diff --git a/lib/fst4/genfst240_64.f90 b/lib/fst4/genfst240_64.f90
deleted file mode 100644
index 378f8a035..000000000
--- a/lib/fst4/genfst240_64.f90
+++ /dev/null
@@ -1,108 +0,0 @@
-subroutine genfst240_64(msg0,ichk,msgsent,msgbits,i4tone,iwspr)
-
-! Input:
-!   - msg0     requested message to be transmitted
-!   - ichk     if ichk=1, return only msgsent
-!   - msgsent  message as it will be decoded
-!   - i4tone   array of audio tone values, {0,1,2,3}
-!   - iwspr    0: (240,101)/crc24, 1: (240,74)/crc24
-!
-! Frame structure:
-! s8 d30 s8 d30 s8 d30 s8 d30 s8
-
-   use packjt77
-   include 'fst240_params.f90'
-   character*37 msg0
-   character*37 message                    !Message to be generated
-   character*37 msgsent                    !Message as it will be received
-   character*77 c77
-   character*24 c24
-   integer*4 i4tone(NN),itmp(ND)
-   integer*1 codeword(2*ND)
-   integer*1 msgbits(101),rvec(77)
-   integer isyncword1(8),isyncword2(8)
-   integer ncrc24
-   integer graymap64(64)
-   logical unpk77_success
-   data isyncword1/3,1,4,0,6,5,2/
-   data rvec/0,1,0,0,1,0,1,0,0,1,0,1,1,1,1,0,1,0,0,0,1,0,0,1,1,0,1,1,0, &
-      1,0,0,1,0,1,1,0,0,0,0,1,0,0,0,1,0,1,0,0,1,1,1,1,0,0,1,0,1, &
-      0,1,0,1,0,1,1,0,1,1,1,1,1,0,0,0,1,0,1/
-   data graymap64/ 0, 1, 3, 2, 6, 7, 5, 4,12,13,15,14,10,11, 9, 8, &
-                  24,25,27,26,30,31,29,28,20,21,23,22,18,19,17,16, &
-                  48,49,51,50,54,55,53,52,60,61,63,62,58,59,57,56, &
-                  40,41,43,42,46,47,45,44,36,37,39,38,34,35,33,32/
-   message=msg0
-
-   do i=1, 37
-      if(ichar(message(i:i)).eq.0) then
-         message(i:37)=' '
-         exit
-      endif
-   enddo
-   do i=1,37                               !Strip leading blanks
-      if(message(1:1).ne.' ') exit
-      message=message(i+1:)
-   enddo
-
-   i3=-1
-   n3=-1
-   call pack77(message,i3,n3,c77)
-   call unpack77(c77,0,msgsent,unpk77_success) !Unpack to get msgsent
-   msgbits=0
-   iwspr=0
-   if(i3.eq.0.and.n3.eq.6) then
-      iwspr=1
-      read(c77,'(50i1)') msgbits(1:50)
-      call get_crc24(msgbits,74,ncrc24)
-      write(c24,'(b24.24)') ncrc24
-      read(c24,'(24i1)') msgbits(51:74)
-   else
-      read(c77,'(77i1)') msgbits(1:77)
-      msgbits(1:77)=mod(msgbits(1:77)+rvec,2)
-      call get_crc24(msgbits,101,ncrc24)
-      write(c24,'(b24.24)') ncrc24
-      read(c24,'(24i1)') msgbits(78:101)
-   endif
-
-   if(ichk.eq.1) go to 999
-   if(unpk77_success) go to 2
-1  msgbits=0
-   itone=0
-   msgsent='*** bad message ***                  '
-   go to 999
-
- entry get_fst240_tones_from_bits(msgbits,i4tone,iwspr)
-
-2  continue
-   if(iwspr.eq.0) then 
-      call encode240_101(msgbits,codeword)
-   else
-      call encode240_74(msgbits(1:74),codeword)
-   endif
-
-! Grayscale mapping:
-! bits   tone
-
-   do i=1,40
-      is=codeword(2*i)+2*codeword(2*i-1)
-      if(is.le.1) itmp(i)=is
-      if(is.eq.2) itmp(i)=3
-      if(is.eq.3) itmp(i)=2
-   enddo
-
-   i4tone(  1:  8)=isyncword1
-   i4tone(  9: 38)=itmp(  1: 30)
-   i4tone( 39: 46)=isyncword2
-   i4tone( 47: 76)=itmp( 31: 60)
-   i4tone( 77: 84)=isyncword1
-   i4tone( 85:114)=itmp( 61: 90)
-   i4tone(115:122)=isyncword2
-   i4tone(123:152)=itmp( 91:120)
-   i4tone(153:160)=isyncword1
-
-999 return
-
-end subroutine genfst240_64
-
-subroutine graycode(in