diff --git a/src/kernal/iec/chkin_iec.s b/src/kernal/iec/chkin_iec.s
index 6112239f..7ae9b82f 100644
--- a/src/kernal/iec/chkin_iec.s
+++ b/src/kernal/iec/chkin_iec.s
@@ -14,7 +14,7 @@ chkin_iec:
 
 	; Fail if the file is open for writing (secondary address 1)
 	
-	lda LAT, Y
+	lda SAT, Y
 	cmp #$01
 	+beq chkin_file_not_input
 
@@ -24,7 +24,7 @@ chkin_iec:
 	jsr TALK
 	+bcs chkinout_device_not_present
 
-	lda LAT, Y
+	lda SAT, Y
 	ora #$60
 	jsr TKSA
 	+bcs chkinout_device_not_present
diff --git a/src/kernal/iec/ckout_iec.s b/src/kernal/iec/ckout_iec.s
index 02719b5f..5141c79b 100644
--- a/src/kernal/iec/ckout_iec.s
+++ b/src/kernal/iec/ckout_iec.s
@@ -14,7 +14,7 @@ ckout_iec:
 
 	; Fail if the file is open for reading (secondary address 0)
 	
-	lda LAT, Y
+	lda SAT, Y
 	+beq ckout_file_not_output
 
 	; Send LISTEN + SECOND first
@@ -23,7 +23,7 @@ ckout_iec:
 	jsr LISTEN
 	+bcs chkinout_device_not_present
 
-	lda LAT, Y
+	lda SAT, Y
 	ora #$60
 	jsr SECOND
 	+bcs chkinout_device_not_present