commented-out some dead code, improved ATN handling

c64/kernal/errors.s

@@ -63,17 +63,19 @@ kernalstatus_reset:
 	sta IOSTATUS
 	rts
 
-kernalstatus_TIMEOUT_WRITE: // XXX detect this!
+// The following two statuses are currentl not implemented - and most likely not really needed
-	lda IOSTATUS
-	ora #K_STS_TIMEOUT_WRITE
-	sta IOSTATUS
-	rts
 
-kernalstatus_TIMEOUT_READ: // XXX detect this!
+// kernalstatus_TIMEOUT_WRITE:
-	lda IOSTATUS
+//	lda IOSTATUS
-	ora #K_STS_TIMEOUT_READ
+//	ora #K_STS_TIMEOUT_WRITE
-	sta IOSTATUS
+//	sta IOSTATUS
-	rts
+//	rts
+
+// kernalstatus_TIMEOUT_READ:
+//	lda IOSTATUS
+//	ora #K_STS_TIMEOUT_READ
+//	sta IOSTATUS
+//	rts
 
 kernalstatus_EOI:
 	lda IOSTATUS

c64/kernal/iec_fast/iec_tx_byte_jiffydos.s

@@ -20,6 +20,9 @@ iec_tx_byte_jiffydos:
 	phx_trash_a
 	phy_trash_a
 
+	// Make sure we are not sending data on ATN
+	jsr iec_release_atn
+
 	// Store previous sprite status on stack
 	jsr jiffydos_prepare
 	pha
@@ -45,7 +48,7 @@ iec_tx_byte_jiffydos:
 
 	// Notify device that we are going to send byte by releasing everything
 	stx CIA2_PRA                       // cycles: 4
-
+	
 	// Send high nibble; cycles: 4 + 3 + 4 + 2 + 2 + 2 + 3 + 4 = 24
 	pla                                // retrieve high nibble from stack
 	ora C3PO                           // restore VIC-II and RS-232 bits
@@ -96,7 +99,7 @@ iec_tx_byte_jiffydos_finalize:
 
 iec_tx_byte_jiffydos_wait_eoi:
 
-	jsr iec_wait20us // XXX is it enough?
+	jsr iec_wait60us // XXX is it enough?
 	lda C3PO
 	jmp iec_tx_byte_jiffydos_finalize