MZ is back!HEADmain

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diff --git a/v4.0/src/DOS/CRIT.ASM b/v4.0/src/DOS/CRIT.ASM
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+;       SCCSID = @(#)crit.asm   1.1 85/04/10
+TITLE CRIT - Critical Section Routines
+NAME  CRIT
+;
+; Critical Section Routines
+;
+;   Critical section handlers
+;
+;   Modification history:
+;
+;       Created: ARR 30 March 1983
+;
+
+.xlist
+;
+; get the appropriate segment definitions
+;
+include dosseg.asm
+
+CODE    SEGMENT BYTE PUBLIC  'CODE'
+        ASSUME  SS:NOTHING,CS:DOSGROUP
+
+.xcref
+INCLUDE DOSSYM.INC
+.cref
+.list
+
+        I_need  User_In_AX,WORD
+        i_need  CurrentPDB,WORD
+if debug
+        I_need  BugLev,WORD
+        I_need  BugTyp,WORD
+include bugtyp.asm
+endif
+
+Break   <Critical section handlers>
+
+;
+;   Each handler must leave everything untouched; including flags!
+;
+;   Sleaze for time savings:  first instruction is a return.  This is patched
+;   by the sharer to be a PUSH AX to complete the correct routines.
+;
+Procedure   EcritDisk,NEAR
+        public  EcritMem
+        public  EcritSFT
+ECritMEM    LABEL   NEAR
+ECritSFT    LABEL   NEAR
+        RET
+;       PUSH    AX
+        fmt     TypSect,LevReq,<"PDB $x entering $x">,<CurrentPDB,sect>
+        MOV     AX,8000h+critDisk
+        INT     int_ibm
+        POP     AX
+        return
+EndProc EcritDisk
+
+Procedure   LcritDisk,NEAR
+        public  LcritMem
+        public  LcritSFT
+LCritMEM    LABEL   NEAR
+LCritSFT    LABEL   NEAR
+        RET
+;       PUSH    AX
+        fmt     TypSect,LevReq,<"PDB $x entering $x">,<CurrentPDB,sect>
+        MOV     AX,8100h+critDisk
+        INT     int_ibm
+        POP     AX
+        return
+EndProc LcritDisk
+
+Procedure   EcritDevice,NEAR
+        RET
+;       PUSH    AX
+        fmt     TypSect,LevReq,<"PDB $x entering $x">,<CurrentPDB,sect>
+        MOV     AX,8000h+critDevice
+        INT     int_ibm
+        POP     AX
+        return
+EndProc EcritDevice
+
+Procedure   LcritDevice,NEAR
+        RET
+;       PUSH    AX
+        MOV     AX,8100h+critDevice
+        INT     int_ibm
+        POP     AX
+        return
+EndProc LcritDevice
+
+CODE    ENDS
+    END