Standard Library

Helper macros from asm/std.asm. Include them after cpu.asm/ext.asm to get simple data routines.

MEMCPY

• Syntax: MEMCPY [dsthi:dstlo] [srchi:srclo] len
• Inputs: srchi:srclo source pointer, dsthi:dstlo destination pointer, len stop value.
• Behavior: Copies bytes from source to destination while an internal counter in A walks from 0 up to len. That means it copies len + 1 bytes. Source and destination advance with INC16. Restores the original A after finishing.
• Scratch: uses stack to save A; flags from CMP, INC, INC16.

STRCMP

• Syntax: STRCMP i j srchi srclo dsthi dstlo
• Inputs: srchi:srclo first string pointer, dsthi:dstlo second string pointer.
• Outputs: i receives 0 when strings match, 1 otherwise.
• Behavior: Walks both zero-terminated strings byte-by-byte. Returns early on mismatch, or when a 0x00 terminator is reached on both sides.
• Scratch: uses i, j, flags from CMP, CMPI, JZR/JNZR, and increments addresses with INC16.