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Prime Proprietary
Operating Instructions
NOTE
An attempt to BOOT in PRIMOS II before the disk drive is ready
may fail (no message will be printed at the system
terminal).
If this happens, wait for the drive to become ready and repeat
the BOOT procedure.
If
the baud rate of the system console is not set the same as
the BOOT program, the
'PHYSICAL
DEV='
prompt
will
not
be
printed.
The baud rate on a Master disk is 300.
3.6.1.5 Accessing Memory and Register Files
3.6.1.5.1 Memory Addresses
Virtual
memory is divided into segments, which are like chapters ina
book.
Each of these segments is subdivided into pages.
Each page
is
then divided into words.
There are 1024 words on a page and a maximum
of 64 pages in a segment.
When
entering
VCP
commands, anywhere an address is required, either
"Segno/Wordno" or simply "Wordno" may be used.
"Segno" is the segment
number;
"Wordno"
is
the
word
number
in
the
segment,
The
VCP
remembers
the
last segment number referenced as the current segment;
it will use this current segment if "Segno" is omitted.
The
initial
value of the current segment is zero (0).
To
display the contents of word 12 in segment 3 and then the contents
of word 14 in the same segment, use this command sequence:
DISPLAY 000003/000012
DISPLAY 000014
The VCP uses mnemonics,
instead
of
addreses,
to
identify
certain
register
locations.
Register
file locations are explained in Table
3-7.
Two of the most important registers are "Keys" and "Modals".
A
bit-by-bit
description
of
these appears in Tables 3-8 and 3-9.
VCP
mnemonics are explained in Table 3-10.
3.6.1.5.2 Data Representation
Data may be represented in any of 5 formats as follows:
:0 :H 3B 3D 3A
Data is displayed in octal, hexadecimal,
binary,
decimal
or
ASCII,
respectively.
If
two
indicators are used (for example, :B :H), the
first refers to data, the second to address display.
":B
:H"
means
display data in binary and addresses in hexadecimal.
These indicators
are
also
valid
after
the DUMP and ACCESS commands.
Note, however,
that the address mode indication will not take effect until
the
next
command.
For example, the command:
D 1000 1010 :A :0
dumps, in ASCII, from the locations '1000 to '1010 in the address mode
at
the
time the DUMP command was given.
The address could be octal,
3
-
15
070-C
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