diff --git a/plugins/cpu/z80-cpu/src/main/java/net/emustudio/plugins/cpu/zilogZ80/EmulatorEngine.java b/plugins/cpu/z80-cpu/src/main/java/net/emustudio/plugins/cpu/zilogZ80/EmulatorEngine.java
index 0830c5d99..fcea0966f 100644
--- a/plugins/cpu/z80-cpu/src/main/java/net/emustudio/plugins/cpu/zilogZ80/EmulatorEngine.java
+++ b/plugins/cpu/z80-cpu/src/main/java/net/emustudio/plugins/cpu/zilogZ80/EmulatorEngine.java
@@ -420,7 +420,7 @@ private void writeWord(int address, int value) {
     }
 
     private void incrementR() {
-        R = (R & 0x80) | (((R & 0x7F) + 1) & 0x7F);
+        R = (R & 0x80) | ((R + 1) & 0x7F);
     }
 
     void I_NOP() {
@@ -910,9 +910,9 @@ void I_PUSH_IX() {
     void I_PUSH_IY() {
         // pc:5,sp-1:3,sp-2:3
         SP = (SP - 2) & 0xFFFF;
-        memory.write((SP + 1) & 0xFFFF, (byte) (IY & 0xFF));
+        memory.write((SP + 1) & 0xFFFF, (byte) (IY >>> 8));
         advanceCycles(3);
-        memory.write(SP, (byte) (IY >>> 8));
+        memory.write(SP, (byte) (IY & 0xFF));
         advanceCycles(3);
     }
 
diff --git a/plugins/device/cassette-player/src/main/java/net/emustudio/plugins/device/cassette_player/loaders/TzxLoader.java b/plugins/device/cassette-player/src/main/java/net/emustudio/plugins/device/cassette_player/loaders/TzxLoader.java
index 351ea6fe3..fda5aa436 100644
--- a/plugins/device/cassette-player/src/main/java/net/emustudio/plugins/device/cassette_player/loaders/TzxLoader.java
+++ b/plugins/device/cassette-player/src/main/java/net/emustudio/plugins/device/cassette_player/loaders/TzxLoader.java
@@ -72,7 +72,6 @@ private void interpret(byte[] content, TapePlayback listener) throws IOException
 
         while (buffer.position() < buffer.limit()) {
             int id = buffer.get() & 0xFF; // 16 for ROM-saved block
-            System.out.println(id);
 
             int pause = buffer.getShort() & 0xFFFF; // pause after this block
             int blockLength = buffer.getShort() & 0xFFFF;