sfr P4 = 0xe8;
sbit P47 = P4^7;
sbit P46 = P4^6;
sbit P45 = P4^5;
sbit P44 = P4^4;
sbit P43 = P4^3;
sbit P42 = P4^2;
sbit P41 = P4^1;
sbit P40 = P4^0;
sbit INT2 = P4^3;
sbit INT3 = P4^2;
sbit RESET = P4^7;
sbit ExtA = P4^6;
sbit ALE = P4^5;
sbit PSEN = P4^4;
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