IEC code size optimizations

c64/kernal/iec/iec_wait60us.s

@@ -1,4 +1,8 @@
 
+//
+// Note: damages .X
+//
+
 
 #if CONFIG_IEC
 
@@ -14,8 +18,8 @@ iec_wait60us:
 
 	// Waste cycles in a loop
 
-	ldy #$0A   // 2 cycles
-!:	dey        // 2 cycles * 10
+	ldx #$0A   // 2 cycles
+!:	dex        // 2 cycles * 10
 	bpl !-     // 3 cycles * 9  + 2 cycles
 	rts        // 6 cycles
 

c64/kernal/iec/load_iec.s

@@ -93,7 +93,7 @@ load_iec:
 	// Display start address
 	jsr lvs_display_loading_verifying
 
-#if CONFIG_IEC_JIFFYDOS && !CONFIG_MEMORY_MODEL_60K
+#if (CONFIG_IEC_JIFFYDOS || CONFIG_IEC_DOLPHINDOS) && !CONFIG_MEMORY_MODEL_60K
 
 	// If feasible, use JiffyDOS optimized LOAD loop