RE: BASIC OS for the PC

From: Baltissen, GJPAA (Ruud) <ruud.baltissen_at_apg.nl>
Date: Wed, 21 Dec 2016 11:01:45 +0000
Message-ID: <54F350D2C6501448A3EE14B7854C5FB55241E262@WSV10441N3.office01.internalcorp.net>
Hallo Sipro,


> Think about the string variables: As soon as these are not only assignments ....

Very very good explanation, thank you very much!

My idea was quite simple: the moment I run into a variable, I will reserve memory for it in the data area. And just like in Pascal, 256 bytes for the string. That is, purely for the data. I also have to reserve some memory for the name, type, etc. That is not needed for a compiled program but an interpreter has to check every time if a found variable already exists or not. 


> in which case the pointer points into the program area

Hmm, nice trick. Can save a lot of memory. Just need to come up with something smart for what to do if the string is changed. I think a simple pointer will do: it either points to the program area or the reserved area. But then I need a mechanism that tells BASIS what memory is in use for strings or not. Just a quick one: non-strings bottom-up, strings top-down plus a pointer that points to the free area under the string-memory. But the moment they meet each other I have an "?OUT OF MEMORY ERROR".


> No internet? How that? ;)

Quite simple, they don't want it/haven't any use for it. FYI, they live in Grki Noteckie (use Google Maps to find it) and so far I haven't found any Wifi signal there yet. I cannot imagine that there isn't any internet at all (satellite, internet over mobile phone) there but still a bit strange. 


Met vriendelijke groet / With kind regards,
Ruud Baltissen

www.Baltissen.org



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