INT 2F - Communicating Applications Specification - 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  (V.21 SDLC or HDLC mode)
                        100 = 2400 baud (V.27 ter)
                        101 = 4800 baud (V.27 ter)
                        110 = 7200 baud (V.29)
                        111 = 9600 baud (V.29)
                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
                        Note: valid combinations of bits 0-2 are
                                000  COM2 IRQ3 IObase 2F8h
                                001  COM1 IRQ4 IObase 3F8h
                                010  COM4 IRQ3 IObase 2E8h
                                011  COM3 IRQ4 IObase 3E8h
                                110  COM4 IRQ2 IObase 2E8h
                                111  COM3 IRQ5 IObase 3E8h
 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 (only valid while busy, reset when idle)
 10h    DWORD   size of nonstandard format (NSF) file in bytes
 14h    BYTE    'A' if Connection CoProcessor board present
 15h  9 BYTEs   reserved
 1Eh 21 BYTEs   ASCIZ CCITT identification
 33h 77 BYTEs   reserved

Format of status buffer for Intel SatisFAXtion board:
Offset  Size    Description
 00h    BYTE    connection status flags
                bit 7: busy in T.30 CCITT fax protocol
                bit 6: data on current page/file (only used for block xfers)
                bit 5: retransmission of last page requested
                bit 4: in file transfer mode
                bit 3: data in buffer
                bit 2: data buffer dumped on receive
                bit 1: 200x100 dpi resolution instead of 200x200 dpi
                bit 0: data modem in use, FAX image modem not available
 01h    BYTE    board state
                bit 7: reserved
                bit 6: handset jack active, data and FAX modems not available
                bits 5-3: current bit rate
                    000  300 bps (V.21 HDLC)
                    100 2400 bps (V.27 ter)
                    101 4800 bps (V.27 ter)
                    110 7200 bps (V.29)
                    111 9600 bps (V.29)
                bits 2-0: T.30 CCITT protocol state
                    000 idle
                    001 dialing
                    010 answering
                    011 transmitting
                    100 receiving
                    101 pre-message
                    110 post-message
                    111 disconnect
 02h    BYTE    number of KB free in buffer
 03h    BYTE    number of pages or files in buffer
 04h    BYTE    number of redials remaining on current number
 05h    BYTE    FAX page number to retransmit
 06h    BYTE    current page/file in block transfer
 07h    BYTE    number of rings received (only if auto-answer enabled)
 08h    WORD    error count
 0Ah    DWORD   length of file being transferred
 0Eh  6 BYTEs   reserved
 14h    BYTE    'B' is SatisFAXtion board present
 15h 13 BYTEs   ASCIZ transfer agent name
 22h  5 BYTEs   ASCIZ transfer agent version number
 27h 13 BYTEs   ASCIZ resident loader name
 34h  5 BYTEs   ASCIZ resident loader version number
 39h 21 BYTEs   ASCIZ remote CSID
 4Eh 13 BYTEs   ASCIZ resident manager name
 5Bh  5 BYTEs   ASCIZ resident manager version number
 60h 32 BYTEs   reserved
Note:   the Intel Connection CoProcessor and SatisFAXtion may be distinguished
          by examining the byte at offset 14h