Internal File System Errors
1     chNoBuf        no free cache buffers (all in use)
2     chInUse        requested block in use
3     chnotfound     requested block not found
4     chNotInUse     block being released was not in use
16    fxRangeErr     file position beyond mapped range
17    fxOvFlErr    extents file overflow
32    btnotfound   record not found
33    btexists     record already exists
34    btnospace    no available space
35    btnoFit      record doesn't fit in node 
36    btbadNode    bad node detected
37    btbadHdr     bad BTree header record detected
48    cmnotfound   CNode not found
49    cmexists     CNode already exists
50    cmnotempty   directory CNode not empty (valence = 0)
51    cmRootCN     invalid reference to root CNode
52    cmbadnews    detected bad catalog structure
53    cmFThdDirErr thread belongs to a directory not a file
54    cmFThdGone   file thread doesn't exist
64    dsBadRotate  bad BTree rotate

Slot Declaration ROM Manager Errors
1     siInitSDTblErr  slot int dispatch table could not be initialized.
2     siInitVBLQsErr  VBLqueues for all slots could not be initialized.
3     siInitSPTblErr  slot priority table could not be initialized.
10    sdmJTInitErr    SDM Jump Table could not be initialized.
11    sdmInitErr      SDM could not be initialized.
12    sdmSRTInitErr   Slot Resource Table could not be initialized.
13    sdmPRAMInitErr  Slot PRAM could not be initialized.
14    sdmPriInitErr   Cards could not be initialized.

HD20 Driver Errors
16    wrtHsLw         HSHK low before starting
17    wrtHSLwTO       Time out waiting for HSHK to go low
19    wrtHSHighTO     Time out waiting for HSHK to go high
32    rdHsHi          HSHK high before starting
33    rdSyncTO        Time out waiting for sync ($AA) bye
34    rdGroupTO       Time out waiting for group
36    rdHoffSyncTO    Time out waiting for sync after holdoff
37    rdHsHiTO        Time out waiting for HSHK high
38    rdChksumErr     Checksum error on response packet
48    invalidResp     First byte in response packet was wrong
49    sqncNumErr      Sequence number in response packet was wrong
50    dNumberErr      Drive number in response packet was wrong
64    noResp          No response packet ever received

SCSI Manager Errors
2     scCommErr       Communications error (operations timeout)
3     scArbNBErr      Arbitration failed during SCSIGet – Bus busy
4     scBadparmsErr   Bad parameter or TIB opcode
5     scPhaseErr      SCSI bus not in correct phase for operation
6     scCompareErr    SCSI Manager busy with another operation when
                      SCSIGet was called
7     scMgrBusyErr    SCSI Manager busy with another operation when
                      SCSIGet was called
8     scSequenceErr   Attempted operation is out of sequence – e.g.,
                      calling SCSISelect before doing SCSIGet
9     scBusTOErr      Bus timeout before data ready on SCSIRBlind and
                      SCSIWBlind
10    scComplPhaseErr SCSIComplete failed – bus not in Status phase

Serial Driver Error Masks
1     swOverrunErr    Serial Driver overrun error
16    parityErr       Serial parity error
32    hwOverrunErr    Serial hardware overrun
64    framingErr      Serial framing error

Miscellaneous Result Code
1     evtNotEnb       Event not enabled at PostEvent

CDev Errors
0     cdevMemErr      Memory shortfall; alert user please
1     cdevResErr      Couldn't get a needed resource; alert
3     cdevUnset       cdevValue is initialized to this
-1    cdevGenErr      General error; gray cdev w/o alert

Script Manager Errors
0     smNotTruncated  No truncation was necessary
1     smTruncated     Truncation performed
-1    smTruncErr      General error

Communications Toolbox Errors
0     ctbuNoErr        ????
-1    ctbuGenericError ????

Communications Resource Manager Errors
0     crmNoErr        ????
-1    crmGenericError ????

Connection Manager Errors
0     cmNoErr            ????
1     cmRejected         ????
2     cmFailed           ????
3     cmTimeOut          ????
4     cmNotOpen          ????
5     cmNotClosed        ????
6     cmNoRequestPending ????
7     cmNotSupported     ????
8     cmNoTools          ????
9     cmUserCancel       ????
11    cmUnknownError     ????
-1    cmGenericError     ????

File Transfer Manager Errors
0     ftNoErr           ????
1     ftRejected        ????
2     ftFailed          ????
3     ftTimeOut         ????
4     ftTooManyRetry    ????
5     ftNotEnoughDSpace ????
6     ftRemoteCancel    ????
7     ftWrongFormat     ????
8     ftNoTools         ????
9     ftUserCancel      ????
10    ftNotSupported    ????
11    ftUnknownError    ????
-1    ftGenericError    ????

Midi Manager MIDIPacket Errors
1     midiOverflowErr ????
2     midiSCCErr      ????
3     midiPacketErr   ????
255   midiMaxErr      all command words less than this are errors

Terminal Manager Errors
0     tmNoErr           ????
1     tmNotSent         ????
2     tmEnvironsChanged ????
7     tmNotSupported    ????
8     tmNoTools         ????
11    tmUnknownError    ????
-1    tmGenericError    ????

AppleTalk Errors
-1    overrunErr      ???? (returned by ReadPacket & ReadRest routines)
-2    crcErr          ????
-3    underrunErr     ????
-4    lengthErr       ????

System Errors to put up msg dialogs
-10   dsMacsBugInstalled       say “MacsBug Installed”
-11   dsDisassemblerInstalled  say “Disassembler Installed”
-12   dsHD20Installed          say “HD20 Startup”