Re: Forbidden variables in BASIC

The trouble is caused by the tokenizer. If you create an already tokenized
file by some other means, you can actually use these variable names.


On Thu, May 14, 2026 at 5:24 PM Allen Huffman via Coco <
[email protected]> wrote:

> BASIC cannot use keywords as variables, so certain two letter combinations
> are not valid in BASIC.
>
> As you add Extended BASIC, it added “FN” so that can’t be used.
>
> As you add Disk BASIC, it added “AS”.
>
> I am updating my blog post. Can you think of any others?
>
>
> 20 ' FORBIDDEN BY CB
>
> 30 GO=42
> 40 IF=42
> 50 ON=42
> 60 OR=42
> 70 TO=42
>
> 80 ' FORBIDDEN BY ECB
>
> 90 FN=42
>
> 100 ' FORBIDDEN BY DECB
>
> 110 AS=42
>
>
> Post:
> https://subethasoftware.com/2025/03/24/color-basic-supports-two-letter-variables-except-when-it-doesnt/#comment-42296
>
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