diff --git a/Makefile.mak b/Makefile.mak
index c58e8e06..f7d27575 100644
--- a/Makefile.mak
+++ b/Makefile.mak
@@ -39,7 +39,7 @@ bin\th01\fuuin.exe: bin\th01\fuuin.obj th01\fuuin_11.c th01\fuuin_13.c
 $**
 |
 
-bin\th02\op.exe: bin\th02\op.obj th02\op_03.c th02\op_04.c th02\op_05.c th02\op_06.c
+bin\th02\op.exe: bin\th02\op.obj th02\op_02.c th02\op_03.c th02\op_04.c th02\op_05.c th02\op_06.c
 	$(CC) $(CFLAGS) -ml -Z -DGAME=2 -nbin\th02\ -eOP.EXE @&&|
 $**
 |
@@ -48,3 +48,13 @@ bin\th02\maine.exe: bin\th02\maine.obj th02\maine_03.c th02\maine_04.c th02\main
 	$(CC) $(CFLAGS) -ml -3 -Z -DGAME=2 -nbin\th02\ -eMAINE.EXE @&&|
 $**
 |
+
+bin\th03\op.exe: bin\th03\op.obj th03\op_02.c
+	$(CC) $(CFLAGS) -ml -DGAME=3 -nbin\th03\ -eOP.EXE @&&|
+$**
+|
+
+bin\th04\op.exe: bin\th04\op.obj th04\op_02.c
+	$(CC) $(CFLAGS) -ml -DGAME=4 -nbin\th04\ -eOP.EXE @&&|
+$**
+|
diff --git a/th02/hardware/frame_delay_.asm b/th02/hardware/frame_delay_.asm
index 271aba7b..7d5f0da1 100644
--- a/th02/hardware/frame_delay_.asm
+++ b/th02/hardware/frame_delay_.asm
@@ -1,3 +1,4 @@
-frame_delay_	proc
+public FRAME_DELAY_2
+frame_delay_2	proc
 	frame_delay_macro
-frame_delay_	endp
+frame_delay_2	endp
diff --git a/th02/hardware/frmdely1.c b/th02/hardware/frmdely1.c
new file mode 100644
index 00000000..dfc484c8
--- /dev/null
+++ b/th02/hardware/frmdely1.c
@@ -0,0 +1,5 @@
+void pascal frame_delay(int frames)
+{
+	vsync_reset1();
+	while(vsync_Count1 < frames) {}
+}
diff --git a/th02/hardware/frmdely2.c b/th02/hardware/frmdely2.c
new file mode 100644
index 00000000..aff0b23f
--- /dev/null
+++ b/th02/hardware/frmdely2.c
@@ -0,0 +1,5 @@
+void pascal frame_delay_2(int frames)
+{
+	vsync_reset1();
+	while(vsync_Count1 < frames) {}
+}
diff --git a/th02/op_02.c b/th02/op_02.c
new file mode 100644
index 00000000..3df7ab70
--- /dev/null
+++ b/th02/op_02.c
@@ -0,0 +1,8 @@
+/* ReC98
+ * -----
+ * Code segment #2 of TH02's OP.EXE
+ */
+
+#include "th02/th02.h"
+
+#include "th02/hardware/frmdely1.c"
diff --git a/th02/th02.h b/th02/th02.h
index 8ee4b4a1..e1cb6bfc 100644
--- a/th02/th02.h
+++ b/th02/th02.h
@@ -115,6 +115,7 @@ extern input_t input;
 
 void input_sense(void);
 void pascal frame_delay(int frames);
+void pascal frame_delay_2(int frames);
 
 // Sound
 #include "libs\kaja\kaja.h"
diff --git a/th02_op.asm b/th02_op.asm
index 3bb62a11..9eabecdf 100644
--- a/th02_op.asm
+++ b/th02_op.asm
@@ -2347,14 +2347,14 @@ include th02/hardware/snd_kaja_func.asm
 		cmp	_snd_active, 0
 		jnz	short loc_B232
 		push	64h ; 'd'
-		nopcall	frame_delay_
+		nopcall	frame_delay_2
 		pop	bp
 		retf
 ; ---------------------------------------------------------------------------
 
 loc_B232:
 		push	1
-		nopcall	frame_delay_
+		nopcall	frame_delay_2
 		mov	ah, KAJA_GET_SONG_MEASURE
 		cmp	_snd_midi_active, 1
 		jz	short loc_B246
@@ -2377,7 +2377,7 @@ loc_B24B:
 ; ---------------------------------------------------------------------------
 
 include th02/hardware/snd_se.asm
-include th02/hardware/frame_delay.asm
+	extern FRAME_DELAY:proc
 op_02_TEXT	ends
 
 ; ===========================================================================
diff --git a/th03/op_02.c b/th03/op_02.c
new file mode 100644
index 00000000..d0c60dde
--- /dev/null
+++ b/th03/op_02.c
@@ -0,0 +1,8 @@
+/* ReC98
+ * -----
+ * Code segment #2 of TH02's OP.EXE
+ */
+
+#include <master.h>
+
+#include "th02/hardware/frmdely2.c"
diff --git a/th03_op.asm b/th03_op.asm
index 553e6f45..2056ea1a 100644
--- a/th03_op.asm
+++ b/th03_op.asm
@@ -2166,7 +2166,7 @@ sub_A899	proc near
 		mov	dx, 0A6h ; '¦'
 		out	dx, al
 		push	1
-		call	frame_delay_
+		call	frame_delay_2
 		pop	bp
 		retn
 sub_A899	endp
@@ -6245,8 +6245,7 @@ loc_CB7D:
 		retf
 sub_CB68	endp
 
-include th02/hardware/frame_delay_.asm
-	db 0
+	extern FRAME_DELAY_2:proc
 op_02_TEXT	ends
 
 	.data
diff --git a/th04/op_02.c b/th04/op_02.c
new file mode 100644
index 00000000..d0c60dde
--- /dev/null
+++ b/th04/op_02.c
@@ -0,0 +1,8 @@
+/* ReC98
+ * -----
+ * Code segment #2 of TH02's OP.EXE
+ */
+
+#include <master.h>
+
+#include "th02/hardware/frmdely2.c"
diff --git a/th04_op.asm b/th04_op.asm
index d33e8b1c..de16c4e5 100644
--- a/th04_op.asm
+++ b/th04_op.asm
@@ -3438,7 +3438,7 @@ sub_C244	proc near
 		mov	dx, 0A6h ; '¦'
 		out	dx, al
 		push	1
-		call	frame_delay_
+		call	frame_delay_2
 		pop	bp
 		retn
 sub_C244	endp
@@ -7492,7 +7492,7 @@ loc_E6D4:
 		retf
 sub_E6D0	endp
 
-include th02/hardware/frame_delay_.asm
+	extern FRAME_DELAY_2:proc
 
 op_02_TEXT	ends