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https://github.com/nanochess/bootBASIC

bootBASIC is a BASIC language in 512 bytes of x86 machine code.
https://github.com/nanochess/bootBASIC

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bootBASIC is a BASIC language in 512 bytes of x86 machine code.

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bootBASIC interpreter in 512 bytes (boot sector or COM file)

by Oscar Toledo G. Jul/22/2019



http://nanochess.org

https://github.com/nanochess



This is an integer BASIC language interpreter.



It's compatible with the 8088 processor (the original IBM PC). 



If you want to assemble it, you must download the Netwide Assembler

(nasm) from www.nasm.us



Use this command line:



  nasm -f bin basic.asm -Dcom_file=1 -o basic.com

  nasm -f bin basic.asm -Dcom_file=0 -o basic.img



Tested with VirtualBox for Mac OS X running Windows XP running this

interpreter, it also works with DosBox and probably with qemu:



  qemu-system-x86_64 -fda basic.img



Enjoy it!



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| |_| (_- -_) '_|/(_-< | |\/| / _` | ' \ || / _` | |

 \___//__/\___|_|   /__/ |_|  |_\__,_|_||_\_,_\__,_|_|



        

Line entry is done with keyboard, finish the line with Enter.

Only 19 characters per line as maximum.

        

Backspace can be used, don't be fooled by the fact

that screen isn't deleted (it's all right in the buffer).

        

All statements must be in lowercase.



Line numbers can be 1 to 999.



26 variables are available (a-z)



Numbers (0-65535) can be entered and display as unsigned.

       

To enter new program lines:

  10 print "Hello, world!"

        

To erase program lines:

  10

        

To test statements directly (interactive syntax):

  print "Hello, world!"

        

To erase the current program:

  new

        

To run the current program:

  run

        

To list the current program:

  list

        

To exit to command-line:

  system

        

Statements:

  var=expr        Assign expr value to var (a-z)

        

  print expr      Print expression value, new line

  print expr;     Print expression value, continue

  print "hello"   Print string, new line

  print "hello";  Print string, continue

        

  input var       Input value into variable (a-z)

        

  goto expr       Goto to indicated line in program

        

  if expr1 goto expr2

              If expr1 is non-zero then go to line,

              else go to following line.

        

Examples of if:

        

  if c-5 goto 20  If c isn't 5, go to line 20

        

Expressions:

        

  The operators +, -, / and * are available with

  common precedence rules and signed operation.

  Integer-only arithmetic.

        

  You can also use parentheses:

        

     5+6*(10/2)

        

  Variables and numbers can be used in expressions.



  The rnd function (without arguments) returns a

  value between 0 and 255.

        

Sample program (counting 1 to 10):

        

10 a=1

20 print a

30 a=a+1

40 if a-11 goto 20

        

Sample program (Pascal's triangle, each number is the sum

of the two over it):

        

10 input n

20 i=1

30 c=1

40 j=0

50 t=n-i

60 if j-t goto 80

70 goto 110

80 print " ";

90 j=j+1

100 goto 50

110 k=1

120 if k-i-1 goto 140

130 goto 190

140 print c;

150 c=c*(i-k)/k

160 print " ";

170 k=k+1

180 goto 120

190 print

200 i=i+1

210 if i-n-1 goto 30



Sample program of guessing the dice:



10 print "choose ";

20 print "a number ";

30 print "(1-6)"

40 input a

50 b=rnd

60 b=b-b/6*6

70 b=b+1

80 if a-b goto 110

90 print "good"

100 goto 120

110 print "miss"

120 print b



>> LINKS <<



Taisuke Fukuno made a 64-bit version of bootBASIC for

Mac OS X, a small article about it is available at:



    https://fukuno.jig.jp/2853



  Source code:

    https://github.com/taisukef/bootBASIC_64bit



dlinyj has created a fork of bootBASIC that can run from

the ROM of a network card. It is available here:

  

    https://github.com/dlinyj/bootBASIC



>> ATTENTION <<        



Do you would like more details on the inner workings? This program

is fully commented in my new book Programming Boot Sector Games

and you'll also find a 8086/8088 crash course!



Now available from Lulu:



  Soft-cover

    http://www.lulu.com/shop/oscar-toledo-gutierrez/programming-boot-sector-games/paperback/product-24188564.html



  Hard-cover

    http://www.lulu.com/shop/oscar-toledo-gutierrez/programming-boot-sector-games/hardcover/product-24188530.html



  eBook

    https://nanochess.org/store.html



These are some of the example programs documented profusely

in the book:



  * Guess the number.

  * Tic-Tac-Toe game.

  * Text graphics.

  * Mandelbrot set.

  * F-Bird game.

  * Invaders game.

  * Pillman game.

  * Toledo Atomchess.

  * bootBASIC language.