/*
* Inputs: define inputs
*/

Pin 1 = A8;
Pin 2 = A9;
Pin 3 = A15;
Pin 4 = PSEN;
Pin 5 = WR;
Pin 6 = RD;
Pin [7..9] = [D3..1];

/*
* Outputs: define outputs
*/

Pin 19 = OE;
Pin 18 = RAM_CS;
Pin 17 = WR_REG1;
Pin 16 = WR_REG2;
Pin 15 = WR_REG3;
Pin [14..12] = [Q3..Q1];


OE_S = ((PSEN # RD) & !(PSEN & RD));

!OE = OE_S; /*!PSEN # !RD;*/
!RAM_CS = A15 & (!OE_S # !WR);
!WR_REG1 = !A15 & A8 & !A9 & !WR;
!WR_REG2 = !A15 & !A8 & A9 & !WR;
!WR_REG3 = !A15 & A8 & A9 & !WR;

!LD_S = !A15 & !A8 & !A9 & !RD;
Q1 = LD_S # D1;
Q2 = LD_S # D2;
Q3 = LD_S # D3;