diff --git a/README-OS4.md b/README-OS4.md
new file mode 100644
index 0000000..a051cd8
--- /dev/null
+++ b/README-OS4.md
@@ -0,0 +1,50 @@
+# The Battle for the Solar System : The Pandoran War
+
+This is the port of the "The Battle for the Solar System : The Pandoran War" 
+v1.50.1 for the AmigaOS 4. 
+
+The Pandoran War is a 2D mission-based space shooter based on the BATTLE FOR 
+THE SOLAR SYSTEM space opera and set between books two and three: THE THIRD 
+SIDE and THE ATTTRIBUTE OF THE STRONG. The game features many missions, 
+with many different objectives and craft.
+
+It requires a fast system to play the game as fast as possible, and a 
+graphics card that supports either opengl/opengles2 with SDL2.
+It is tested and runs well on X5000/40 with a RadeonRX 550. 
+
+This archive does not contain any data files. In order to play the game, you 
+need to download the data  separately. From the following website download
+the "tbftss-1.5.1.linux-x86_64.tar.gz" file.
+
+https://www.battleforthesolarsystem.com/games/pw/#downloads
+
+To install it, extract the data file anywhere at you hard disk
+and copy over all the files from this archive. A requester will show up
+to replace some files, which you need to confirm for all of them.
+
+If you like the game and would like to support its developer, you can go and
+buy it at:
+https://parallelrealities.itch.io/tbftss-the-pandoran-war
+
+### How to make it faster
+
+The game should run in 60fps but on my test system I get around 30fps with all 
+the effects enabled. That's why I introduced an option at the Options screen, 
+named "Effects Reduction" with values from 0 to 3. With 0 you have full effects
+everywhere, and with 3 you have less effects shown. That increases a lot the 
+speed, but you might still see slowdowns in situations where there is a lot of 
+action on the screen.
+
+It is recommended to open the SDL2 prefs and set the Driver to opengl/opengl2 
+depending your gfx card and the drivers you have installed.
+
+On my system "Batching Mode: enabled" leads to some crashes. I recommend you 
+to  set this to default. But feel free to experiment with it, in case it
+works better for you.
+
+I'd love to hear how it works on your system.
+ 
+### Changelog
+1.50.1r1 (2022-08-22)
+* First release
+
diff --git a/icons/tbftss.info b/icons/tbftss.info
new file mode 100644
index 0000000..98bc0dc
Binary files /dev/null and b/icons/tbftss.info differ
diff --git a/makefile.os4 b/makefile.os4
index 478a25f..e4c34f9 100644
--- a/makefile.os4
+++ b/makefile.os4
@@ -34,45 +34,20 @@ LDFLAGS += -lSDL2 -lpthread -athread=native -lstdc++
 $(PROG): $(OBJS)
 	$(CC) -o $@ $(OBJS) $(LDFLAGS)
 
-install:
-	mkdir -p $(INST_BIN_DIR)
-	install -m 0755 $(PROG) $(INST_BIN_DIR)
-	mkdir -p $(INST_DATA_DIR)
-	cp -r data $(INST_DATA_DIR)
-	cp -r gfx $(INST_DATA_DIR)
-	cp -r manual $(INST_DATA_DIR)
-	cp -r music $(INST_DATA_DIR)
-	cp -r sound $(INST_DATA_DIR)
-	mkdir -p $(INST_ICON_DIR)/16x16/apps
-	mkdir -p $(INST_ICON_DIR)/32x32/apps
-	mkdir -p $(INST_ICON_DIR)/64x64/apps
-	mkdir -p $(INST_ICON_DIR)/128x128/apps
-	cp -p icons/$(PROG)-16x16.png $(INST_ICON_DIR)/16x16/apps/$(PROG).png
-	cp -p icons/$(PROG)-32x32.png $(INST_ICON_DIR)/32x32/apps/$(PROG).png
-	cp -p icons/$(PROG)-64x64.png $(INST_ICON_DIR)/64x64/apps/$(PROG).png
-	cp -p icons/$(PROG)-128x128.png $(INST_ICON_DIR)/128x128/apps/$(PROG).png
-	mkdir -p $(INST_DESKTOP_DIR)
-	cp -p icons/$(PROG).desktop $(INST_DESKTOP_DIR)
+# prepare an archive for the program
+dist:
+	mkdir -p release/$(PROG)-$(VERSION).$(REVISION)/data/app
+	mkdir -p release/$(PROG)-$(VERSION).$(REVISION)/data/widgets
+	cp $(PROG) release/$(PROG)-$(VERSION).$(REVISION)/
+	strip release/$(PROG)-$(VERSION).$(REVISION)/$(PROG)
+	cp icons/tbftss.info release/$(PROG)-$(VERSION).$(REVISION)/$(PROG).info
+	cp data/app/config.json release/$(PROG)-$(VERSION).$(REVISION)/data/app/
+	cp data/widgets/options.json release/$(PROG)-$(VERSION).$(REVISION)/data/widgets/
+	cp LICENSE release/$(PROG)-$(VERSION).$(REVISION)/
+	cp README.md release/$(PROG)-$(VERSION).$(REVISION)/
+	cp README-OS4.md release/$(PROG)-$(VERSION).$(REVISION)/
+	lha -aeqr3 a $(PROG)-$(VERSION).$(REVISION).lha release/
 
-	@for f in $(LOCALE_MO); do \
-		lang=`echo $$f | sed -e 's/^locale\///;s/\.mo$$//'`; \
-		mkdir -p $(INST_LOCALE_DIR)/$$lang/LC_MESSAGES; \
-		cp -v $$f $(INST_LOCALE_DIR)/$$lang/LC_MESSAGES/$(PROG).mo; \
-	done
-
-uninstall:
-	$(RM) $(BIN_DIR)/$(PROG)
-	$(RM) -rf $(DATA_DIR)
-	$(RM) $(ICON_DIR)/16x16/apps/$(PROG).png
-	$(RM) $(ICON_DIR)/32x32/apps/$(PROG).png
-	$(RM) $(ICON_DIR)/64x64/apps/$(PROG).png
-	$(RM) $(ICON_DIR)/128x128/apps/$(PROG).png
-	$(RM) $(DESKTOP_DIR)/$(PROG).desktop
-
-	@for f in $(LOCALE_MO); do \
-		lang=`echo $$f | sed -e 's/^locale\///;s/\.mo$$//'`; \
-		$(RM) -v $(LOCALE_DIR)/$$lang/LC_MESSAGES/$(PROG).mo; \
-	done
 
 .PHONY: dist
 
diff --git a/src/battle/effects.c b/src/battle/effects.c
index 053210a..f540edc 100644
--- a/src/battle/effects.c
+++ b/src/battle/effects.c
@@ -702,7 +702,7 @@ static float calculateEffectsValue(unsigned int val)
 	#if defined(__amigaos4__)
 	if (app.effects)
 	{
-		return val>>(app.effects<<1);
+		return val / (app.effects * 2);
 	}
 	#endif
 	
diff --git a/src/game/options.c b/src/game/options.c
index 8fb776e..8f2fd59 100644
--- a/src/game/options.c
+++ b/src/game/options.c
@@ -121,9 +121,11 @@ static void drawMain(void)
 	drawWidgets("options");
 
 	app.textWidth = r.w - 100;
-
+	
+	#if !defined(__amigaos4__)
 	drawText(UI_WIDTH / 2, r.y + r.h - 135, 16, TA_CENTER, colors.yellow, RESOLUTION_TEXT);
-
+	#endif
+	
 	app.textWidth = 0;
 
 	SDL_SetRenderTarget(app.renderer, app.backBuffer);