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#pragma once

#include "clsDevice.h"

class clsKeyboard : public clsDevice

{

        unsigned __int8 buffer[32];

        int head;

        int tail;

public:

        volatile unsigned __int8 scancode;

        volatile unsigned __int8 status;

        clsKeyboard(void);

        ~clsKeyboard(void);

        bool IsSelected(unsigned int ad) { return ((ad & 0xFFFFFFF0)==0xFFDC0000); };

        void Put(unsigned __int8 sc) {

                scancode = sc;

                buffer[head] = sc;

                head++;

                head &= 31;

        };

        unsigned __int8 Get() {

                unsigned __int8 sc;

                sc = 0;

                if (head != tail) {

                        sc = buffer[tail];

                        tail++;

                        tail &= 31;

                }

                return sc;

        };

        unsigned __int8 Peek(int amt) {

                unsigned __int8 sc;

                int ndx;

                ndx = tail + amt;

                ndx &= 31;

                sc = buffer[ndx];

                return sc;

        };

        unsigned __int8 GetStatus() {

                if (head != tail)

                        return 0x80;

                else

                        return 0x00;

        };

};