diff --git a/coco/src/bus/dwread.c b/coco/src/bus/dwread.c
index d858c6c..d2a59a2 100644
--- a/coco/src/bus/dwread.c
+++ b/coco/src/bus/dwread.c
@@ -16,7 +16,7 @@ byte dwread(byte *s, int l)
         pshs x,y
         ldx :s
         ldy :l
-        jsr [dwreadvec]
+        jsr [0xD93F]
         puls y,x
         tfr cc,b
         lsrb
diff --git a/coco/src/bus/dwwrite.c b/coco/src/bus/dwwrite.c
index aaf2753..93639d3 100644
--- a/coco/src/bus/dwwrite.c
+++ b/coco/src/bus/dwwrite.c
@@ -17,7 +17,7 @@ byte dwwrite(byte *s, int l)
         pshs x,y
         ldx :s
         ldy :l
-        jsr [dwwritevec]
+        jsr [0xD941]
         tfr cc,d
         puls y,x
     }