Adding Command Line-esque Parameters to C64 and C128 Programs
It's actually pretty easy to add support for command-line-style parameters to Commodore 64 and Commodore 128 programs by reading the line input buffer with some PEEKs. We examine how to do this, why this might be beneficial, and give some example code in BASIC and Assembly. We also learn a bit about how BASIC parses and interprets our code, and the internal structure of these commands and programs. And we look at the Commodore 128 feature to RUN a file from disk that further enhances the use of parameters.
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Previous videos referenced:
"About Commodore 64 BASIC Abbreviations": • About Commodore 64 BASIC Abbreviations
"Cracking a Commodore 64 Game From Cassette: Livingstone, I Presume?": • Cracking a Commodore 64 Game From Cas...
"4-Byte Commodore 64 Demo and Follow-up on 10 PRINT Orthogonal [32 bytes]": • 4-Byte Commodore 64 Demo and Follow-u...
"Using Commodore 64 BASIC SYS Parameters in Machine Language": • Using Commodore 64 BASIC SYS Paramete...
Index:
0:00 Can parameters be added to a Commodore BASIC program?
1:57 How EXAMPLE 1 works
5:42 What's the point?
7:15 Some problems
9:12 EXAMPLE 2: More Robust
10:55 BORDER: A slightly more useful example
14:28 Rhymes with Orange: a tokenization problem
16:02 Commodore 128 Mode: RUN "FILENAME"
18:30 Turbo Macro Pro: Assembly example
19:52 BASIC Header / Stub
21:13 TXTPTR / rest of code walkthrough
24:35 Modifying for border colour version
25:36 Thanks!
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