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- Apple II
- Technical Notes
- _____________________________________________________________________________
- Developer Technical Support
-
- AppleTalk
- #1: Identifying AppleTalk
-
- Revised by: Jim Luther March 1990
- Written by: Dan Strnad November 1988
-
- This Technical Note describes the correct methods for identifying AppleTalk
- under ProDOS 8 and GS/OS, as the ATLK ROM signature is no longer used.
- Changes since July 1989: Added warning concerning ProDOS 8, version 1.4.
- _____________________________________________________________________________
-
- To determine if an application has been launched over the network, refer to
- the NetLaunch code fragment found in the AppleShare Programmer's Guide for the
- Apple IIGS.
-
- Under ProDOS, to identify both AppleTalk and the slot with which it is
- associated for printing, refer to Apple II AppleTalk Technical Note #4,
- Printing Through the Firmware.
-
- To identify AppleTalk under ProDOS 8:
-
- 1. Issue an AppleShare GetInfo call.
- 2. If there is no error result, AppleTalk is installed.
-
- InfoParams DB $00 ;Synchronous only
- DB $02 ;GetInfo call number
- InfoResult DS 13 ;<- results returned here
-
- CheckATalk JSR $BF00
- DB $42 ;$42 command # for AppleTalk calls
- DW InfoParams ;Parameter list address
- BCS NoATalk ;handle the error
- IsATalk ... ;AppleTalk installed when here
-
- NoATalk ... ;AppleTalk not installed when here
-
- Warning: Due to a bug in ProDOS 8, version 1.4, using the $42 call
- crashes ProDOS 8 if AppleTalk is not installed.
- Applications that use this routine to check for AppleTalk
- should ship with ProDOS 8 version 1.5 or greater, thus
- avoiding this bug. (ProDOS 8 Technical Note #21,
- Identifying ProDOS Devices contains a routine which
- correctly identifies the presence AppleTalk under all
- versions of ProDOS 8.)
-
- To identify AppleTalk protocols and AppleShare file system under System
- Software 5.0:
-
- 1. Set up the parameter block for a GS/OS GetFSTInfo call using
- fstNum = 1.
- 2. Issue the GetFSTInfo call.
- 3. If the fileSysID is $0D the AppleShare FST and AppleShare are
- present.
- 4. If a parameter out of range error ($53) results, the AppleShare
- file system is not present.
- 5. Otherwise, if steps 3 and 4 are inconclusive, increment the fstNum
- and loop back to step 2.
-
- To identify AppleTalk protocols, including LAP through PFI but excluding the
- file system, under System Software 5.0:
-
- 1. Set up the parameter block for a GS/OS DInfo call using device
- number one.
- 2. Issue the DInfo call.
- 3. If the deviceID is $1D, the AppleTalk main driver and AppleTalk
- are present.
- 4. If a parameter out of range error ($53) results, the AppleTalk
- protocols are not present.
- 5. Otherwise, if steps 3 and 4 are inconclusive, increment the device
- number and loop back to step 2.
-
- To identify AppleTalk protocols, including LAP through ASP but excluding the
- file system, under System Software 4.0:
-
- 1. Issue an an SPGetStatus call
- 2. If the call returns without error, AppleTalk is present.
-
- Note: With the release of System Software 5.0, earlier versions are not
- supported.
-
-
- Further Reference
- _____________________________________________________________________________
- o Inside AppleTalk
- o AppleShare Programmer's Guide for the Apple IIGS
- o GS/OS Reference
- o Apple II AppleTalk Technical Note #4, Printing Through the Firmware
- o ProDOS 8 Technical Note #21, Identifying ProDOS Devices
-
-