diff --git a/scans/README.md b/scans/README.md
index d0f0555..f468ecc 100644
--- a/scans/README.md
+++ b/scans/README.md
@@ -55,6 +55,7 @@ Details of the files:
 * lcase.b: page 4 of 08-rest.pdf
 * ed1.s: pages 7-20 of 08-rest.pdf
 * ed2.s: pages 21-29 of 08-rest.pdf
+* fop.s pages 1-14 of 09-1-35.pdf
 * ln.s pages 15-16 of 09-1-35.pdf
 * ls.s pages 17-21 of 09-1-35.pdf
 * nm.s pages 31-34 of 09-1-35.pdf
diff --git a/scans/fop.s b/scans/fop.s
new file mode 100644
index 0000000..6d4111b
--- /dev/null
+++ b/scans/fop.s
@@ -0,0 +1,816 @@
+"** 09-1-35.pdf page 1
+jms = 0100000
+"
+q:0
+fmp = jms q
+
+  lac i q
+  garg
+  isz q
+  -1
+  tad aexp
+  tad hexp
+  dac aexp
+  lac ans
+  lmq
+  lac ams
+  sna cll
+  jmp 2f
+  lls 1
+  dac 3f
+  dac 4f
+  lacq
+  dac 1f
+  lac hls
+  lmq
+  lac hms
+  sna cll
+  jmp 2f
+  lls 1
+  dac hms
+  lacq
+  dac hls
+  lac hms
+  mul
+1:0
+  dac ans
+  lacq
+  dac ce10
+  lac hls
+  mul
+3:0
+  dac ams
+  lacq
+  tad ce10
+  glk
+  dzm ce10
+  tad ams
+  szl cll
+  isz ce10
+  tad ans
+  szl cll
+  isz ce10
+  dac ans
+  lac hms
+  mul
+4:0
+  dac ams
+  lacq
+  tad ans
+  szl cll
+  isz ce10
+  lmq
+  lac ce10
+"** 09-1-35.pdf page 2
+  tad ams
+  sma
+  jmp 5f
+  isz aexp
+  nop
+  lrs 1
+5:xor rsign
+  dac ams
+  lacq
+  dac ans
+  jmp i q
+2:dzm aexp
+  dzm ams
+  dzm ans
+  jmp i q
+"
+q:0
+fdv = jms q
+  lac i q
+  garg
+  isz q
+  lac hms
+  sna
+  sys save
+  ral
+  dac 2f
+  dac 3f
+  dac 4f
+  -1
+  tad hexp
+  cma
+  tad aexp
+  dac aexp
+  lac ans
+  lmq
+  lac ams
+  sna cll
+  jmp 8f
+  div
+2:0
+  szl
+  sys save
+  dac ce10
+  lacq
+  dac 5f
+  lac ce10
+  frdiv
+3:0
+  szl
+  sys save
+  lacq
+  dac ce10
+  lac hls
+  and o377777
+  frdiv
+4:0
+  szl
+  sys save
+  lacq
+  dac 2b
+  spa cla
+"** 09-1-35.pdf page 3
+  -1
+  tad 2b
+  cll
+  mul
+5:0
+  dzm 2b
+  spa
+  isz 2b
+  lls 1
+  dac 3b
+  lacq
+  spa
+  isz 3b
+  skp
+  isz 2b
+  lac ce10
+  lmq
+  lac 3b
+  sna
+  jmp 6f
+  cma
+  tad d1
+  stl
+  tad ce10
+  lmq
+  szl
+  isz 2b
+6:lac 2b
+  sma
+  tad d1
+  tad 5b
+  sma cll
+  jmp 7f
+  lrs 1
+  isz aexp
+  nop
+7:xor rsign
+  dac ams
+  lacq
+  dac ans
+  jmp i q
+8:dzm aexp
+  dzm ams
+  jmp i q
+
+q:0
+fad = jms q
+  lac i q
+  garg
+  isz q
+  lac hms
+  sna
+  jmp 4f
+  lac ams
+  sna
+  jmp 8f
+7:lac aexp
+  cma
+  tad hexp
+  sma
+  jmp 5f
+"** 09-1-35.pdf page 4
+  dac ce10
+  tad d34
+  spa cla
+  jmp 0f
+  lac ce10
+  cma
+  tad d1
+  xor o640500
+  dac 1f
+  lac hls
+  lmq
+  lac hms
+  cll
+1:lrs 0
+  dac hms
+  lacq
+  dac hls
+  lac rsign
+  sma
+  jmp 2f
+  lac hls
+  cll cma
+  tad d1
+  dac hls
+  lac hms
+  szl cma
+  tad d1
+  dac hms
+2:lac ams
+  rcr
+  dac ams
+  lac ans
+  rar
+  cll
+  tad hls
+  dac ans
+  glk
+  tad ams
+  tad hms
+  dac ams
+  sma
+  jmp 3f
+  lac ans
+  cma cll
+  tad d1
+  dac ans
+  lac ams
+  szl cma
+  tad d1
+  dac ams
+  lac o400000
+3:isz aexp
+  nop
+0:xor asign
+  and o400000
+  dac rsign
+  fno
+4:lac ams
+  xor rsign
+  dac ams
+  jmp i q
+"** 09-1-35.pdf page 5
+5:jms 6f
+  lac rsign
+  xor asign
+  dac asign
+  jmp 7b
+8:jms 6f
+  jmp 4b
+6:0
+  lac ans
+  lmq
+  lac hls
+  dac ans
+  lacq
+  dac hls
+  lac ams
+  lmq
+  lac hms
+  dac ams
+  lacq
+  dac hms
+  lac hexp
+  lmq
+  lac aexp
+  dac hexp
+  lacq
+  dac aexp
+  jmp i 6b
+"
+q:0
+fno = jms q
+  lac and
+  sad ams
+  sza cll
+  jmp 1f
+  dzm aexp
+  dzm rsign
+  jmp i q
+ "
+1:lmq
+  lac ams
+  and o200000
+  sza
+  jmp i q
+  lac ams
+  cll
+  norm 36
+  dac ams
+  lacq
+  dac ans
+  lacs
+  tad o777743
+  cma
+  tad aexp
+  dac aexp
+  jmp i q
+"
+q:0
+fcp = jms q
+  lac i q
+  garg
+  isz q
+"** 09-1-35.pdf page 6
+  lac rsign
+  spa
+  jmp 1f
+  lac ams
+  dac 5f
+  xor asign
+  dac ams
+  sna
+  jmp 2f
+  lac hms
+  sna cma
+  jmp 3f
+  lac hexp
+  cma
+  tad d1
+  tad aexp
+  sza
+  jmp 4f
+2:lac hms
+  cma
+3:tad d1
+  tad 5f
+  sza
+  jmp 4f
+  lac hls
+  cma
+  tad d1
+  tad ans
+  sza
+4:xor asign
+  jmp i q
+1:lac ams
+  xor d1
+  jmp i q
+5:0
+
+q: 0
+garg = jms q
+   tad dm1
+   dac 8
+   lac i 8
+   dac hexp
+   lac i 8
+   lmq
+   and o377777
+   dac hms
+   lac i 8
+   dac hls
+   lacq
+   xor ams
+   and o400000
+   dac rsign
+   lac ams
+   and o400000
+   dac asign
+   lac ams
+   and 0377777
+   dac ams
+   jmp i q
+
+q: 0
+"** 09-1-35.pdf page 7
+sfmp = jms q
+  lac i q
+  garg
+  isz q
+   -1
+  tad aexp
+  tad hexp
+  dac aexp
+   lac ams
+   sna rcl
+   jmp 2f
+   lmq
+   lac hms
+   sna rcl
+   jmp 2f
+   dac .+2
+   0641122; 0
+   sma
+   jmp 1f
+   rcr
+   xor rsign
+   dac ams
+   isz aexp
+   jmp i q
+   jmp i q
+1:
+   xor rsign
+   dac ams
+   jmp i q
+2:
+   dzm aexp
+  dzm ams
+  jmp i q
+
+q: 0
+sfdv = jms q
+   lac i q
+   garg
+   isz q
+   lac hexp
+   cma
+   tad aexp
+   tad d1
+   dac aexp
+   lac hms
+   sna ral cll
+   sys save
+   dac 1f
+   lac ams
+   frdiv; 1: 0
+   szl
+   sys save
+   lacq
+   spa
+   jmp 1f
+   xor rsign
+   dac ams
+   jmp i q
+1:
+   rcr
+   xor rsign
+"** 09-1-35.pdf page 8
+   dac ams
+   isz aexp
+   jmp i q
+   jmp i q
+q:0
+   sfad = jms q
+   -1
+   tad i q
+   isz q
+   dac 8
+   lac i 8
+   dac hexp
+   lac i 8
+   sma
+   jmp 1f
+   xor o377777
+   tad d1
+1:
+   lrss 1
+   dac hms
+   lac ams
+   sma
+   jmp 1f
+   xor o377777
+   tad d1
+1:
+   lrss 1
+   dac ams
+   lac hexp
+   cma
+   tad aexp
+   tad d1
+   sma
+   jmp 1f
+   cma
+   tad d1
+   dac tmp
+   lac ams
+   lmq
+   lac hms
+   dac ams
+   lacq
+   dac hms
+   lac hexp
+   dac aexp
+   lac tmp
+1:
+   tad dm18
+   sma
+   jmp 3f
+   tad o660522
+   dac 1f
+   lac hms
+1:
+   lrss 0
+   dzm rsign
+   tad ams
+   cll sma
+   jmp 1f
+   lmq
+   and o400000
+"** 09-1-35.pdf page 9
+   dac rsign
+   lacq
+   cma
+   tad d1
+   cll sma
+   jmp 1f
+   isz aexp
+   nop
+   rar
+1:
+   sna
+   jmp 1f
+   norm 18
+   xor rsign
+   dac ams
+   lacs
+   tad om60
+   cma
+   tad aexp
+   dac aexp
+   jmp i q
+1:
+   dzm aexp
+   dzm ams
+   jmp i q
+3:
+   lac ams
+   rcl
+   sma
+   jmp 1f
+   cma
+   tad d1
+   xor o400000
+1:
+   dac ams
+   jmp i q
+q: 0
+fld = jms q
+   -1
+   tad i q
+   dac 8
+   lac i 8
+   dac aexp
+   lac i 8
+   dac ams
+   lac i 8
+   dac ans
+   isz q
+   jmp i q
+
+q: 0
+fst = jms q
+   -1
+   tad i q
+   dac 8
+   lac aexp
+   dac i 8
+   lac ams
+   dac i 8
+   lac ans
+   dac i 8
+"** 09-1-35.pdf page 10
+   isz q
+   jmp i q
+
+q: 0
+fng = jms q
+   lac ams
+   sza
+   xor o400000
+   dac ams
+   jmp i q
+
+q: 0
+fix = jms q
+   lac aexp
+   spa sna
+   jmp 1f
+   tad dm18
+   sma
+   jmp 3f
+   cma
+   tad o660500
+   dac 2f
+   lac ams
+   sma
+   jmp 2f
+   xor o377777
+   tad d1
+2:
+   lrss 0
+   jmp i q
+1:
+   lac ams
+   lrss 18
+   jmp i q
+3:
+   lac ams
+   and o400001
+   sma
+   lac o377777
+   jmp i q
+
+q: 0
+flt = jms q
+   dac tmp
+   dzm ans
+   sma
+   jmp 1f
+   cma
+   tad d1
+   spa
+   cla
+1:
+   sza
+   jmp 1f
+   dzm aexp
+   dzm ams
+   jmp 2f
+1:
+   clq
+   norm 36
+   dac ams
+"** 09-1-35.pdf page 11
+   lacs
+   tad om56
+   cma
+   dac aexp
+2:
+   lac tmp
+   and o400000
+   xor ams
+   dac ams
+   jmp i q
+
+tmp: 0
+stmp: 0
+ce10: 0
+asign: 0
+aexp: 0
+ams: 0
+ans: 0
+hexp: 0
+hms: 0
+hls: 0
+
+q: 0
+sin = jms q
+   lac ams
+   and o400000
+   dac sign
+   lac ams
+   and o377777
+   dac ams
+   fst; ftmp1
+   fdv; fpi
+   fix
+   dac stmp
+   and d1
+   sna
+   jmp 1f
+   lac o400000
+   xor sign
+   dac sign
+1:
+   lac stmp
+   flt
+   fmp; fpi
+   fng
+   fad; ftmp1
+   fst; strm
+   fst; sres
+   fst; ftmp2
+   fld; fp1
+   fst; sfac
+   -6
+   dac scnt
+1:
+bsin:
+   fld; sfac
+   fad; fp1
+   fst; ftmp1
+   fad; fp1
+   fst; sfac
+   fld; strm
+"** 09-1-35.pdf page 12
+   fmp; ftmp2
+   fmp; ftmp2
+   fdv; sfac
+   fdv; ftmp1
+   fng
+   fst; strm
+   fad; sres
+   fst; sres
+   isz scnt
+   jmp 1b
+   lac ams
+   xor sign
+   dac ams
+   jmp i q
+
+q: 0
+sqrt = jms q
+   lac aexp
+   tad d1
+   llss 0
+   rar
+   dac aexp
+   lac ans
+   lmq
+   lac ams
+   spa
+   sys save
+   dac 1f
+   snl
+   jmp 5f
+   lls 1
+   dac ams
+   lacq
+   dac ans
+5:
+   lac 1f
+   sna
+   jmp q i
+   snl cll
+   xor o200000
+   xor o400000
+   dac 1f
+   lac ams
+   frdiv; 1:..
+   szl
+   clq
+   lacq
+   tad 1b
+   rar
+   cll
+   dac 2f
+   lac ams
+   frdiv; 2:..
+   szl
+   clq
+   lacq
+   tad 2b
+   rar
+   dac 3f
+   dac 4f
+   lac ans
+"** 09-1-35.pdf page 13
+   lmq
+   lac ams
+   cll
+   div; 3:..
+   szl
+   clq ecla
+   dac 1b
+   lacq
+   tad 3b
+   clq lrs 1
+   cll
+   lrs 1
+   dac ams
+   lacq
+   dac 2b
+   lac 1b
+   frdiv; 4:..
+   szl
+   sys save
+   lacq
+   lrs 2
+   tad 2b
+   dac ans
+   jmp q i
+
+sfac: 0;0;0
+ftmp1: 0;0;0
+ftmp2: 0;0;0
+strm: 0;0;0
+scnt: 0
+sres: 0;0;0
+rsign: 0
+sign: 0
+
+fp1: 1;0200000; 0
+
+o400000: 0400000
+o640500: 0640500
+o200000: 0200000
+d34: 34
+o777743: o777743
+o2: 02
+o377777: 0377777
+dm18: -18
+o377777: 0377777
+om60: -060
+o660522: 0660522
+o660500: 0660500
+o400001: 0400001
+dm1: -1
+om56: -056
+fpi: 2;0311037; 0552421
+fpid2: 1; 0311037;0552421
+buf:
+cgarg = garg-jms
+cfmp = fmp-jms
+cfdv = fdv-jms
+cfad = fad-jms
+cfno = fno-jms
+cfcp = fcp-jms
+csfmp = sfmp-jms
+"** 09-1-35.pdf page 14
+csfdv = sfdv-jms
+csfad = sfad-jms
+cfld = fld-jms
+cfst = fst-jms
+cfng = fng-jms
+cfix = fix-jms
+cflt = flt-jms
+csin = sin-jms