Add original unix v6

2018-01-27 22:35:41 +09:00
commit 2c7099ee50
664 changed files with 106254 additions and 0 deletions
@@ -0,0 +1,20 @@
+.globl	backspace
+.globl	lookchar
+.globl	w, r, a, l
+/
+/	routine to read a string backwards
+/	the read pointer is decremented before reading
+/
+/	mov	...,r1
+/	jsr	pc,backspace
+/	mov	r0,...
+/
+backspace:
+	cmp	a(r1),r(r1)
+	bhis	nochc
+	dec	r(r1)
+	jsr	pc,lookchar
+	rts	pc
+nochc:	clr	r0
+	sec
+	rts	pc