F5
Key - Edit (Real/Virtual)
Press the F5 key to display VIRTUAL STORAGE. The
virtual storage display overlays the real 370 storage display.
Press F5 again to display the real 370 storage again. By
pressing F5 you can switch between displays of real and
virtual storage in the storage display area of the screen.
If
the data for a virtual address
is
not currently in storage, the
storage contents will
be
displayed as
"X"s
and the fields will
be locked.
F4
Key - Edit
PAT/Edit
Main
Press
F4
to edit the
PAT
(Page Address Table). This
is
the
hardware table that maps virtual addresses to real addresses.
The
PAT
edit screen
data
overlays the 370 storage edit data.
Pressing the
F4
key again causes the storage edit data to be
displayed again.
The
PAT
edit format has a column of virtual addresses
on
the far left of the screen, followed by columns of the
corresponding real addresses,
the
valid bits, the reference
bits,
and
the change bits respectively.
For
further
information on the
PAT, see the "IBM Personal Computer
XT
/370
Technical Manual," and the section
on
Dynamic
Address Translation in the
"370
Principles of Operations."
You should only alter the
PAT
data if you absolutely know
what you're doing. Virtual storage management
is
a function
of
the
370
operating system. Altering this data could cause
unpredictable results.
Address Compare Stop Function
The
address compare feature automatically stops the
370
processor when it detects
an
instruction execution
at
an
address you've entered. To use this function, enter the
address in the Address Compare Field located in the status
area
on
the screen. You need not supply leading zeros of the
address,
but
may type any non-valid hexadecimal character
after the last entered digit.
If
you enter an invalid address,
such as too large, the
370
Processor Control utility makes
Appendix B. The
370
Processor Control Session
B-7
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