Top secrets sources NedoPC pentevo

        ;**************************************************************
        ;
        ; The statement action routine - CLOCK
        ;
        ;**************************************************************
        ;
SCLOCK: ACALL   OTST            ;GET CHARACTER AFTER CLOCK TOKEN
        CLR     ET0
        CLR     C_BIT
        JNC     SC_R            ;EXIT IF A ZERO
        ANL     TMOD,#0F0H      ;SET UP THE MODE
        SETB    C_BIT           ;USER INTERRUPTS
        ORL     IE,#82H         ;ENABLE ET0 AND EA
        SETB    TR0             ;TURN ON THE TIMER
        ;
SC_R:   RET
        ;