port.h

#ifndef __PORT_H
#define __PORT_H

#include "types.h"

    class Port
    {
    protected:
        uint16_t portnumber;
        Port(uint16_t portnumber);
        ~Port();
    };

    class Port8Bit : public Port
    {
    public:
        Port8Bit(uint16_t portnumber);
        ~Port8Bit();
        virtual void Write(uint8_t data);
        virtual uint8_t Read();
    };

    class Port8BitSlow : public Port8Bit
    {
    public:
        Port8BitSlow(uint16_t portnumber);
        ~Port8BitSlow();
        virtual void Write(uint8_t data);
    };

    class Port16Bit : public Port
    {
    public:
        Port16Bit(uint16_t portnumber);
        ~Port16Bit();
        void Write(uint16_t data);
        uint16_t Read();
    };

    class Port32Bit : public Port
    {
    public:
        Port32Bit(uint16_t portnumber);
        ~Port32Bit();
        void Write(uint32_t data);
        uint32_t Read();
    };    
#endif