diff --git a/map65/libm65/read_tf2.f90 b/map65/libm65/read_tf2.f90
index d89dd8753..cb6c5b1b5 100644
--- a/map65/libm65/read_tf2.f90
+++ b/map65/libm65/read_tf2.f90
@@ -1,50 +1,27 @@
 subroutine read_tf2(k)
 
   parameter (NFFT=32768)
+  integer*8 ms                              !ms since epoch
   integer k                                 !data sample pointer
   integer*2 id2(4,174)
-  character*80 fname(100)
-  logical first,eof
+  logical lopen
   real*8 fcenter
   common/datcom/dd(4,5760000),ss(4,322,NFFT),savg(4,NFFT),fcenter,nutc,junk(38)
-  data first/.true./,n1/0/
-  save
-
-  if(first) then
-     open(27,file='mockRTfiles.txt',status='old',err=999)
-     do i=1,100
-        read(27,1000,end=10) fname(i)
-1000    format(a)
-     enddo
-10   nfiles=i-1
-     ifile=0
-     close(27)
-  endif
+  data lopen/.false./
+  save lopen
 
   if(k.eq.0) then
-     ifile=ifile+1
-     if(ifile.eq.2 .and. n1.eq.1) ifile=1
-     if(ifile.eq.1) n1=n1+1
-     if(ifile.gt.nfiles) ifile=1
-     if(.not.first) close(27)
-     first=.false.
-     i1=index(fname(ifile),'.tf2')
-     read(fname(ifile)(i1-4:i1-1),*) nutc
-     open(27,file=fname(ifile),status='old',access='stream',err=999)
-     print*,ifile,n1,nutc,trim(fname(ifile))
-     eof=.false.
+     inquire(27,opened=lopen)
+     if(lopen) then
+        rewind 27
+     else
+        open(27,file='000000_0000.tf2',status='old',access='stream')
+     endif
      read(27) fcenter
   endif
-
-  if(eof) then
-     id2=0
-  else
-     read(27,end=20) id2
-  endif
-  go to 30
-20 eof=.true.
-  id2=0
-30 do i=1,174
+  
+  read(27,end=999) id2
+  do i=1,174
      k=k+1
      dd(1,k)=id2(1,i)
      dd(2,k)=id2(2,i)