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This page (revision-15) was last changed on 11-May-2018 16:12 by Maury Markowitz  

This page was created on 19-Oct-2017 00:56 by Roland B. Wassenberg

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Typical BASICs use an interpreter that examines every line of code as the program runs. They do this because it minimizes the amount of RAM used; only one line of code is actively worked on so the amount of temporary memory required is small. To improve speed and memory usage, most BASICs "tokenize" the lines, replacing keywords with "tokens", typically a single byte. Atari BASIC does this when the line is entered, so, for instance, when it sees a {{PRINT}} in the line of code, it replaces this with a 32 (decimal), making the source more compact and easier to process when its run. This process is reversed when you {{LIST}} the program, converting the 32 back into {{PRINT}} so you never even realize it happened.
Typical BASICs use an interpreter that examines every line of code as the program runs. They do this because it minimizes the amount of RAM used; only one line of code is actively worked on so the amount of temporary memory required is small. To improve speed and memory usage, most BASICs "tokenize" the lines, replacing keywords with "tokens", typically a single byte. Atari BASIC does this when the line is entered, so, for instance, when it sees a {{PRINT}} in the line of code, it replaces this with a 32 (decimal), making the source more compact and easier to process when it's run. This process is reversed when you {{LIST}} the program, converting the 32 back into {{PRINT}} so you never even realize it happened. This is why, for instance, typing {{P.}} turns into {{PRINT}} when you later {{LIST}} it.
Version Date Modified Size Author Changes ... Change note
15 11-May-2018 16:12 4.339 kB Maury Markowitz to previous
14 11-May-2018 16:07 4.126 kB Maury Markowitz to previous | to last
13 07-May-2018 22:33 4.035 kB Maury Markowitz to previous | to last
12 07-May-2018 22:29 3.789 kB Maury Markowitz to previous | to last
11 04-May-2018 17:00 2.178 kB Maury Markowitz to previous | to last DMSC-FastBasic ==> FastBasic
10 02-May-2018 16:19 2.178 kB Maury Markowitz to previous | to last
9 28-Apr-2018 15:09 2.086 kB Maury Markowitz to previous | to last
8 28-Apr-2018 15:07 1.998 kB Maury Markowitz to previous | to last
7 28-Apr-2018 15:05 1.99 kB Maury Markowitz to previous | to last
6 28-Apr-2018 03:00 1.907 kB Maury Markowitz to previous | to last
5 26-Apr-2018 18:50 1.91 kB Maury Markowitz to previous | to last
4 21-Oct-2017 02:12 0.846 kB Roland B. Wassenberg to previous | to last
3 19-Oct-2017 01:16 0.875 kB Roland B. Wassenberg to previous | to last
2 19-Oct-2017 00:56 0.019 kB Roland B. Wassenberg to previous | to last Dmsc-FastBasic ==> DMSC-FastBasic
1 19-Oct-2017 00:56 0.019 kB Roland B. Wassenberg to last dmsc FastBasic
« This page (revision-15) was last changed on 11-May-2018 16:12 by Maury Markowitz