BASIC (Was: Reading HP2000 tapes

[Brent Hilpert]

The HP9830 (1972) with it's ROM'ed BASIC works this way.
LIST produces a 'cleaned up' version of the source code.



On 2018-Jul-17, at 1:21 PM, Guy Sotomayor Jr via cctalk wrote:

> I should also mention that for the IBM S/23, once the BASIC program is entered, the original
> source is discarded and only the tokenized code remains (comments are retained as-is).   The
> LIST command runs a de-tokenizer and reconstructs the original source (well close to it anyway).
> 
> TTFN - Guy
> 
>> On Jul 17, 2018, at 12:33 PM, John Foust via cctalk <cctalk at classiccmp.org> wrote:
>> 
>> At 03:53 PM 7/14/2018, Fred Cisin via cctalk wrote:
>>> On Sat, 14 Jul 2018, Ed Sharpe via cctalk wrote:
>>>> isn't the  basic  programs  also stored in tokinized  forms!?!?
>>> 
>>> Yes.
>>> And the tokens are not the same between different brand implementations, or even between different versions, such as MBASIC 4 and MBASIC 5.
>>> http://fileformats.archiveteam.org/wiki/Tokenized_BASIC
>> 
>> I remember a detokenizer for RSTS BASIC-PLUS that's not on that list.
>> 
>> I think it was called a "decompiler" though.  Seemed like magic at the time.
>> 
>> Googling reveals "You may be remembering the BASIC PLUS
>> decompiler under RSTS.  RSTS BASIC PLUS was interpreted from "push-pop" code.
>> The symbol table was available in the compiled file, and the correspondence
>> between push-pop operations and BASIC PLUS source was very close, so you
>> could get back very reasonable code."
>> 
>> And our previous discussion of it a decade ago:
>> 
>> https://marc.info/?l=classiccmp&m=121804804023540&w=2
>> 
>> - John
>> 
>