diff --git a/kernel/branches/net/macros.inc b/kernel/branches/net/macros.inc
index 482d8e45f0..ad328c4f9e 100644
--- a/kernel/branches/net/macros.inc
+++ b/kernel/branches/net/macros.inc
@@ -117,3 +117,83 @@ macro list_del entry
         mov     [ecx+list_fd], edx
 }
 
+
+
+if __CPU_type eq p5             ; CMOVcc isnt supported on the P5
+
+cmove   fix     cmovz
+macro cmovz reg1, reg2 {
+
+local   .jumpaddr
+
+        jnz     .jumpaddr
+        mov     reg1, reg2
+       .jumpaddr:
+}
+
+cmovne  fix     cmovnz
+macro cmovnz reg1, reg2 {
+
+local   .jumpaddr
+
+        jz      .jumpaddr
+        mov     reg1, reg2
+       .jumpaddr:
+}
+
+macro cmovg reg1, reg2 {
+
+local   .jumpaddr
+
+        jle     .jumpaddr
+        mov     reg1, reg2
+       .jumpaddr:
+}
+
+macro cmovl reg1, reg2 {
+
+local   .jumpaddr
+
+        jge     .jumpaddr
+        mov     reg1, reg2
+       .jumpaddr:
+}
+
+macro cmova reg1, reg2 {
+
+local   .jumpaddr
+
+        jbe     .jumpaddr
+        mov     reg1, reg2
+       .jumpaddr:
+}
+
+macro cmovb reg1, reg2 {
+
+local   .jumpaddr
+
+        jae     .jumpaddr
+        mov     reg1, reg2
+       .jumpaddr:
+}
+
+macro cmovae reg1, reg2 {
+
+local   .jumpaddr
+
+        jb     .jumpaddr
+        mov     reg1, reg2
+       .jumpaddr:
+}
+
+macro cmovbe reg1, reg2 {
+
+local   .jumpaddr
+
+        ja     .jumpaddr
+        mov     reg1, reg2
+       .jumpaddr:
+}
+
+end if
+
diff --git a/kernel/branches/net/network/tcp.inc b/kernel/branches/net/network/tcp.inc
index e4beeeeb71..1a50319f28 100644
--- a/kernel/branches/net/network/tcp.inc
+++ b/kernel/branches/net/network/tcp.inc
@@ -134,7 +134,7 @@ include 'tcp_output.inc'
 ;
 ; TCP_API
 ;
-; This function is called by system function 75
+; This function is called by system function 76
 ;
 ; IN:  subfunction number in bl
 ;      device number in bh
diff --git a/kernel/branches/net/network/tcp_input.inc b/kernel/branches/net/network/tcp_input.inc
index 6e13d613da..ca1545cc95 100644
--- a/kernel/branches/net/network/tcp_input.inc
+++ b/kernel/branches/net/network/tcp_input.inc
@@ -966,7 +966,7 @@ align 4
 
         mov     eax, [ebx + TCP_SOCKET.SND_WND]
         cmp     eax, [ebx + TCP_SOCKET.SND_CWND]
-        cmovg   eax, [ebx + TCP_SOCKET.SND_CWND]
+        cmova   eax, [ebx + TCP_SOCKET.SND_CWND]
         shr     eax, 1
         push    edx
         xor     edx, edx
@@ -1108,7 +1108,7 @@ align 4
         pop     ecx
 
         cmp     esi, eax
-        cmovg   esi, eax
+        cmova   esi, eax
         mov     [ebx + TCP_SOCKET.SND_CWND], esi