{}
{  The purpose of this request is to lock those pages in memory that
{ were allocated for the buffers involved with any data transfers. The
{ necessary real memory addresses required by the PP are derived and
{ placed in the appropriate interface tables and parameter areas.
{ Finally, the unit request queue lockword is set, the request placed
{ on the unit queue, and the lockword is cleared.  This procedure
{ executes in monitor mode.
{}
{       IOP$TAPE_QUEUE_REQUEST (REQUEST_BLOCK)
{}
{ REQUEST_BLOCK: (input) This parameter provides the request block that
{       is placed in the unit request queue.  The request block also
{       provides the descriptors for any data transfers and any further
{       parameter areas.
{}
