The chunk directory consists of a series of 8 byte entries, terminated by four zero bytes.
Format of a chunk directory entry:
Size Meaning
1 Operating system identity byte
3 size of chunk (bytes)
4 start (offset from base of card's identity space)
If a chunk directory is present, then it must be preceded by 16 bytes of interrupt status pointers, even if these are not used. The chunk directory is the start of the area of expansion card space where the bit width is set from the extended ECId.
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