troubleshooting

A few tests for a non-booting Disk II controller

Submitted by S.Elliott on April 1, 2023 - 12:23am
A collection of simple (simplistic) tests for diagnosing a non-booting Disk II or A2 disk controller:
  • Monitor commands to test 6 of the 8 data latches in the 9334 chip
  • Monitor commands to load just one sector, then beep and break
  • Attach an LED to troubleshoot individual latches Q0 through Q3
  • Use a flashlight to "candle" circuit traces
  • Use wood or bamboo to scrape debris off the circuit board
Tags: 
troubleshooting
Subscribe to troubleshooting