V5/usr/source/s4/chdir.s

Find at most related files.
including files from this version of Unix. 
/ C library -- chdir

/ error = chdir(string);

.globl	_chdir, retrn, cerror

_chdir:
	mov	r5,-(sp)
	mov	sp,r5
	mov	4(r5),0f
	sys	0; 9f
	bec	1f
	jmp	cerror
1:
	clr	r0
	jmp	retrn
.data
9:
	sys	chdir; 0:..