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- Apple II
- Technical Notes
- _____________________________________________________________________________
- Developer Technical Support
-
-
- AppleTalk
- #2: ProDOS 8 Compatibility on the IIe and IIGS
-
- Written by: Mark Day November 1988
-
- This Technical Note describes areas which could cause an application to run
- under the AppleShare Apple IIe workstation software, but fail under the Apple
- IIGS workstation software.
- _____________________________________________________________________________
-
- o If code is running in auxiliary memory in emulation mode (e.g.,
- ProDOS 8 programs that run code from auxiliary memory), make sure
- $0100 in auxiliary memory is set to the normal stack pointer and
- $0101 in auxiliary memory is set to the auxiliary (alternate)
- stack pointer. (See page 93 of the Apple IIe Technical Reference
- Manual.)
- o Make sure ProDOS calls are not made from auxiliary memory; Apple
- has never recommended doing this, and it is not supported.
- o Make sure interrupts are enabled when making ProDOS 8 calls.
- o Make sure interrupts are not disabled for long periods of time,
- nor for a high percentage of time. Whenever interrupts are
- disabled, there is a chance that an AppleTalk packet will be
- missed (which could cause AppleShare volumes to be unmounted).
- The more interrupts are disabled, the more likely that packets
- will be missed. This risk is inherent for any application that
- disables interrupts (directly or indirectly), therefore,
- interrupts should be disabled with discretion and only when
- absolutely necessary.
- o Make sure programs get the completion routine return address from
- the GetInfo call when they are started.
- o Make sure to identify AppleTalk by calling GetInfo and checking
- for an invalid call number error (which means AppleTalk is not
- present). Do not use the ATLK signature bytes for identification.
- See Apple II AppleTalk Technical Note #1, Identifying AppleTalk.
-
-
- Further Reference
- o Apple IIe Technical Reference Manual
- o Apple II AppleTalk Technical Note #1, Identifying AppleTalk
-
-