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A.N.A.L.O.G. Computing
Issue Number 69
February 1989


A.N.A.L.O.G. Computing
Issue Number 69
February 1989

Cover
Analog Computing 69 1989-02 Build a UPS-02
A.N.A.L.O.G. Computing
Issue Number 69
February 1989
Page 3

Editorial
by Clayton Walnum
Analog Computing 69 1989-02 Build a UPS-04
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Analog Computing 69 1989-02 Build a UPS-08
Analog Computing 69 1989-02 Build a UPS-09
Analog Computing 69 1989-02 Build a UPS-10
Analog Computing 69 1989-02 Build a UPS-11
A.N.A.L.O.G. Computing
Issue Number 69
February 1989
page 12

Color Set
by Jackson Beebe

Have you ever admired the colored text and screens in other peoples programs and wished you could add them to your own BASIC programs? Have you given up trying to figure out Atari SETCOLOR statements and their relationship to POKE statements? Have you spent hours trying to design screens by POKEing in one number after another, writing small notes on the backs of envelopes with a pencil that kept getting lost, only to be dissatisfied with the results at the end?

If you answered "Yes" to any of the above, then Color Set is the program for you. Color Set allows you to change the color and intensity of the screen, border or text using the arrow keys. The correct SETCOLOR and POKE statements to produce these colors are constantly updated and displayed on the screen. Experimenting and watching the results soon gives you a working knowledge of the color statements.

Color Set will run on any Atari 8-bit computer. It will produce a printed record of screens you compose or will allow you to jot down settings shown on the screen. To quit the program, hit BREAK, and then clear the screen.

Graphics Modes

The Atari 800XL has 16 graphics modes, number 0-15. Each mode has its own resolution, number of lines, number of characters per line, and number of colors available. When you turn on Atari 8-bit computers, they come up in Graphics 0, their default mode. This mode is a text mode (like 1-2) as opposed to a grpahics mode (like 3-15). This is the mode you use when you work in BASIC or with most text-oriented or utility functions. It has 40 characters per line, 24 lines per screen, and 16 colors of background or border, each with eight levels of intensity, ranging from dark to bright. The text will be the same color as the screen background, but vary in intensity against the screen. When the screen and text color are the same intensity, the text is invisible.

SETCOLOR Statements

The intensity of the text, the color and intensity of the screen, and the color and intensity of the border are controlled in Graphics 0 by three SETCOLOR statements. 

SETCOLOR 1,0,Y = Text intensity

Y can be any even number from 0-14, to change text from dark to bright.

SETCOLOR 2,X,Y = Screen color and intensity

X can vary from 0 to 15 to change the color of the screen and text, and Y can be any even number from 0-14, to change intensity of screen color from dark to bright.

SETCOLOR 4,X,Y = Border color and intensity

X and Y are the same as wehn setting the screen colors.
Analog Computing 69 1989-02 Build a UPS-13
Analog Computing 69 1989-02 Build a UPS-14
Analog Computing 69 1989-02 Build a UPS-15
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Analog Computing 69 1989-02 Build a UPS-20
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