diff --git a/mach/z8000/libem/printf.s b/mach/z8000/libem/printf.s
index be754072e..5512c4730 100755
--- a/mach/z8000/libem/printf.s
+++ b/mach/z8000/libem/printf.s
@@ -62,10 +62,8 @@ ready:	    !now really print the string we built in the buffer
 	push	*RR14, R3	!count
 	push	*RR14, R1	!buffer
 	push	*RR14, $2	!file descriptor
-	push	*RR14, $4	! write
-	calr	mon
-	pop	R1, *RR14
-	pop	R1, *RR14	! ignore result
+	calr	__write
+	inc	R15, $6
 
 	ldm	R4, savereg, $10
 	pushl	*RR14, saveret
diff --git a/mach/z8000/libem/trp.s b/mach/z8000/libem/trp.s
index aa734397f..4ff5a0c77 100644
--- a/mach/z8000/libem/trp.s
+++ b/mach/z8000/libem/trp.s
@@ -18,7 +18,7 @@ fatal:
 	pushl	*RR14, saveret
 	calr	trp
 	push	*RR14, $1
-	calr	mon
+	calr	__exit
 	!NOTREACHED
 
 trp:
@@ -54,7 +54,7 @@ trp:
 	push	*RR14, $err
 	calr	printf
 	push	*RR14, $1
-	calr	mon
+	calr	__exit
 	!NOTREACHED
 .sect .data
 err:	.asciz	"trap error %d\n"