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Tag Archives: retrocomputing

Semantics of FOR-NEXT Loops

Posted on November 14, 2022 by Bill Wake

I’ve been implementing the FOR-NEXT loop in a BASIC interpreter I’m building. It brings up some issues of programming language semantics. Expectations Shattered I had expected this would correspond to a while loop, something like this: From two descriptions of Continue reading Semantics of FOR-NEXT Loops→

Posted in xp123.com | Tagged programmer, retrocomputing, XPlorations

Ohio Scientific and Commodore 64 Environments

Posted on July 21, 2021 by Bill Wake

Environments vary substantially between computers, so you’ll often see environment-specific code hidden in the PEEKs and POKEs of old BASIC programs.  We’ll take a brief tour of the Ohio Scientific and Commodore 64, two computers from the late 1970s to Continue reading Ohio Scientific and Commodore 64 Environments→

Posted in xp123.com | Tagged programmer, retrocomputing, XPlorations

Transliterating Old-School BASIC

Posted on July 14, 2021 by Bill Wake

Once in a while, I run into a 1980s-era BASIC program, typically written for Commodore 64, Apple ][, or TRS-80. I’d like to transliterate it into a modern language, refactor it, and explore it. These old programs make a nice Continue reading Transliterating Old-School BASIC→

Posted in xp123.com | Tagged compilers, programmer, refactoring, retrocomputing

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