Playing Commander Keen Episode 4 on an IBM PC
The following is footage of Commander Keen in Goodbye, Galaxy! - Episode IV - Secret of the Oracle, published by Apogee in 1992. It is not a complete playthrough, but rather just enough gameplay to serve as a reference for how the game looks and feels on the original hardware.
This footage was recorded from an IBM PC (8088 CPU running at 4.77MHz) with a ("new-style") CGA card. The audio was tapped from the PC speaker and the video was recorded from the CGA composite output. The result was post-processed from 30i to 60p; all source frames are intact. This video can be considered a reference for how this game performs on this platform.
The graphics in this particular game were designed only for RGB displays, so the composite output colors seen here are not strictly as the developer intended.
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