initial commit / add all books

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diff --git a/2522/CH12/EX12.3/exm12_3.sce b/2522/CH12/EX12.3/exm12_3.sce
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+// page no 375

+// example no 12.3

+// CHECK PENDING INTERRUPT

+clc;

+printf('RIM instruction interpretation \n \n');

+printf('D7=SID                      Serial input data if any \n');

+printf('D6,D5,D4= I7.5,I6.5,I5.5    Pending interrupts: 1= pending \n');

+printf('D3=IE                       Interrupt enable flag: 1= enabled \n');

+printf('D2,D1,D0= M7.5,M6.5,M5.5    Interrupt masks: 1= masked \n \n \n');

+

+

+printf('Instructions \n \n');

+printf('        RIM \n');            // Read interrupt mask

+printf('        MOV B,A \n');        // save mask information

+printf('        ANI 20H \n');        // check whether RST 6.5 is pending

+printf('        JNZ NEXT \n');

+printf('        EI \n');

+printf('        RET \n');           // RST 6.5 is not pending, return to main program

+printf('NEXT:   MOV A,B \n');       // get bit pattern; RST 6.5 is pending

+printf('        ANI 0DH \n');       // enables RST 6.5 by setting D1=0

+printf('        ORI 08H\n');        // enable SIM by setting D3=1

+printf('        SIM \n');

+printf('        JMP SERV \n');      // jump to service routine for RST 6.5