configuration tweaks and documentation updates

c64/kernal/iec_fast/iec_rx_byte_jiffydos.s

@@ -82,8 +82,8 @@ iec_rx_byte_jiffydos:
 
 	// If CLK line active - success
 	bvc iec_rx_byte_jiffydos_end
+	// XXX the DATA line can probably be used to distinguish between file not found error and normal stream EOI
 
-	// XXX does the DATA line status tell something?
 	jsr kernalstatus_EOI
 
 	// FALLTROUGH

c64/kernal/iec_fast/jiffydos_bittable.s

@@ -1,6 +1,6 @@
 
 //
-// Helper table for encoding lower nibble for JiffyyDOS,
+// Helper table for encoding lower nibble for JiffyDOS,
 // values found by observing the actual transfer using
 // original ROMs
 //

c64/kernal/iec_fast/jiffydos_detect.s

@@ -8,7 +8,7 @@
 // - https://github.com/rkrajnc/sd2iec/blob/master/src/iec.c
 // The 'iec.s' suggests, that the drive should respond by pulling data
 
-// The original JiffyyDOS ROM seems to perform detection with every command
+// The original JiffyDOS ROM seems to perform detection with every command
 // (even though for many of them it always fails) and we have to replicate
 // this behaviour for compatibility with at least 1541 JiffyDOS ROM