sys_ppi_8255A.h

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#ifndef __SYS_PPI_8255A_H__
#define __SYS_PPI_8255A_H__

#include "ibmpc.h"

namespace IBMPC
{
    class VDD_SYS_PPI_8255A : public Device
    {
        enum
        {
            PORT_A          = 0x60, // read only (cpu reads to know latest keyboard scancode)
            PORT_B          = 0x61, // write (and read?): speaker, enable/disable kbd, other stuff.
            PORT_C          = 0x62, // b0-3: equipment bits; b4: 0; b5:timer 2 chnl out; b6:io chnl check; b7:ram parity check error occurred.
        };

        public:

        VDD_SYS_PPI_8255A();
        ~VDD_SYS_PPI_8255A();

        // implement driver interface
        virtual void init();
        virtual void done();
        virtual uint8 mem_read8(unsigned int addr);
        virtual void mem_write8(unsigned int addr, uint8 value);
        virtual void irq_ack();
        virtual void port_write8(unsigned int port_index, uint8 value);
        virtual uint8 port_read8(unsigned int port_index);
    };
};

#endif

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