diff --git a/libsrc/runtime/Makefile b/libsrc/runtime/Makefile
index fdb7fc650..45a7d1ad6 100644
--- a/libsrc/runtime/Makefile
+++ b/libsrc/runtime/Makefile
@@ -131,6 +131,9 @@ OBJS = 	add.o		\
        	mul.o  		\
 	mulax3.o	\
 	mulax5.o	\
+	mulax6.o	\
+	mulax7.o	\
+	mulax9.o	\
 	mulax10.o	\
        	ne.o   		\
        	neg.o  		\
diff --git a/libsrc/runtime/mulax6.s b/libsrc/runtime/mulax6.s
new file mode 100644
index 000000000..e5e350385
--- /dev/null
+++ b/libsrc/runtime/mulax6.s
@@ -0,0 +1,30 @@
+;
+; Ullrich von Bassewitz, 16.03.2002
+;
+; CC65 runtime: Multiply the primary register
+;
+
+   	.export	      	mulax6
+	.importzp     	ptr1
+
+.proc	mulax6
+
+	sta     ptr1
+	stx	ptr1+1
+	asl	a
+	rol	ptr1+1
+	clc
+	adc	ptr1
+	pha
+	txa
+	adc	ptr1+1
+	sta	ptr1+1
+	pla
+	asl	a
+	rol	ptr1+1
+ 	ldx	ptr1+1
+	rts
+
+.endproc
+
+
diff --git a/libsrc/runtime/mulax7.s b/libsrc/runtime/mulax7.s
new file mode 100644
index 000000000..b7ce28cff
--- /dev/null
+++ b/libsrc/runtime/mulax7.s
@@ -0,0 +1,32 @@
+;
+; Ullrich von Bassewitz, 16.03.2002
+;
+; CC65 runtime: Multiply the primary register
+;
+
+   	.export	    	mulax7
+	.importzp      	ptr1, tmp1
+
+.proc	mulax7
+
+	sta	ptr1
+	stx	ptr1+1
+	stx   	tmp1
+	asl   	a
+	rol   	tmp1	    		; * 2
+	asl	a
+	rol	tmp1			; * 4
+	asl	a
+	rol	tmp1			; * 8
+	sec
+	sbc	ptr1
+	pha
+	lda	tmp1
+	sbc	ptr1+1			; * (8 - 1)
+	tax
+	pla
+	rts
+
+.endproc
+
+
diff --git a/libsrc/runtime/mulax9.s b/libsrc/runtime/mulax9.s
new file mode 100644
index 000000000..037f5e76e
--- /dev/null
+++ b/libsrc/runtime/mulax9.s
@@ -0,0 +1,32 @@
+;
+; Ullrich von Bassewitz, 16.03.2002
+;
+; CC65 runtime: Multiply the primary register
+;
+
+   	.export	    	mulax9
+	.importzp      	ptr1, tmp1
+
+.proc	mulax9
+
+	sta   	ptr1
+	stx   	ptr1+1
+	stx   	tmp1
+	asl   	a
+	rol   	tmp1	    		; * 2
+	asl   	a
+	rol   	tmp1			; * 4
+	asl   	a
+	rol   	tmp1			; * 8
+	clc
+	adc   	ptr1			; * (8+1)
+	pha
+	lda	tmp1
+	adc	ptr1+1
+	tax
+	pla
+	rts
+
+.endproc
+
+