Apple III: SOS Error 90
This article has been archived and is no longer updated by Apple.
SOS error 90 is, in fact (in hex), error $5A. Error code $5A is a 'bad bitmap
address on a block device'. This usually indicates that the directory bitmap
information is damaged or mangled in some way, or at least SOS thinks so.
address on a block device'. This usually indicates that the directory bitmap
information is damaged or mangled in some way, or at least SOS thinks so.
Last Modified: Feb 18, 2012