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INT 2F - Multiplex - Communicating Applications Spec - GET HARDWARE STATUS
        AX = CB12h
        DS:DX -> 128-byte status buffer
Return: AX = 0000h successful
                buffer filled with hardware-dependent status information
           < 0     error code (see AX=CB01h)
SeeAlso: AX=CB11h

Format of status buffer for Intel Connection CoProcessor:
Offset  Size    Description
 00h    BYTE    bit flags
                bit 7: hardware busy sending or receiving
                bit 6: last page of data
                bit 5: no data on current page
                bit 4: retransmit request for current page being transmitted
                bit 3: NSF mode active
                bits 2-0: reserved
 01h    BYTE    number of kilobytes of free buffer space
 02h    BYTE    page buffer status
                bit 7: Connection CoProcessor has documents to send
                bits 6-0: number of pages in buffer
 03h    BYTE    number of retries left for dialing number
 04h    BYTE    page number to retransmit
 05h    BYTE    communications status
                bit 7: originating call
                bit 6: FAX message to be sent
                bit 5: on line
                bit 4: ring detected and receive enabled
                bit 3: buffer dumped on receive
                bits 2-0: hardware sequence state
                        000 idle
                        001 dial
                        010 answer
                        011 transmit
                        100 receive
                        101 pre-message
                        110 post-message
                        111 disconnect
 06h    BYTE    baud rate
                bit 7: reserved
                bits 6-4: baud rate
                        000 = 300 baud (SDLC mode)
                        100 = 2400 baud
                        101 = 4800 baud
                        110 = 7200 baud
                        111 = 9600 baud
                bits 3-0: reserved, should be 0110
 07h  3 BYTEs   reserved
 0Ah    BYTE    hardware status
                bit 7: modem option installed
                bit 6: Connection CoProcessor has control of DAA (not latched)
                bit 5: on line (not latched)
                bit 4: ring detected (not latched)
                bit 3: data in command buffer (not latched)
                bit 2: set if using DMA channel 1, clear if using DMA channel 3
                bit 1: line length compensation bit 1 set (not latched)
                bit 0: line length compensation bit 0 set (not latched)
 0Bh    BYTE    switch states
                bit 7: reserved
                bit 6: unused
                bit 5: spare switch open
                bit 4: FAX ADR1 switch open
                bit 3: FAX ADR0 switch open
                bit 2: alternate interrupt switch open
                bit 1: COM SEL 1 switch open
                bit 0: COM SEL 0 switch open
 0Ch    BYTE    bit flags
                bit 7: reserved
                bit 6: auxiliary relay forced ON
                bit 5: modem select relay forced ON
                bit 4: offhook relay forced ON
                bit 3: 9600 bps enabled
                bit 2: 7200 bps enabled
                bit 1: 4800 bps enabled
                bit 0: 2400 bps enabled
 0Dh    BYTE    reserved
 0Eh    WORD    error count
 10h    DWORD   size of nonstandard format (NSF) file in bytes
 14h 10 BYTEs   reserved
 1Eh 21 BYTEs   ASCIZ CCITT identification
 33h 77 BYTEs   reserved