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        FOSSIL (Fido/Opus/Seadog Standard Interface Level) - INITIALIZE

        Entry:
        AH = 00h
        AL = initializing parameters
            7 - 6 - 5      4 - 3     2    1 - 0
            -BAUD RATE-    PARITY   STOP   WORD
                                    BITS  LENGTH
            000 19200 bd   00 none  0: 1  00: 5
            001 38400 bd   01 odd   1: 2  01: 6
            010   300 bd   11 even        10: 7
            011   600 bd                  11: 8
            100  1200 bd
            101  2400 bd
            110  4800 bd
            111  9600 bd (4800 on PCjr)
        DX = port number (0-3 or FFh if only performing non-I/O setup)

        Return:
        AH = RS-232 status code bits
            0: RDA - input data is available in buffer
            1: OVRN - data has been lost
            5: THRE - room is available in output buffer
            6: TSRE - output buffer empty
        AL = modem status bits
            3: always 1
            7: DCD - carrier detect