I upgraded my Commodore IEEE-488 disk drive diagnostics ROM with new features - it now helps identify both digital and mechanical failures in these classic CBM drives.

🔗 GitHub: https://piers.rocks/u/ieeedr

✨ New Capabilities:

  • 🧪 Diagnoses digital PCB component failures
  • 📊 Reports results via LEDs and IEEE-488 interface
  • 💻 Includes PC and PET companion software
  • 🔄 Controls spindle/stepper motors for mechanical diagnostics
  • 💾 Supports 2040/3040/4040 - may also support 8050/8250 (currently untested)

⏱️ Timestamps:
00:00 Introduction
01:32 Safety precautions
02:06 Installing the ROM
04:04 Tests passing
06:07 Failed RIOT 6532 UE1
08:21 Failed TIO 6532 UC1
09:39 Failed RAM
12:07 Failed secondary processor
13:50 Operating with missing ICs
14:25 Contacting ROM using computer
15:26 Controlling ROM using PC
16:53 Testing the spindle motors
18:11 Testing the stepper motors
21:43 Querying additional ROM status
24:13 Final thoughts

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