#include <stdio.h>
/*
    DDRx  - The Port x Data Direction Register - read/write
    PORTx - The Port x Data Register - read/write
    PINx  - The Port x Input Pins Register - read only 
*/

#define SERIALBUFSIZE         11
//char serialBuffer[SERIALBUFSIZE];
//byte setBufPointer = 0;

#define  CS     10
#define  OE     11
#define  DEVVCC 12
#define  REC_TYPE 0

unsigned long addrSize = 65536;


void setup() {                
  Serial.begin(115200);  
  delay(1000);
  PORTD = 0xFF;
  PORTC = 0xFF;
  PORTB = 0xFF; // needed for switch from tristate to output low
  PORTA = 0xFF;
  DDRD = DDRD | 0b11111100; // switch all but serial pins to output
  DDRC = 0x00;  // input
  DDRB = 0xFF;  // output
  DDRA = 0xFF;  // output
  Serial.println("PAL16C1 read v1.0");
  Serial.println("B7,  B6,B5,B4,B3,B2, B1, B0, A7, A6, A5, A4,A3,A2,A1,A0, C0");
  Serial.println("IORQ,M1,D2,D1,D0,A15,A14,A13,A12,A11,A10,A9,A8,A7,A6,A5, out");
  delay(100);
}

void loop() {

  int addrPoint;
  byte data;
  char fmtStr[20];
  
  for (addrPoint = 0; addrPoint < addrSize; addrPoint++) {
 //   sprintf(fmtStr, "%04X\n", addrPoint);
 //   Serial.print(fmtStr);
    printBinary(addrPoint);
    setAddress(addrPoint);
    data = 0x01 & getData();
    Serial.println(data, DEC);
  }
  while(1) {} // halt
}

void setAddress(int address) {
  byte highAddr;
  byte lowAddr;
  highAddr = address >> 8;
  lowAddr  = address & 0xFF;
  PORTA = highAddr;
  PORTB = lowAddr;  
}

byte getData(void) {
  return PINC; 
}

void printBinary(int address) {
  int bit;
  int bitCounter;
  address = address & 0xFFFF;
  for (bitCounter = 15; bitCounter >= 0; bitCounter--) {
    bit = (address & (1 << bitCounter)) ? 1 : 0;
    Serial.print(bit, DEC);
  }
  Serial.print(" ");
}