C64 Basic negative DATA entries not working

rolandshacks / vs64

C64 Development Environment for Visual Studio Code

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C64 Basic negative DATA entries not working #59

Closed clouddistortion closed 7 months ago

clouddistortion commented 8 months ago

Using a Mac OS Ventura 13.6.6 and Visual Studio Code Version: 1.87.2 (Universal) Commit: 863d2581ecda6849923a2118d93a088b0745d9d6 setup for creating a BASIC script I encountered a weird error:

The following results in a SYNTAX ERROR within VICE.

10 READ B%
20 if B%<0 THEN END
30 ? B% 
40 GOTO 10
50 DATA 9,2,4,5,5,7
60 DATA 0,9,8,7,5,-1

If I then LIST the script and just overwrite the minus character and updating the line 60 it works.

rolandshacks commented 8 months ago

Thanks. That's a nice catch...

The "magic" is: the BASIC interpreter handles '-' and '+' differently for DATA lines - which I now had to learn.

DATA line: + and - are just characters
Any other line: + and - are operators and are converted to a specific "token" byte The LIST command shows everything identically, as the tokens get "de-tokenized" back to "-" and "+" ...

Fix will be rolled out with v2.5.6.

clouddistortion commented 7 months ago

Got the latest release v2.5.6 from github (installed manually). Works great thanks a lot