diff --git a/scans/s1.s b/scans/s1.s
index d9e639e..3a8fead 100644
--- a/scans/s1.s
+++ b/scans/s1.s
@@ -133,7 +133,7 @@ swp:
    .save; .getuid; .open; .read; .write; .creat; .seek; .tell
    .close; .link; .unlink; .setuid; .rename; .exit; .time; .intrp
    .chdir; .chmod; .chown; badcal; .sysloc; badcal; .capt; .rele
-   .status; badcal; .sems; .rmes; .fork
+   .status; badcal; .smes; .rmes; .fork
 swn:
     .-swp-1 i
 
@@ -144,7 +144,7 @@ swn:
 
 .sysloc:
    lac u.ac
-   and o1777
+   and o17777
    jms betwen; d1; locn
       jms error
    tad locsw
diff --git a/scans/s2.s b/scans/s2.s
index 89fe2c4..5c51afc 100644
--- a/scans/s2.s
+++ b/scans/s2.s
@@ -30,7 +30,7 @@
 .rele:
    dzm u.dspbuf
    law dspbuf
-   jsp movdsp
+   jms movdsp
    jmp sysexit
 
 .chmod:
@@ -123,7 +123,7 @@
    tad i.nlks
    dac i.nlks
 "** 01-s1.pdf page 9
-   jms imput
+   jms iput
    jms dput
    jms okexit
 
@@ -289,7 +289,7 @@ open1:
    lac f.badd
 1:
    jms iread; ..; ..
-   jmp exitrq
+   jmp exitrw
 
 .write:
    jms arg
diff --git a/scans/s3.s b/scans/s3.s
index 29b7d21..6ca7b28 100644
--- a/scans/s3.s
+++ b/scans/s3.s
@@ -72,7 +72,7 @@ lookfor: 0
 t= t+1
 
 badcal:
-   calon
+   clon
    -1
    dac 7
 .save:
@@ -195,7 +195,7 @@ swr:
 sww:
    jmp .-4 i
    .halt; rttyi; rkbdi; rppti; .halt
-   .halt; wttyo; wskpo; wppto
+   .halt; wttyo; wdspo; wppto
 
 .halt: jms halt
 
@@ -203,7 +203,7 @@ rttyi:
    jms chkint1
    lac d1
    jms getchar
-      jmp1f
+      jmp 1f
    and o177
    jms betwen o101; o132
    skp
@@ -225,7 +225,7 @@ wttyo:
    spa
    jmp 1f
    xor 0400000
-   dac dfiles+1
+   dac sfiles+1
    lacq
    tls
    sad o12
@@ -242,7 +242,7 @@ wttyo:
    jms swap
    jmp wttyo
 
-rkdbi:
+rkbdi:
    jms chkint1
    lac d2
    jms getchar
@@ -298,7 +298,7 @@ rppti:
    jms getchar
       jmp .+3
    alss 9
-   jmp apssone
+   jmp passone
    lac sfiles+3
    sma
    rsa
@@ -342,7 +342,7 @@ passone:
 
 error: 0
    -1
-   sac u.ac
+   dac u.ac
    jmp sysexit
 
 chkint1: 0
diff --git a/scans/s4.s b/scans/s4.s
index 6c2ceeb..c4cdfbf 100644
--- a/scans/s4.s
+++ b/scans/s4.s
@@ -31,7 +31,7 @@ alloc: 0
 
 free: 0
    lmq
-   lac x.nfblks
+   lac s.nfblks
    sad d10
    jmp 1f
    tad fblksp
@@ -42,7 +42,7 @@ free: 0
    isz s.nfblks
    jmp free i
 1:
-   lac x.nxfblk
+   lac s.nxfblk
    dac dskbuf
    jms copy; s.fblks+1; dskbuf+1; 9
    lacq
@@ -57,7 +57,7 @@ t = t+1
 laci: 0
    and o1777
    tad o200000
-   dac ._1
+   dac .+1
    lac ..
    jmp laci i
 
@@ -90,7 +90,7 @@ copy: 0
    dac 8
    isz copy
    -1
-   tad copu i
+   tad copy i
    dac 9
    isz copy
    -1
@@ -128,10 +128,10 @@ putchar: 0
    cla
    jms takeq
       jmp putchar i
-   tad of0001
+   tad o40001
    dac .+4
    lac 9f+t
-   jms putc
+   jms putq
    lac char
    lac q2+1 ..
    isz putchar
@@ -211,7 +211,7 @@ srcdbs: 0
    law 65	"** crossed out
    tad 9f+t+1	"** crossed out isz 8 written
    isz 9f+t+1
-   isx 9f+t
+   isz 9f+t
    jmp 1b
    isz srcdbs
    jmp srcdbs i
@@ -228,8 +228,8 @@ collapse: 0
    tad d2	"** crossed out: original obscured
    dac 0f
    cma
-   rad d1
-   tad esdkbsp
+   tad d1
+   tad edskbsp
    and o17777
    sna
    jmp 0f+3
@@ -243,7 +243,7 @@ collapse: 0
    lac dskaddr
    dac 9f+t i
    jms copy; dskbuf; 0; ..; 64
-   jmp collaps i
+   jmp collapse i
 
 dskrd: 0
    jms betwen; d2; d7999
@@ -293,7 +293,7 @@ dskio: 0
    lac 9f+t
    idiv; 10
    dac 9f+t
-   ils 22
+   lls 22
    xor 9f+t
    jms dsktrans; -64; dskbuf; 9f+t; dskio
    isz dskio