diff --git a/ProFUSE/Exception.h b/ProFUSE/Exception.h
index a163ec9..043cd8c 100644
--- a/ProFUSE/Exception.h
+++ b/ProFUSE/Exception.h
@@ -5,6 +5,66 @@
 #include <exception>
 
 namespace ProFUSE {
+    
+
+// ProDOS Errors
+enum
+{
+    badSystemCall = 0x01,
+    invalidPcount = 0x04,
+    gsosActice = 0x07,
+    devNotFound = 0x10,
+    invalidDevNum = 0x11,
+    drvrBadReq = 0x20,
+    drvrBadCode = 0x21,
+    drvrBadParm = 0x22,
+    drvrNotOpen = 0x23,
+    drvrPriorOpen = 0x24,
+    irqTableFull = 0x25,
+    drvrNoResrc = 0x26,
+    drvrIOError = 0x27,
+    drvrNoDevice = 0x28,
+    drvrBusy = 0x29,
+    drvrWrtProt = 0x2b,
+    drvrBadCount = 0x2c,
+    drvrBadBlock = 0x2d,
+    drvrDiskSwitch = 0x2e,
+    drvrOffLine = 0x2f,
+    badPathSyntax = 0x40,
+    invalidRefNum = 0x43,
+    pathNotFound = 0x44,
+    volNotFound = 0x45,
+    fileNotFound = 0x46,
+    dupPathName = 0x47,
+    volumeFull = 0x48,
+    volDirFull = 0x49,
+    badFileFormat = 0x4a,
+    badStoreType = 0x4b,
+    eofEncountered = 0x4c,
+    outOfRange = 0x4d,
+    invalidAccess = 0x4e,
+    buffTooSmall = 0x4f,
+    fileBusy = 0x50,
+    dirError = 0x51,
+    unknownVol = 0x52,
+    paramRangeError = 0x53,
+    outOfMem = 0x54,
+    dupVolume = 0x57,
+    notBlockDev = 0x58,
+    damagedBitMap = 0x5a,
+    badPathNames = 0x5b,
+    notSystemFile = 0x5c,
+    osUnsupported = 0x5d,
+    stackOverflow = 0x5f,
+    dataUnavail = 0x60,
+    endOfDir = 0x61,
+    invalidClass = 0x62,
+    resForkNotFound = 0x63,
+    invalidFSTID = 0x64,
+    devNameErr = 0x67,
+    resExistsErr = 0x70,
+    resAddErr = 0x71
+};
 
 class Exception : public std::exception
 {