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Operating Instructions
Long dumps may be terminated with a CONTROL-P.
@
F <start> <end> <number> - Fill the block from <start"
address
to <end> address with <number>.
3.6.1.6 Accessing Physical (Unmapped) Memory
Master Clearing the system sets the CPU to 16S (sectored, real memory)
addressing.
If
the
system has not been cleared, access to physical
memory is possible by setting the VCP's Memory Access mode.
CP> MO ABS
CP> A 1000 :0
1000:
001004 /
CP>
3.6.1.7 Accessing Virtual (Mapped) Memory
The "MO
MAP"
command
allows
the
CPU
to
access
virtual
memory
(default).
Virtual
addresses
(28 bit) are mapped through the CPU's
Segment Table Lookaside Buffer (STLB) or tables located within
memory
itself.
The tables will give the CPU the real (22 bit) address, which
it will access and display.
1.
Verify that the CPU
is
in
segmentation
mode.
(See
"Changing
Processor Modes".
CP> A MODALS
XXXXXXXXXXXXXXXX /
2.
Put the VCP in virtual accessing mode and access the address.
CP> MO MAP
CP> A 000004/100011 :0
000004/100011: 00000012 cr
000004/100012: 00110540 7
CP>
If
no
segment
number
is entered, the VCP uses the current segment.
The real memory address is never displayed, only data from it or to it
is displayed.
If the virtual address is for a
page
not
located
in
memory,
the
data
display
is
unpredictable,
since the CPU can not
access the paging disk for the page.
3.6.1.8 Accessing Physical Register Files
Every 50 Series processor, except the 850, has 128
registers
divided
into 4 sets.
Because the 850 has 2 CPUs, it has 256 registers divided
into
8
sets.
The
four register sets are:
RFO (u-code scratch and
system registers), RF] (DMX), RF2
(Current
Register
Set),
and
RF3
(Current
Register
Set).
The
DMX register is 32 DMA channels.
One
Current Register Set (CRS)
contains
the
keys
and
modals
for
the
currently
running
or
most recently run process.
The other register
set (Other Register Set) contains the keys and modals for
some
other
process.
The
high
side, low side, or entire register can be dumped, depending
on the mode of the VCP.
070-C
3 -
22
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