diff --git a/DRV/MKBOARD.DRV.S.txt b/DRV/MKBOARD.DRV.S.txt
index 22498a10..8a6f231d 100644
--- a/DRV/MKBOARD.DRV.S.txt
+++ b/DRV/MKBOARD.DRV.S.txt
@@ -50,8 +50,11 @@ Dev.Detect		>STYA ARGS
 				sec
 				lda (ZPArgPtr),y
 				sbc (ZPArgPtr),y
-				cmp #5
-				beq .4
+				sec
+				sbc #5				looking for 5 cycles between reads
+				cmp #2				or 6 cycles with the FastChip //e
+
+				bcc .4
 
 .3				inc FD.DEV.NAME+3
 				inc ZPArgPtr+1			no match, try next slot....