another fix for JiffyDOS EOI detection

c64/kernal/iec/iec_rx_byte.s

@@ -124,7 +124,7 @@ iec_rx_clk_wait2:
 	// the next byte. (p11).
 	jsr iec_release_clk_pull_data
 
-	// Retreive the received byte
+	// Retrieve the received byte
 	pla
 	
 	// Restore registers

c64/kernal/iec_fast/iec_rx_byte_jiffydos.s

@@ -80,10 +80,16 @@ iec_rx_byte_jiffydos:
 	// Pull DATA at the end, cycles: 4
 	stx CIA2_PRA
 
-	// Check for EOI (DATA line)
+	// If CLK line active - success
-	bmi !+
+	bvc iec_rx_byte_jiffydos_end
+
+	// XXX does the DATA line status tell something?
 	jsr kernalstatus_EOI
-!:
+
+	// FALLTROUGH
+
+iec_rx_byte_jiffydos_end:
+
 	// Indicate that no byte waits in output buffer
 	lda #$00
 	sta C3PO