List of Software Vectors
Vector              No     Description of vector
------------------- ------ ------------------------------------
UserV               (&00)  User (reserved)
ErrorV              (&01)  Error (OS_GenerateError)
IrqV                (&02)  Interrupt
WrchV               (&03)  Write character (OS_WriteC)
ReadCV              (&04)  Read character (OS_ReadC)
CLIV                (&05)  Command line interpreter (OS_CLI)
ByteV               (&06)  OS_Byte indirection (OS_Byte)
WordV               (&07)  OS_Word indirection (OS_Word)
FileV               (&08)  File read/write (OS_File)
ArgsV               (&09)  File arguments read/write (OS_Args)
BGetV               (&0A)  File byte read (OS_BGet)
BPutV               (&0B)  File byte put (OS_BPut)
GBPBV               (&0C)  File byte block get/put (OS_GBPB)
FindV               (&0D)  File open (OS_Find)
ReadLineV           (&0E)  Read a line of text (OS_ReadLine)
FSControlV          (&0F)  Filing system control (OS_FSControl)
EventV              (&10)  Event vector (OS_GenerateEvent)
InsV                (&14)  Buffer insert (OS_Byte)
RemV                (&15)  Buffer remove (OS_Byte)
CnpV                (&16)  Count/Purge Buffer (OS_Byte)
UKVDU23V            (&17)  Unknown VDU23 (OS_WriteC)
UKSWIV              (&18)  Unknown SWI (SWI)
UKPLOTV             (&19)  Unknown VDU25
MouseV              (&1A)  Mouse (OS_Mouse)
VDUXV               (&1B)  VDU (OS_WriteC)
TickerV             (&1C)  100Hz pacemaker
UpCallV             (&1D)  Warning vector
ChangeEnvironmentV  (&1E)  Environment change (OS_ChangeEnv..)
SpriteV             (&1F)  OS_SpriteOp indirection
DrawV               (&20)  Draw SWI (Draw_xx)
EconetV             (&21)  Econet activity (Econet_xx)
ColourV             (&22)  ColourTrans SWI (ColourTrans_xx)