diff --git a/libsrc/runtime/decsp2.s b/libsrc/runtime/decsp2.s
index 86536c83d..c92da4d31 100644
--- a/libsrc/runtime/decsp2.s
+++ b/libsrc/runtime/decsp2.s
@@ -5,27 +5,23 @@
 ;
 
        	.export	  	decsp2
-	.importzp	sp
+ 	.importzp	sp
 
 .proc	decsp2
 
-	ldy	sp
-       	beq	@L1
-       	dey
-       	beq	@L2
-       	dey
-       	sty	sp
-       	rts
+	lda	sp
+	sec
+	sbc	#2
+	sta	sp
+	bcc	@L1
+	rts
 
-@L1:	dey
-@L2:    dey
-       	sty	sp
-       	dec	sp+1
+@L1:	dec	sp+1
 	rts
 
 .endproc
-	
 
 
 
-	
+
+
diff --git a/libsrc/runtime/decsp3.s b/libsrc/runtime/decsp3.s
index 0b81bea7c..9401c3dc5 100644
--- a/libsrc/runtime/decsp3.s
+++ b/libsrc/runtime/decsp3.s
@@ -5,16 +5,23 @@
 ;
 
        	.export	  	decsp3
-	.import		subysp
+       	.importzp	sp
 
 .proc	decsp3
 
-	ldy	#3
-	jmp	subysp
+	lda	sp
+	sec
+	sbc	#3
+	sta	sp
+	bcc	@L1
+	rts
+
+@L1:	dec	sp+1
+	rts
 
 .endproc
 
 
 
 
-	
+
diff --git a/libsrc/runtime/decsp4.s b/libsrc/runtime/decsp4.s
index e2220bf74..851339072 100644
--- a/libsrc/runtime/decsp4.s
+++ b/libsrc/runtime/decsp4.s
@@ -5,16 +5,23 @@
 ;
 
        	.export	      	decsp4
-	.import		subysp
+       	.importzp	sp
 
 .proc	decsp4
 
-	ldy	#4
-	jmp	subysp
+	lda	sp
+	sec
+	sbc	#4
+	sta	sp
+	bcc	@L1
+	rts
+
+@L1:	dec	sp+1
+	rts
 
 .endproc
 
 
 
 
-	
+
diff --git a/libsrc/runtime/decsp5.s b/libsrc/runtime/decsp5.s
index bece7415c..0519bf480 100644
--- a/libsrc/runtime/decsp5.s
+++ b/libsrc/runtime/decsp5.s
@@ -5,16 +5,23 @@
 ;
 
        	.export	      	decsp5
-	.import		subysp
+	.importzp	sp
 
 .proc	decsp5
 
-	ldy   	#5
-	jmp	subysp
+	lda	sp
+	sec
+	sbc	#5
+	sta	sp
+	bcc	@L1
+	rts
+
+@L1:	dec	sp+1
+	rts
 
 .endproc
 
 
 
 
-	
+
diff --git a/libsrc/runtime/decsp6.s b/libsrc/runtime/decsp6.s
index 964320b40..31d6ec9dc 100644
--- a/libsrc/runtime/decsp6.s
+++ b/libsrc/runtime/decsp6.s
@@ -5,16 +5,23 @@
 ;
 
        	.export	      	decsp6
-	.import		subysp
+       	.importzp	sp
 
 .proc	decsp6
 
-	ldy   	#6
-	jmp	subysp
+	lda	sp
+	sec
+	sbc	#6
+	sta	sp
+	bcc	@L1
+	rts
+
+@L1:	dec	sp+1
+	rts
 
 .endproc
 
 
 
 
-	
+
diff --git a/libsrc/runtime/decsp7.s b/libsrc/runtime/decsp7.s
index 080c9b0c5..249b00baa 100644
--- a/libsrc/runtime/decsp7.s
+++ b/libsrc/runtime/decsp7.s
@@ -5,16 +5,21 @@
 ;
 
        	.export	      	decsp7
-	.import		subysp
+	.importzp	sp
 
 .proc	decsp7
 
-	ldy   	#7
-	jmp	subysp
+	lda	sp
+	sec
+	sbc	#7
+	sta	sp
+	bcc	@L1
+	rts
+
+@L1:	dec	sp+1
+	rts
 
 .endproc
 
 
 
-
-	
diff --git a/libsrc/runtime/subysp.s b/libsrc/runtime/subysp.s
index b173daf69..e2bbd5fc6 100644
--- a/libsrc/runtime/subysp.s
+++ b/libsrc/runtime/subysp.s
@@ -9,7 +9,6 @@
 
 .proc	subysp
 
-	pha			; Save A
        	sty    	tmp1		; Save the value
 	lda	sp    		; Get lo byte
 	sec
@@ -17,12 +16,11 @@
 	sta	sp  	  	; Put result back
 	bcs	@L1
 	dec	sp+1
-@L1:	pla	   		; Restore A
-	rts			; Done
+@L1:   	rts			; Done
 
 .endproc
 
 
 
 
-	
+