diff --git a/c64/basic/basic_commands_CD/cmd_fast.s b/c64/basic/basic_commands_CD/cmd_fast.s
deleted file mode 100644
index 913ca187..00000000
--- a/c64/basic/basic_commands_CD/cmd_fast.s
+++ /dev/null
@@ -1,41 +0,0 @@
-// #LAYOUT# STD *       #TAKE
-// #LAYOUT# *   BASIC_0 #TAKE
-// #LAYOUT# *   *       #IGNORE
-
-
-cmd_fast:
-
-#if CONFIG_MB_MEGA_65
-
-	// Command implementation for Mega65
-
-	lda #$41
-	sta CPU_D6510
-
-	jmp execute_statements
-
-#elif CONFIG_MB_ULTIMATE_64
-
-	// Try to enable turbo in SuperCPU compatible way
-	sta SCPU_SPEED_TURBO
-
-	jmp execute_statements
-
-#elif CONFIG_PLATFORM_COMMODORE_64
-
-	// Command implementation for generic C64 platform
-
-	// Try to enable turbo mode in C128 compatible way
-	lda #$01
-	sta VIC_CLKRATE
-
-	// Try to enable turbo in SuperCPU compatible way
-	sta SCPU_SPEED_TURBO
-
-	jmp execute_statements
-
-#else
-
-	jmp do_NOT_IMPLEMENTED_error
-
-#endif
diff --git a/c64/basic/basic_commands_CD/cmd_fast_slow.s b/c64/basic/basic_commands_CD/cmd_fast_slow.s
new file mode 100644
index 00000000..79fcb6ae
--- /dev/null
+++ b/c64/basic/basic_commands_CD/cmd_fast_slow.s
@@ -0,0 +1,78 @@
+// #LAYOUT# STD *       #TAKE
+// #LAYOUT# *   BASIC_0 #TAKE
+// #LAYOUT# *   *       #IGNORE
+
+
+#if CONFIG_MB_MEGA_65
+
+	// Command implementation for Mega65
+
+	// XXX - I think there are some bit-set instructions in 65CE02...
+
+cmd_slow:
+
+	lda #$40
+	skip_2_bytes_trash_nvz
+
+	// FALLTROUGH
+
+cmd_fast:
+
+	lda #$41
+	sta CPU_D6510
+
+	jmp execute_statements
+
+#elif CONFIG_MB_ULTIMATE_64
+
+	// Command implementation for Ultimate 64 - SuperCPU compatible way should be enough
+
+cmd_slow:
+
+	sta SCPU_SPEED_NORMAL
+	jmp execute_statements
+
+cmd_fast:
+
+	sta SCPU_SPEED_TURBO
+	jmp execute_statements
+
+#elif CONFIG_PLATFORM_COMMODORE_64
+
+	// Command implementation for generic C64 platform
+
+cmd_slow:
+
+	// Try to disable turbo in SuperCPU compatible way
+	sta SCPU_SPEED_NORMAL
+
+	// Try to disable turbo mode in C128 compatible way
+
+	lda #$00
+	beq !+                                       // branch always
+
+cmd_fast:
+
+	// Try to enable turbo in SuperCPU compatible way
+	sta SCPU_SPEED_TURBO
+
+	// Try to enable turbo mode in C128 compatible way
+	lda #$01
+!:
+	sta VIC_CLKRATE
+
+	jmp execute_statements
+
+#else
+
+cmd_slow:
+
+	nop                                          // to prevent double label
+
+	// FALLTROUGH
+
+cmd_fast:
+
+	jmp do_NOT_IMPLEMENTED_error
+
+#endif
diff --git a/c64/basic/basic_commands_CD/cmd_slow.s b/c64/basic/basic_commands_CD/cmd_slow.s
deleted file mode 100644
index cae5e5d6..00000000
--- a/c64/basic/basic_commands_CD/cmd_slow.s
+++ /dev/null
@@ -1,44 +0,0 @@
-// #LAYOUT# STD *       #TAKE
-// #LAYOUT# *   BASIC_0 #TAKE
-// #LAYOUT# *   *       #IGNORE
-
-
-cmd_slow:
-
-#if CONFIG_MB_MEGA_65
-
-	// Command implementation for Mega65
-
-	lda #$40
-	sta CPU_D6510
-
-	jmp execute_statements
-
-#elif CONFIG_MB_ULTIMATE_64
-
-	// Command implementation for Ultimate 64
-
-	// Try to disable turbo in SuperCPU compatible way
-	sta SCPU_SPEED_NORMAL
-
-	jmp execute_statements
-
-#elif CONFIG_PLATFORM_COMMODORE_64
-
-	// Command implementation for generic C64 platform
-
-	// Try to disable turbo mode in C128 compatible way
-
-	lda #$00
-	sta VIC_CLKRATE
-
-	// Try to disable turbo in SuperCPU compatible way
-	sta SCPU_SPEED_NORMAL
-
-	jmp execute_statements
-
-#else
-
-	jmp do_NOT_IMPLEMENTED_error
-
-#endif