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IBM 4300 Manual page 30

Processors principles of operation for ecps: vse mode
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16-23
the next CCW in an IPL CCW chain
after completion of the IPL initial-read
operation.
IPL CCW2: Bytes 16-23 read during
the
TPL
initial read operation are stored
at locations 16-23. The contents of
these locations may be used as another
CCW in the IPL CCW chain to follow
IPL CCWl.
Chapter 3. Storage
3-11

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