Dir cleanup

src/copy.asm

@@ -0,0 +1,22 @@
+BITS 16
+CPU 8086
+
+main:
+    mov bp, sp
+    mov si, [bp+4]
+    mov cx, [si]
+    mov si, [bp+6]
+    mov di, [si]
+    mov si, [bp+8]
+    mov si, [si]
+    push ds
+    push es
+    mov ax, cs
+    mov ds, ax
+    mov es, ax
+    cld
+    rep movsw
+    pop es
+    pop ds
+
+    retf 6