BASIC Programming: Difference between revisions

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{{About|the Atari 2600 cartridge|programming in other BASICsBASIC dialects|BASIC|other uses|Basic programming (disambiguation){{!}}Basic programming}}

{{refimprovemore citations needed|date=October 2017}}

{{Use dmy dates|date=July 2017}}

{{refimprove|date=October 2017}}

{{Infobox video game

|title = BasicBASIC Programming

|image = BasicprogrammingBASIC Programming Cover Art.pngjpg

|developer = [[Atari, Inc.]]

|publisher = Atari, Inc.

|developerdesigner = [[Warren Robinett]]<ref>[httphttps://www.dadgum.com/halcyon/BOOK/ROBINETT.HTM Interview:Warren Robinett], By James Hague, ''Halcyon Days, '', "How long did it take to write?...I had "''Adventure"'' sort of done in the fall of 1978, but I wasn't satisfied. I sort of put it on the shelf for the next six months while I did the "''BASIC Programming"'' cartridge, and finished them both simultaneously, in June 1979.''"</ref>

|publisher = Atari

|released = {{vgrelease|NA|April 1980<ref>{{cite web |title=Atari VCS game release dates |url=https://www.atariarchive.org/atari-vcs-game-release-dates/ |website=Atari Archive}}</ref>}}

|designer = [[Warren Robinett]]

|released = 1979

|platforms = [[Atari 2600]]

}}

'''''BASIC Programming''''' (Model#is CX2620)an attemptedAtari toVideo teachComputer simpleSystem computer(later programming oncalled the [[Atari 2600]].) Itcartridge wasthat releasedteaches insimple 1979,computer andprogramming itusing wasa onedialect of only[[BASIC]]. aWritten fewby non-gaming[[Warren cartridgesRobinett]] everand designedreleased forby the[[Atari, 2600Inc.]] Thein programming1980, languagethis was[[BASIC superficiallyinterpreter]] similaris to dialectsone of [[BASIC]],a butfew differednon-game incartridges manyfor importantthe aspectsconsole. The extremelyAtari smallVCS's [[Random-access memory|RAM]] size of the Atari 2600, 128 bytes, severely restrictedrestricts the possibilities of this cartridge for writing programs.

==Details==

[[File:Basicprogramming.png|thumb|upright=2|Main display]]

The BASIC Programming display was divided into six regions:

The ''BASIC Programming'' display wasis divided into six regions:

* '''Program''' where instructions are written (maximum of nine (or eleven) lines of code).

* [[Call stack|Stack]] shows temporary results of what your program does.

* [[Variable (computer science)|Variables]] displays the values of any variables your program is using.

* '''Output''' displays any output values your program is creating.

* '''Status''' displays the amount of available memory remaining

* '''Graphics''' contains two colored squares that can be manipulated by your program.

* '''Program''' is where instructions are writtentyped. (maximumIt ofhas ninea (ormaximum of eleven) lines of code).

Input is given through two Atari keypad controllers, which came with special overlays to show how to type the different commands and letters.<ref>[https://atariage.com/controller_page.html?ControllerID=4&SystemID=2600 Controllers - Atari Keypad], Atari KeypadSystem: Atari 2600, Model Number: CX50, ''Sold in pairs, functionally identical to the Kid's Controller and the Video Touch Pad. Included overlays with commands, meant to be used with Basic Programming.''</ref> Programs were restricted to 64 characters in size and 9 lines of code, severely limiting the programs that could be written. Users could disable all windows except Program and keep selecting "New Line" until over nine empty lines had been entered and thus their program could use 11 lines of code using this trick.

* '''[[Call stack|Stack]]''' shows temporary results of what yourthe program does.

* '''[[Variable (computer science)|Variables]]''' displaysstores the values of any variables yourthat the program is using.

* '''Output''' displays any output values yourthat programthe isprogram creatingcreates.

* '''Status''' displaysshows the amount of available memory remaining.

* '''Graphics''' contains two colored squares that can be manipulated by yourthe program.

Input is given through two Atari keypad controllers, which came with special overlays to show how to type the different commands and letters.<ref>[https://atariage.com/controller_page.html?ControllerID=4&SystemID=2600 Controllers - Atari Keypad], {{Webarchive|url=https://web.archive.org/web/20150615042830/https://atariage.com/controller_page.html?ControllerID=4&SystemID=2600 |date=15 June 2015 }} Atari KeypadSystem: Atari 2600, Model Number: CX50, ''Sold in pairs, functionally identical to the Kid's Controller and the Video Touch Pad. Included overlays with commands, meant to be used with Basic Programming.''</ref> Programs wereare restricted to 64 characters in size and normally 9 lines of code, severely limiting the programs that couldcan be written. Users(users couldcan disable all windows except Program and keep selecting "New Line" until over nine empty lines had been entered and thus their program could use 11 lines of code using thisare trickpresent).

===Language features===

VCS BASIC supports the following keywords:<ref>{{cite book|title=BASIC Programming: Atari Game Program Instructions|date=1979|publisher=Atari, Inc.|___location=Sunnyvale, CA}}</ref>

* Statements: <code>Print</code>

* Structure: <code>Goto</code>, <code>If-Then-Else</code>

* Graphics: <code>Clear</code>

* Functions: <code>Hit</code>, <code>Key</code>

* Math: <code>+ - × ÷ Mod</code>

* Relational operators: <code>< > =</code>

Unlike most BASIC implementations of the time:

* VCS BASIC uses ← instead of = for assignment; e.g., <code>A←A+1</code>.

* Statements can be strung together on a line without a delimiter; e.g., <code>Note←APrintA</code>.

* An <code>If</code> statement can be used as a function, returning a value: <code>{{codett|2=cbmbas|Ver1←Ver1+IfVer1}}[[Modulo operation|Mod]]2{{codett|2=cbmbas|Then8}}{{codett|2=monkey|Else}}92</code>

* <code>If</code> statements can take an <code>Else</code> clause.

Special variable names:

* <code>Note</code> sounds a musical note, assigned numbers from 0 to 7

** Numbers assigned to <code>Note</code> are implicitly assigned modulus 8, thus 8 becomes 0, 9 becomes 1, etc.

* <code>Hor1</code>, <code>Hor2</code> - the horizontal coordinate of one of two squares

* <code>Ver1</code>, <code>Ver2</code> - the vertical coordinate of one of two squares

The language supports 26 unsigned integer variables A to Z. VCS BASIC supports integers from 0 to 99. Math operations wrap, so 99+1 becomes 0, 99+2 becomes 1, etc.

====Sample code====

The following example of a ''[[Pong]]'' game is provided.

{{pre|

1 Hor2←2+Key

2 {{codett|2=cbmbas|IfVer1>90ThenVer1←88}}

3 {{codett|2=cbmbas|IfHit}}{{codett|2=cbmbas|ThenVer1←9}}

4 {{codett|2=cbmbas|Ver1←Ver1+IfVer1}}[[Modulo operation|Mod]]2{{codett|2=cbmbas|Then8}}{{codett|2=monkey|Else}}92

5 Hor1←Hor1+7

6 {{codett|2=cbmbas|Goto1}}

}}

==See also==

{{Portal|Video games}}

* [[CompuMate|Spectravideo CompuMate]] Basic Keyboard Enhancer - Atari 2600 cartridge

*[[List of Atari 2600 games]]

* [[CompuMate|Spectravideo CompuMate]] Basic Keyboard Enhancer - Atari 2600 cartridge

* [[Family BASIC]]

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==External links==

* {{webarchive |url=https://web.archive.org/web/20040123023347/http://www.mindspring.com/~sidartha/Basic%20and%20Compumate%20Programming.htm |date=23 January 23, 2004 |title=Compumate FAQ:BASIC PROGRAMME EXAMPLES FOR ATARI 2600 (BASIC PROGRAMMING & CompuMate). AUTHOR: Graham.J.Percy, Version 1.0, 25 September 1998. }}

*''[http://www.atariage.com/software_page.html?SoftwareLabelID=15 Basic Programming]'' at [[AtariAge]]

*{{webarchive |url=https://web.archive.org/web/20040123023347/http://www.mindspring.com/~sidartha/Basic%20and%20Compumate%20Programming.htm |date=January 23, 2004 |title=Compumate FAQ:BASIC PROGRAMME EXAMPLES FOR ATARI 2600 (BASIC PROGRAMMING & CompuMate). AUTHOR: Graham.J.Percy, Version 1.0, 25 September 1998. }}

{{BASIC}}

[[Category:19791980 video gamessoftware]]

[[Category:Atari games2600]]

[[Category:AtariBASIC 2600 gamesinterpreters]]

[[Category:ProgrammingBASIC gamesprogramming language family]]

[[Category:VideoDiscontinued games developed in the United StatesBASICs]]

[[Category:Video game development software]]

{{edu-videogame-stub}}