Bank information data structure.

typedef struct _BANKINFO {
  ULONG      ulBankLength;     /*  Length of the bank. */
  USHORT     usBank;           /*  Current bank. */
  USHORT     usVideoModeType;  /*  Current video mode type. */
  USHORT     usReadWriteMode;  /*  Read/Write bank mode. */
} BANKINFO;