diff --git a/scans/Readme b/scans/Readme
index 045e708..2a67a55 100644
--- a/scans/Readme
+++ b/scans/Readme
@@ -6,4 +6,5 @@ For modified versions of these files, look in src/cmds and src/sys.
 
 Details of the files:
 
-s1.s: pages 2-3 of 01-s1.pdf, incomplete and with some cruft at the end
+s1.s: pages 2-3    of 01-s1.pdf, incomplete and with some cruft at the end
+cat.c: pages 21-23 of 06-5-12.pdf
diff --git a/scans/cat.s b/scans/cat.s
new file mode 100644
index 0000000..0f86597
--- /dev/null
+++ b/scans/cat.s
@@ -0,0 +1,145 @@
+" cat
+
+   lac 017777 i
+   sad d4
+   jmp nofiles
+   lac 017777
+   tad d1
+   tad d4
+   dac name
+
+loop:
+   sys open; name; 0; 0
+   spa
+   jmp badfile
+   dac fi
+
+1:
+   jms getc
+   sad o4
+   jmp 1f
+   jms putc
+   jmp 1b
+
+1:
+   lac fi
+   sys close
+
+loop1:
+   -4
+   tad 017777 i
+   dac 017777 i
+   sad d4
+   jmp done
+   lac name
+   tad d4
+   dac name
+   jmp loop
+
+badfile:
+   lac name
+   dac 1f
+   lac d8
+   sys write; 1:0; 4
+   lac d8
+   sys write; 1f; 2
+   jmp loop1
+
+1: 040;077012
+nofiles:
+   lac d8
+   sys write; 1f; 5
+   sys exit
+
+1: <no>; 040;  <fi>;<le>;<s 012
+
+done:
+   lac noc
+   sns
+   sys exit
+   and d1
+   sna cla
+   jmp 1f
+   jms putc
+   jmp done
+1:
+   lac noc
+   rcr
+   dac 1f
+   lac fo
+   sys write; iopt+1; 1:..
+   sys exit
+
+getc: 0
+   lac ipt
+   sad eipt
+   jmp 1f
+   dac 1f
+   add o400000
+   dac ipt
+   ral
+   lac 2f i
+   szl
+   lrss 9
+   and o177
+   sna
+   jmp getc+1
+   jmp getc i
+1:
+   lac fi
+   sys read; iipt+1; 64
+   sna
+   jmp 1f
+   tad iipt
+   dac eipt
+   lac iipt
+   dac ipt
+   jmp getc+1
+1:
+   lac 64
+   jmp getc i
+
+putc: 0
+   and o177
+   dac 2f+1
+   lac opt
+   dac 2f
+   add o400000
+   dac opt
+   spa
+   jmp 1f
+   lac 2f i
+   xor 2f+1
+   jmp 3f
+1:
+   lac 2f+1
+   alss 9
+3:
+   dac 2f i
+   isz noc
+   lac noc
+   sad d128
+   skp
+   jmp putc i
+   lac fo
+   sys write; iopt+1; 64
+   lac iopt
+   dac opt
+   dzm noc
+   jmp putc i
+2: 0;0
+ipt: 0
+eipt: 0
+iipt: .+1; .=.+64
+fi: 0
+opt: .+2
+iopt: .+1; .=.+64
+noc: 0
+fo: 1
+
+d1: 1
+o4:d4: 4
+d8: 8
+o400000: 0400000
+o177: 0177
+d128: 128