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- Apple II
- Technical Notes
- _____________________________________________________________________________
- Developer Technical Support
-
- SmartPort
- #9: Apple II SCSI Errata
-
- Written by: Llew Roberts July 1990
-
- This Technical Note documents SCSI-specific anomalies that were discovered in
- the development of the Apple II High-Speed SCSI card.
- _____________________________________________________________________________
-
- During the testing of the Apple II High Speed SCSI Card, several SCSI-related
- issues of interest to developers were discovered. Most of these issues
- directly relate to SCSI devices with removable media.
-
- If a CD-ROM has a bad directory, the firmware hangs because it gets a "Read In
- Progress" error. There is no timeout. The system can be recovered if the CD-
- ROM is manually ejected.
-
- If the media is ejected while a SmartPort DIB Status call is in progress, the
- call returns with incorrect results (it reports DISKSW and that the block
- count of the device is zero). In order to avoid this conflict, bracket the
- DIB Status call with the SmartPort SCSI specific Control Calls Prevent Removal
- ($1A) and Allow Removal ($1B).
-
- A SmartPort FORMAT call, in some cases, does not update the DIB correctly to
- reflect the new or changed partition map. If a SmartPort Init call is always
- made immediately after the FORMAT, the DIB is rebuilt correctly. Note that
- after formatting a tape, the tape should be removed from the SCSI tape drive
- before an Init call is made. An Init call causes the tape to rewind, hanging
- the system with no time-out until the rewind is complete.
-
- Further Reference
- _____________________________________________________________________________
- o Apple IIgs Firmware Reference
- o Apple II High-Speed SCSI Card Technical Reference
-
-