Why is a working business one dead ISA card away from shutting down?

Labs, workshops and small firms still run core processes on DOS machines with custom ISA cards, parallel-port dongles and dBase or Clipper apps, the one person who understood them has left, and a hardware failure would stop the business.

Category: Others · Trend: LLM · Opportunity score: 8.0 / 10

What is the “Why is a working business one dead ISA card away from shutting down?” problem in 2026?

Labs, workshops and small firms still run core processes on DOS machines with custom ISA cards, parallel-port dongles and dBase or Clipper apps, the one person who understood them has left, and a hardware failure would stop the business.

Who has this problem?

Owners and lone IT staff at labs, manufacturers and small firms running critical DOS-era software and instruments.

Recorded source context

Dataset source note: I know of a DOS machine at a wool testing place that uses an ISA card based imager for measuring the micron and other things.

This note may summarize the referenced material rather than quote it verbatim. Source label: Ask HN thread asking who still keeps a DOS machine running because the business depends on it, 25 September 2026, 277 points and 293 comments. (primary source).

Existing players in this space

  • 86Box and PCem: Cycle-accurate PC emulators, with no support for bespoke ISA instrument cards.
  • DOSBox: Runs DOS software but not the hardware it controls.
  • Harbour: Open-source Clipper-compatible compiler that still needs someone to port and test the app.
  • Stockpiling period PCs: The real strategy the thread describes, until the spares run out.

What existing players are missing

A migration service that reads the old dBase or Clipper source and data files, explains what the app actually does, generates a tested modern equivalent, and documents the instrument card protocol so the hardware can be bridged or replaced.

How Real Problem AI scores this opportunity

Aggregate score: 8.0 / 10. Four-axis rubric:

  • Problem severity: 8 / 10
  • AI feasibility today: 7 / 10
  • Market signal: 9 / 10
  • Competition gap: 8 / 10

How to build a solution: stack hints

  • LLM code comprehension of legacy xBase source
  • Automated test generation from recorded runs
  • Data file conversion from DBF
  • Hardware protocol capture and documentation

Related Others problems on Real Problem AI