Radio Shack TRS-80 Model II Reference Manual page 182

Model II
TRSDOS
Error Codes and Messages
----..
Register A usually contains a return code after any function call. The Z
flag is set when no error occurred. Exceptions are certain computational
routines, which use the A and F registers to pass back data and status
information.
CODE MESSAGE
No Error Found
Bad Function Code On SVC Call Or No Function Exists
. CharacterNotA\lailable
Parameter Error On Call
CRCErrorDuring Disk I/O Operation
Disk Sector Not Found
Att~mptToOpenAFlieWhich
Has Not Been Closed
Illegal Disk Change
DisRDriv~f"Jptl3eadY
Invalid Data Provided By Caller
JYla~imum
Of
16Fil~sMayBe
Open At Once
File Already In Directory
No
DriveA\lajl~bl~ForAn
Open
Write Attempt To A Read Only File
Write FaultOn.DiSk I/O
Disk Is Write Protected
... DCBISl\Aodified AndJsUnusable
Directory Read Error
OirectpryWri1e Errpr
Improper File Name (filespec)
FADHead Error
FAD Write Error
FIDReliildErrOr
FlO Write Error
FileNo~F()llttd
File Access Denied Due To Password Protection
DireclorySp~~e.FUU
Disk Space Full
J\t:!~mptToHeq.d
pa,§t §()F
Read Attempt Outside Of File Limits
~oMore)§xtents·ANaila.ble
(16 Maximum)
- - Program Not Found
UnknowrlDrive Number (filespec)
Disk Space Allocation Cannot Be Made Due To Fragmentation Of Space
.AttemPt TqlJseANqnProgramFile As A Program
Memory Fault During Program Load
Parliilmeter FOrOpenls Incorrect
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