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RE: [N8VEM-S100:5408] ZFDC Write Protect Issues

Ok, here are some symptoms when I try to read a 1.44 mb dos diskette:

Select drive- ok
Select format - ok.  Write protect led illuminates.
Step in - ok
Read a track or sector - system halts with halt led illuminated.

These symptoms occur with both a 5.25 and a 3.5" drive using different cables and power source.

Suggestions appreciated,