to the value in A.
- HL: Address of memory block.
- BC: Number of bytes to zero.
- A: Value to set memory block to.
- DE: Points to byte after memory block.
- HL = HL+BC
- DE = HL+1+BC
- BC = 0
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: MemClear
;Clear out pixelShadow with spaces ld a,' ' ld hl,pixelShadow ld bc,8400 call _MemSet