Internet History Podcast

18. The True Story Behind Halt And Catch Fire - An Interview With Rod Canion

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May 26, 2014
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INSIGHT

Compatibility Was The Killer Feature

  • Rod Canion realized a portable PC would only succeed if it ran the existing IBM PC software ecosystem.
  • He decided to reverse engineer IBM's BIOS and adapt MS-DOS so users could run VisiCalc and other apps without porting.
ANECDOTE

Clean Room Reverse Engineering Story

  • Compaq used a two-person clean-room approach to legally recreate IBM's copyrighted BIOS.
  • One engineer wrote a spec from IBM's behavior, then another who'd never seen IBM's code implemented fresh BIOS code to match functionality.
INSIGHT

MS-DOS Variants Required Heavy Compatibility Work

  • Microsoft’s MS-DOS variants were not fully compatible across vendors, forcing Compaq to extensively modify DOS to run third‑party software.
  • Compaq spent months and hundreds of DOS changes to achieve near‑perfect compatibility.
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