Editing Osborne Vixen Troubleshooting Guide (section)

== Floppy Disk & Storage Subsystem Failures ==

The Vixen uses standard 5.25" double-density drives. Disk faults are frequent due to drive age and connector issues.

=== Disk System Fault Table ===

{| class="wikitable styled-table"
! Symptom !! Likely Cause !! Action
|-
| "BOOT ERROR" or no boot from disk || Bad disk, dirty heads, drive failure || Clean heads, try known-good disk, check drive power
|-
| Drive spins but no access || Ribbon cable loose, controller fault || Reseat cables, test controller ICs (e.g. WD1793)
|-
| "NO DISK" or "DISK ERROR" messages || Faulty drive select logic, bad ROM || Check drive select jumpers, test/replace ROM
|-
| Disk not ejected || Mechanical jam, failed eject solenoid || Inspect/repair drive mechanism
|}

=== Floppy Drive Diagnostic Steps ===
# Try booting from a known-good CP/M disk.
# Listen for drive spin-up and head movement.
# Swap drive ribbon cables; if problem moves, suspect drive.
# If both drives fail, check disk controller IC (WD1793 or equivalent) and associated logic.