My first TSR (that I let other people get their hands on) decremented the clock counter twice per tick. That meant that the Windows 3 screensaver clock appeared to run backwards. This was very clever, to my juvenile brain.
Back in those days the viruses were so innocent. Like playing a tune every day at 5 o'clock or flashing red frame around the screen once in a while. Not like ransomware of today :-[
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