// (c)  Copyright:   Martin Richards   June 1991
// IOHDR
  
MANIFEST
$( char_bs  = 8

   // Stream control block.
   id_inscb      = 1
   id_outscb     = 2

   scb_pos       = 0
   scb_end       = 1
   scb_file      = 2
   scb_id        = 3
   scb_work      = 4
   scb_rdfn      = 5
   scb_wrfn      = 6
   scb_endfn     = 7
   scb_buf       = 8                         // Start of buffer
   scb_bufstart  = scb_buf*bytesperword      // first buf byte offset
   scb_buflen    = 2048    // changed from 1024 on 24 Nov 1995
   scb_bufend    = scb_bufstart+scb_buflen-1 // last buf byte offset
   scb_upb       = scb_bufend/bytesperword
$)