'Space Covidders' Goes to the Arcade?

'Space Covidders' Goes to the Arcade?

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A little hack of Space Commanders from last year gets an unexpected (and awesome) makeover, courtesy of someone else's talent.
Happy 35th birthday, IBM PC!

Happy 35th birthday, IBM PC!

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My present: 'Sorry Ass' - a 512-byte boot sector version of Bill Gates' DONKEY, the infamous demonstration game included with DOS and BASIC 1.0.
Keen 4 Mystery Code Demystified

Keen 4 Mystery Code Demystified

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A little bit of reverse-engineering fun.  Why was a seemingly-unused routine left over in Commander Keen 4's executable code, and does it do anything useful?  Let's find out!
So-called "IBM" Freeware Games from the Early '80s

So-called "IBM" Freeware Games from the Early '80s

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An archeological riddle: these very early public domain games all have similar title screens, which say "IBM" although they were clearly homebrew creations.  Where do they come from, who made them, and what is that cryptic "mystery code" all about?
101 Monochrome Mazes: Why Not Color?

101 Monochrome Mazes: Why Not Color?

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IBM officially discouraged PC programmers from exploiting hardware-specific tricks, since that came at the expense of compatibility.  Then, they went and released a game that did just that.  Here's why it was (artificially) prevented from running on color systems.