procedure send_ch(ch:char);
var was_sent : char;
    count : integer;
begin
  if (mode = CW) AND (ch = #13) then ch := #32;
  if (mode = CW) OR (mode = RTTY) OR (mode = AMTOR)
    then ch := UpCase(ch);
  send_interrupt := FALSE;
  kam_out(ch);
  COUNT := TIMEOUT;
  repeat
    repeat
      delay(10);
      chk_kbd;
      DEC(COUNT);
    until (send_interrupt = TRUE) OR
          (char_ready = TRUE)     OR
          (COUNT = 0)             OR
          (state = receive);
    if (char_ready = TRUE)
      then was_sent := kam_in
      else was_sent := ch;
  until was_sent = ch;
end;

procedure send_char(ch: char);
begin
  attr_pos := 80*(yout - 1) + xout - 1;
  if (attr_pos > lead_attr ) then
    video^[attr_pos].a := xmt_attrib;
  xout := xout + 1;
  if xout > scrn_width then
  begin
    xout := 1;
    yout := yout + 1;
  end;
  attr_pos := 80*(yout - 1) + xout - 1;
  if (yout in [out_start_line .. out_end_line]) then
    video^[attr_pos].a := status_attrib;
  if (ch <> #13)
    then send_ch(ch)
    else if ((mode = PACKET) OR
             (mode = RTTY) OR
             (mode = AMTOR) )
           then send_ch(ch);
  if ch = #13 then
  begin
    attr_pos := 80*(yout - 1) + xout - 1;
    if (attr_pos > lead_attr ) then
      video^[attr_pos].a := xmt_attrib;
    yout := yout + 1;
    xout := 0;
  end;
end;

procedure send_file;
label  file_done;
var filename : string;
    filespec : file of byte;
    filebuff : array[1..2048] of byte;
    chr_pntr,nbr_chr : integer;
    file_chr : char;
    Escape : boolean;
    anykey,EscKey : char;
    diskIOresult : integer;

  procedure more_data;
  begin
    nbr_chr := 0;
    while (NOT Eof(filespec) AND (nbr_chr < 2048)) do
    begin
      inc(nbr_chr);
      read(filespec,filebuff[nbr_chr]);
    end;
    chr_pntr := 0;
  end;

  procedure next_char;
  begin
    chr_pntr := chr_pntr + 1;
    if (chr_pntr > nbr_chr) then more_data;
    if keypressed then EscKey := readkey;
    if EscKey = #27 then
      if keypressed then EscKey := readkey
                    else Escape := TRUE;
  end;

begin
  Escape := FALSE;
  stop_flag := FALSE;
  EscKey := ' ';
  filename := '';
  Set_PickWindow_To(10,5,25,22,SingleLine,'Files');
  SayGet(25,aux_line,'Text File (or ?) ',filename,_S,24,1);
  WatchKeys := ['?'];
  ReadGets;
  if LastKey = '?' then filename := PickFile('*.*');
  gotoxy(25,aux_line); aux_color; ClrEol;
  if filename <> '' then
  begin
    write('FILE XMT : ',filename,'   <ESC> to abort');
    assign(filespec,filename);
    {$I-}
    reset(filespec);
    diskIOresult := IOresult;
    {$I+}
    if (diskIOresult > 1)
    then begin
        gotoxy(25,aux_line); aux_color; ClrEol;
        write('File I/O Error ',filename);
        delay(3000);
      end
    else
    repeat
      more_data;
      if (Escape = TRUE) OR (nbr_chr = 0)
        then goto file_done;
      repeat
        inc(chr_pntr);
        file_chr := chr(filebuff[chr_pntr]);
        if (Escape = TRUE) OR (file_chr = ^Z) then goto file_done;
        if (file_chr in [#07,#13,' '..'z']) then
        begin
          add_char(file_chr);
          out_ptr := (out_ptr + 1) AND buf_size;
          send_char(kbd_buffer[out_ptr]);
        end;
        if (Escape = TRUE) then goto file_done;
      until chr_pntr = nbr_chr;
    until  Escape = TRUE;
file_done:
    close(filespec);
  end;
  gotoxy(25,aux_line); aux_color; ClrEol;
end;

procedure halt_xmt;
begin
  stop_flag := TRUE;
  clean_up_display;
  if (attr_pos > lead_attr ) then
    video^[attr_pos].a := xmt_attrib;
  inp_ptr := out_ptr;
  xout := xkbd - 1;
  yout := ykbd;
{ clear_buffer; }
  rcv_mode;
  case state of
    transmit : state := receive;
    transceive : ;
  end;
  sho_status;
end;

procedure xmtg;
begin
  if (xmt_ON = FALSE) then
    if mode in [CW,RTTY,ASCII] then
    begin
      xmt_mode;
      sho_status;
    end;
  if (inp_ptr = out_ptr) AND (auto_switch = TRUE) then
    begin
      case mode of
        CW     :  xmt_time_out := cw_off_delay;
        AMTOR,
        ASCII,
        RTTY,
        PACKET : xmt_time_out := xmt_off_delay;
      end;
      while (   (xmt_time_out > 0)
            AND (out_ptr = inp_ptr)
            AND (send_INTERRUPT = FALSE) ) do
        begin
          delay(100);
          xmt_time_out := xmt_time_out - 1;
          chk_kbd;
        end;
      if (out_ptr = inp_ptr) then
      begin
        halt_xmt;
        exit;
      end;
    end;
  if (out_ptr <> inp_ptr) then
  begin
    out_ptr := (out_ptr + 1) AND buf_size;
    send_char(kbd_buffer[out_ptr]);
  end;
end;