diff --git a/lib/MAKEFILE b/lib/MAKEFILE
index 3d9926c..ce1facc 100644
--- a/lib/MAKEFILE
+++ b/lib/MAKEFILE
@@ -1,7 +1,7 @@
 asm= lzasm /z/t
 lnk= elink
 
-all: detect.lib video.lib str0.lib bmp.lib graphic.lib 3d.lib
+all: detect.lib video.lib str0.lib bmp.lib graphic.lib 3d.lib math.lib
 
 .asm.obj: 
       $(asm) $<
diff --git a/lib/math.asm b/lib/math.asm
new file mode 100644
index 0000000..77cb89c
--- /dev/null
+++ b/lib/math.asm
@@ -0,0 +1,38 @@
+model tiny,stdcall
+p586
+locals
+jumps
+codeseg
+option procalign:byte
+
+include "..\include\mem.h"
+
+org 0h
+
+header exe <"CE",1,0,0,offset exports,,,>
+
+exporting
+declare random
+declare randomize
+ende
+
+randseed        dw 1234h 
+
+PROC random FAR
+    USES    dx
+    mov     ax,[cs:randseed]
+    mov     dx,8405h
+    mul     dx
+    inc     ax
+    mov     [cs:randseed],ax
+    mov     ax,dx
+    ret
+endp random
+
+PROC randomize FAR
+    USES    ax,cx,dx
+    mov     ah,0
+    int     1ah
+    mov     [cs:randseed],dx
+    ret
+endp randomize