!!!Atari Biorhythm CX4107 ; Copyright (C) 1980 Atari, Inc.
The 'Biorhythm' theory states that human lives move in predictable wavelike patterns involving three separate cycles:\\
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 (A) Physical      23 days\\
 (B) Emotional     28 days\\
 (C) Intellectual  33 days\\
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There are three major areas to this chart to be observed:\\
 **__LOW__** **__CRITICAL__** **__PEAK__**\\
\\
 **__CRITICAL__**\\
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The day that the cycle switches from peak to low or low to peak is a critical day. It is defined as critical because you are neither up or down, but in a neutral state.\\
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(A) Physical cycle: People tend to be accident prone.\\
(B) Emotional cycle: Emotional outbursts are possible.\\
(C) Intellectual cycle: Not as important by itself. It does coincide with the other two cycles and has a contributary effect.\\
\\
 **__PEAK__**\\
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(A) During the 11-1/2 peak days, is a good time for intensive training in athletics or for any activity requiring physical stamina.\\
(B) During the 14 peak days, both men and women are prone to cheerfulness, cooperation, and a positive outlook on life.\\
(C) During the 16-1/2 peak days of this cycle, a person finds it easier to study, write creatively understand mathematics or pursue any intellectual efforts.\\
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 **__LOW__**\\
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(A) During the 16-1/2 low days, people are aware of a reduced vitality and endurance. In short, you will tire easily on these days.\\
(B) During the 14 low days, people have tendencies toward moodiness and negativism.\\
(C) During the 11-1/2 low days, capacities are lessened. These are days better spent in review or practice.\\
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The biorhythm can be printed on the screen, printer or both. You select an option at this time. Only numeric entries can be entered.\\
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(1) Enter your name. If full name is more than 15 characters, then enter only first name.\\
(2) Enter your birthdate. Format of MM/DD/YY.\\
(3) Enter the range of the printout. Format of MM/DD/YY to MM/DD/YY. The two dates must be in the same year and the first earlier than the second date.\\
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After entry the biorhythm will proceed to printout. Use CONTROL 1 to halt printout:\\
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20 characters on the screen\\
40 characters on the printer
!!Manual
* [Atari Biorhythm CX4107.pdf] ; size: 1.3 MB ; thanks to Atarimania for the JPG-scans. :-)))
!!CAS-Images
* [Biorhythm (8K) without limit.cas] ; patched version without the Y2K-bug; __The German 8K-version is still missing, please help us. Thank you in advance.__
* [Biorhythm (16K) < 2000.cas] ; version with the Y2K-bug, limited up to the year 2000
!!ATR-Images
* [Atari Biorhythmus CX4107 (>= XL, english, no limit, no BASIC).atr] ; compiled Turbo-Basic XL version
* [Atari Biorhythmus CX4107 und DXG 5727 (deutsch-englisch) (Basic) komplett.atr] ; English and German version
!!Pictures
[{Image src='biorythm.jpg' width=460 height=480 }]
Atari Biorhythm CX4107 - box ; thanks to rhod for scanning\\
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[{Image src='Program1.gif' width=336 height=240 }]
Atari Biorhythm CX4107 - loadscreen\\
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[{Image src='Program2.gif' width=336 height=240 }]
Atari Biorhythm CX4107 - startscreen

!!References
AtariWiki highly recommends Wade's site regarding [Biorhythm|https://inverseatascii.info/2016/05/31/s2e17-atari-biorhythm-supplement/]