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// page no 327
// example no 10.7
// SUBROUTINE TO SET THE ZERO FLAG
clc;
printf('CHECK: PUSH H \n \n'); // sends the contents of H to the location pointed by the stack pointer.
printf(' MVI L,FFH \n');
l=hex2dec(['FF']);
l=dec2bin(l,8);
printf(' L--> '); // set all bits in L to logic 1.
disp(l);
printf('\n \n PUSH PSW \n \n'); // save flags on top of the stack
printf(' XTHL \n \n'); // set all bits in the top stack location.
printf(' POP PSW \n \n'); // now the zero flag is set.
printf(' JZ NOEROR \n \n');
printf(' JMP ERROR \n \n');
printf('NOEROR: POP H \n \n'); // retrives the data from the stack into H if zero flag is set
printf(' RET');
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