Only the examples require io

 It should be clear that iec routines don't require io, nor do they touch $BA, although the examples do.

forth/iec.fs

@@ -1,4 +1,3 @@
-require io
 
 code listen ( dv -- )
 here 1+
@@ -67,6 +66,8 @@ $ffa5 jsr, \ acptr
 w ldx, lsb sta,x
 rts, end-code
 
+require io
+
 : iqt readst ioabort ; \ legacy of if quit then
 
 : tfname ( addr len -- )