Design
The game is written mostly in compiled BASIC v1.0, with a few assembly modules linked in for graphics, sound, and keyboard support. This can be confirmed by looking at the executable.
The assembly module(s) for graphics were included largely for performance, and included rudimentary sprite support. The keyboard support received careful attention, due to negative experiences with games that dropped keystrokes.
Most of the game-play timing was based on the PC's system clock (the 18.55 Hz ticker), making it relatively independent of CPU speed.
Read more about this topic: Freddy's Rescue Roundup
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