Beyond Castle Wolfenstein

Monitor support (IBM PC version)

The main menu lets you toggle the monitor type between RGB and composite. This setting is saved to disk but has no effect: no matter which type is selected, RGB is always used. The disk does include artwork for a composite version of the title screen -- and the game was actually programmed to check the monitor setting and load the respective title image. However the released version adds a deliberate override, which ignores your choice and always shows the RGB artwork.

To re-enable this (partial?) composite monitor support, you can edit the disk's boot sector and change the two bytes at offset 56h from B5 20 to 90 90. This NOPs out the override, and loads the appropriate title screen if set to composite (see screenshots page). The rest of the game, including the victory image, will still use the same graphics data for both monitor types.

(Also: for whatever reason, the composite title screen tells you to press RETURN while the RGB version calls it ENTER.)