Shamusworld >> Repos - apple2/blob - src/v6522via.h

   1 //
   2 // Virtual 6522 Versatile Interface Adapter
   3 //
   4 // by James Hammons
   5 // (C) 2018 Underground Software
   6 //
   7
   8 #ifndef __V6522VIA_H__
   9 #define __V6522VIA_H__
  10
  11 #include <stdint.h>
  12
  13 struct V6522VIA
  14 {
  15         uint8_t orb, ora;               // Output Register B, A
  16         uint8_t ddrb, ddra;             // Data Direction Register B, A
  17         uint16_t timer1counter; // Timer 1 Counter
  18         uint16_t timer1latch;   // Timer 1 Latch
  19         uint16_t timer2counter; // Timer 2 Counter
  20         uint8_t acr;                    // Auxillary Control Register
  21         uint8_t ifr;                    // Interrupt Flags Register
  22         uint8_t ier;                    // Interrupt Enable Register
  23         uint8_t id;                             // Chip ID # (optional)
  24
  25         V6522VIA();
  26         void Reset(void);
  27         uint8_t Read(uint8_t);
  28         void Write(uint8_t, uint8_t);
  29         bool Run(uint16_t);
  30 };
  31
  32 #endif  // __V6522VIA_H__
  33