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Lex AI Dave Plummer

1:59:30 recording · EN · 2 speakers

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Brief overview

Dave Plummer traces his path from a Radio Shack TRS-80 to Windows Task Manager, Pinball and zip folders.

  1. Constraints made the code small and fastWith 640K total, wasting 10K cost every machine in the world 10K, and Task Manager shipped at 87K by skipping the C runtime.
  2. Most of the job is debugging, not creatingPlummer puts it at 20% creating and 80% debugging and fixing, largely in raw assembly across Intel, MIPS, Alpha and PowerPC.
  3. Side projects became shipping Windows featuresTask Manager, zip folders and the Pinball port all started as personal work, and Visual Zip was acquired after a cold call.
Executive Summary AI
  • Dave Plummer's first machine was a TRS-80 Model 1 Level 1 4K he set up himself at a Radio Shack around 1979-80, aged about 11, and he rates the Commodore 64 as the more influential computer because of its sales and reach.9:53
  • After dropping out of high school, working at 7-Eleven and talking his way back into class at 21, he funded university with HyperCache, an Amiga disk cache, then cold-emailed the three or four Microsoft addresses on his registration cards; Alistair Banks passed him to Ben Slivka, who hired him into MS-DOS for the summer.21:37
  • On MS-DOS the hard ceiling was 640K, so every byte the operating system used was a byte the customer lost, and he moved SmartDrive and the DoubleSpace compression engine into high memory to claw back another 64K.27:15
  • Task Manager began as a side project he wrote at home against the registry's performance data, came in-house to use NtQuerySystemInformation, avoided linking the C runtime entirely and shipped in NT4 at about 87K, built for reliability, fast resizing and minimal repainting.46:41
  • His shareware Visual Zip drew a cold call from Betsy at Microsoft proposing an acquisition - she did not know he already worked there - and after accepting he bought the used 93 torch-red Corvette he had taped to his monitor as motivation.1:03:49
Key Quote
“At the time, it was the single most potent assemblage of smart people that I've ever been a part of.”
— Dave Plummer23:46
Key Quote
“So if you use 10K needlessly, every machine in the world now has 10K less.”
— Dave Plummer27:23
Key Quote
“Yeah, I would say that 20% of my professional life has been creating and 80% has been debugging and fixing.”
— Dave Plummer42:12