{
{
{      This request will locate a given byte address. The files system
{     buffers are searched first.  If the byte address is found, the
{     system buffer is positioned to the byte address.  If the byte
{     address is not found in the systen buffer descriptor chain, a
{     system buffer is assigned to contain the byte address and the
{     associated system buffer descriptor is linked into the system
{     buffer desriptor chain.
{
{  BAP$LOCATE_SB ( KFT_DESCRIPTOR,BYTE_ADDRESS,SBD_PTR,STATUS)
{
{    KFT_DESCRIPTOR : (input) this parameter specifies the known file
{                      table entry.
{
{    BYTE_ADDRESS : (input) this parameter specifies the byte address to
{                    which to locate.
{
{    SBD_PTR : (input) this parameter specifies a pointer to the system
{               buffer descriptor that can be released if necessary. if
{               NIL, the current system buffer will be released if nec-
{               essary.
{
{             (output) this parameter specifies a pointer to the system
{              buffer descriptor of the system buffer containing the byte
{              address.
{
{    STATUS : (output) this parameter specifies request status.
{
