BBC BASIC

BBC BASIC
Sample Code
	REM Acorn Archimedes version; ON ERROR : ON ERROR OFF : PRINT REPORT$; " at line ";ERL : END; MODE MODE : REM clears the screen; PROC_triangle(700,700,500,200,500,900,"F"); END; ; DEF PROC_triangle(x1%,y1%,x2%,y2%,x3%,y3%,fill$); LOCAL triangle_fill_plot_code%; triangle_fill_plot_code% = &55; MOVE x1%,y1%; DRAW x2%,y2%; IF fill$="F" THEN; PLOT triangle_fill_plot_code%,x3%,y3%; ELSE; DRAW x3%,y3% : DRAW x1%,y1%; ENDIF; ENDPROC : REM of PROC_triangle();
Developer	Acorn Computers Ltd
First appeared	1981
Platform	BBC Microcomputer (6502); Acorn Archimedes (ARM); Acorn RISC PC (ARM / StrongARM)
OS	Acorn 6502 MOS; Acorn RISC OS
Influenced
	3rd Party ports to MS Windows; Continuing ARM support by 3rd Parties

BBC BASIC is an interpreted version of the BASIC programming language. It was developed by Acorn Computers Ltd when they were selected by the BBC to supply the computer for their BBC Literacy Project in 1981.

It was originally supplied on an installed ROM for the BBC Microcomputer which used a 6502 microprocessor. When Acorn produced the Archimedes computer which used their ARM processor, further versions of BBC BASIC were produced. Acorn included a built in assembler, first for the 6502 and later for the ARM2 processor.

Initially the BBC specified compatibility with Microsoft BASIC. Acorn were already extending their earlier Atom BASIC to include structured programming constructs. Particularly on the later Archimedes computers as the memory constraints reduced, BBC BASIC incorporated a more complete set of structured programming constructs commonly found in the ALGOL 60 group of computer languages.

Alongside Acorn's version of BBC BASIC on the Archimedes, third party companies produced compiled versions of the language. Development and support has continued after the demise of Acorn Computers Ltd for newer ARM based computers. BBC BASIC is now available on other platforms either for emulators such as on MS Windows or natively.

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