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documentations:basic_keywords [2015/03/14 09:04]
pulkomandy [Lines]
documentations:basic_keywords [2015/03/15 07:41]
pulkomandy
Line 1: Line 1:
-====== BASIC file format ====== +  
- +====== Keyword list ======
-===== Header ===== +
- +
-BASIC sources aren't stored in plain ASCII. To allow faster loading and parsing, they are stored in bytecode format. The file is in standard DECB format, with a single block of type 0xFF. Since internal structures use absolute addresses, it is important to keep that header to know the loading address of the BASIC program. +
- +
-^Offset^Description^ +
-|0|File type = 0xFF| +
-|1|File size| +
-|3|Load address| +
- +
-===== Lines ===== +
- +
-A BASIC program is a packed linked list of program lines. +
- +
-^Offset^Description^ +
-|0|Address of next line| +
-|2|Line number in hex| +
-|4|NULL-terminated line data| +
- +
-The end of the listing is marked with a NULL next line pointer. +
- +
-The line data is a mix of tokens and ASCII characters. The tokens are used to encode all the keywords and functions, but everything else (numbers, strings, comments) is stored in ASCII. +
-====== Keyword ​and token list ======+
  
 ^Keyword^Description^ ^Keyword^Description^
documentations/basic_keywords.txt · Last modified: 2015/03/15 07:41 by pulkomandy
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