Apple-2-SW/bitmap-editor
1
0
Fork 0
mirror of https://github.com/tilleul/apple2.git synced 2025-02-20 08:28:59 +00:00
Code Issues Projects Releases Wiki Activity

Update README.md

Browse Source
This commit is contained in:
tilleul 2022-07-08 22:58:25 +02:00 committed by GitHub
parent ceeb267746
commit 101ede69b2
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
applesoft/nfs/README.md
View File

@ -148,7 +148,9 @@ Applesoft variables are stored in two separate areas:
You don't need to declare a variable to use it. As soon as a variable name is discovered by the Applesoft parser, the following happens:
* the type of the variable is determined so Applesoft knows where to look for the variable's name (``VARTAB`` or ``ARYTAB``)
* Applesoft scans the memory repository for the specified variable type and looks for an existing variable of the same name
* if it's not found, it means it's a new variable and the appropriate space (variable name, type, array indices, value) is reserved at the top of the memory pile where all variables of the same type reside (optionnally moving the ``ARYTAB`` area up if a new real/integer/string/function variable needs to be declared). The new variable's value is referenced for next step
* if it's not found, it means it's a new variable.
* If the code where it appears is a variable assignment, then the appropriate space (variable name, type, array indices, value) is reserved at the top of the memory pile where all variables of the same type reside (optionnally moving the ``ARYTAB`` area up if a new real/integer/string/function variable needs to be declared).
* If it's not a variable asssignment, then variable type's default value is referenced for next step but the variable IS NOT created.
* if the variable already exists, its value is referenced for the next step
* then the value of the variable is used/replaced/computed/etc. (depending on the actual code)