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 VICP Headers:

    Byte    Description
    ------------------------------------------------
     0      Operation
     1      Version     1 = version 1
     2      Sequence Number  1..255 , (was unused until June 2003)
     3      Unused
     4      Block size, LSB  (not including this header)
     5      Block size
     6      Block size
     7      Block size, MSB

    Operation bits:
    Bit     Mnemonic    Purpose
    -----------------------------------------------
    D7      DATA        Data block (D0 indicates with/without EOI)
    D6      REMOTE      Remote Mode
    D5      LOCKOUT     Local Lockout (Lockout front panel)
    D4      CLEAR       Device Clear (if sent with data, clear occurs before block is passed to parser)
    D3      SRQ         SRQ (Device -> PC only)
    D2      SERIALPOLL  Request a serial poll
    D1      Reserved    Reserved for future expansion
    D0      EOI         Block terminated in EOI