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DX-10 BOOTSTRAP FROM PDP-10
This document reflects the software as of version 2(15).
Copyright (C) 1975,1976,1977
Digital Equipment Corporation, Maynard, Mass.
This software is furnished under a license for use only on a single
computer system and may be copied only with the inclusion of the above
copyright notice. This software, or any other copies thereof, may not
be provided or otherwise made available to any other person except for
use on such system and to one who agrees to these license terms.
Title to and ownership of the software shall at all times remain in
The information in this software is subject to change without notice
and should not be construed as a commitment by Digital Equipment
DEC assumes no responsibility for the use or reliability of its
software on equipment which is not supplied by DEC.
BOOTDX Page 2
BOOTDX is a bootstrap program designed to load or dump programs from
the PDP-10 into the PDP-8A in the DX-10. The two main functions of
1. Loading a program into PDP-8 memory from a PDP-10 disk file
or the PDP-10 paper tape reader.
Warning: BOOTDX reads ONLY image mode PDP-8 files.
2. Dumping PDP-8 memory into a PDP-10 disk file, creating an
ASCII listing of the contents of the PDP-8 suitable for
listing on a line printer.
BOOTDX runs in USER mode under a DECsystem-10 timesharing system. It
requires a minimum of 2K of memory but expands for IO buffers. BOOTDX
does IO instructions direct to the DX10 hardware. For this to work,
the BOOTDX job must have privileges for the TRPSET function of the
2.0 OPERATION AND COMMAND STRING FORMAT
The program BOOTDX should normally reside in the system SYS: area.
"R BOOTDX" starts the program which responds by typing
and waiting for some typed input, terminated by a carriage return.
The expected input is a standard DECsystem-10 file descriptor,
followed by switches telling BOOTDX what to do:
2.1 Loading the DX-10
/LOAD:S Load the DX-10 from the specified PDP-10 file and
set the starting address to the octal value S.
/START:S Load the DX-10 from the specified PDP-10 file and
start the -8 at octal location S. If :S is not
present, the default :S is 200 octal.
/CLEAR:C Set PDP-8 memory from 0 to C-1 to all HALT
instructions. /CLEAR should be used with /LOAD or
/START to preset -8 memory before loading.
/UNIT:U Do the specified operation for unit number U.
(DX-10 0 is device code 220, 1 is 224.)
/CLEAR AND /UNIT may be used with /LOAD or /START. /LOAD and /START
may not be used together.
BOOTDX Page 3
2.2 Dumping the PDP-8
/DUMP:M Dump PDP-8 memory starting at octal location M
into the specified PDP-10 file.
/END:N N-1 is the last address of the dump.
/UNIT:U Do the specified operation for DX-10 number U.
(DX-10 0 is device code 220, 1 is 224.)
These three switches may be used together. /DUMP is required for
2.3 Getting Help
/HELP Read and type the help text from file
HLP:BOOTDX.HLP or SYS:BOOTDX.HLP
Standard default values are assumed for any parts of the file
descriptor or switch values not explicitly specified:
Item Default value
EXTENSION .BIN for loading ,or
.LSD for dumping
(A blank extension may be specifed by
explicitly typing a dot with no extension
[PROJ,PROG] [self], allows SFD's
:C 10000 octal
:N 10000 octal
:S 200 octal
If no switches are specified, BOOTDX defaults to /START. If the
entire input command is omitted and only a carriage return is typed,
the default action is:
The simplest dump command is /D. The defaults expand to:
The switches may all be abbreviated to their first letter or
BOOTDX Page 4
3.0 PDP-8 FORMATTED IMAGE MODE FILES
4.0 GENERAL INTERNAL OPERATION
5.0 BOOTDX PROGRESS MESSAGES AND WARNINGS
" DX-10 loading
The PDP-8 is being loaded with the image mode
input file data
" DX-10 loaded
" DX-10 started
The loading is complete and the PDP-8 is now
executing code in its own memory.
" DX-10 dumping
The PDP-8 memory is being dumped into a
" DX-10 dumped
" Clearing DX-10
The -11 memory is being set to HALT
5.1 Command String Error Messages
? Can't /CLEAR and /DUMP at the same time
? Can't /LOAD and /DUMP at the same time
? Can't do both /LOAD and /START
? Illegal DX10 channel number
? Ambiguous switch--type /H for help
? Unknown switch--type /H for help
? Command error--type /H for help
5.2 Image Mode File Input Error Messages
? Can't OPEN the input device
The input device does not exist or is in use.
(Also refer to the DECsystem-10 MONITOR CALLS
BOOTDX Page 5
? LOOKUP failed
The input file is not found, is read
protected, or the input device doesn't do
input. (Also refer to the DECsystem-10
MONITOR CALLS Manual.)
? Input file read error
? Checksum does not match
The data check in the image file is wrong for
some unknown reason.
5.3 Dump File Output Error Messages
? Can't OPEN the output device
The output device does not exist or is in
use. (Also refer to the DECsystem-10 MONITOR
? ENTER failed
The output file is being modified or the file
or the UFD is write protected. Also see the
DECsystem-10 MONITOR CALLS manual.
? Output device error
Insufficient room exists on the output device
for the dump file. (Refer to the
DECsystem-10 MONITOR CALLS Manual.)
5.4 Miscellaneous Failure Messages
? TRPSET failed
The job does not have the privileges for
TRPSET, or TRPSET is not built into this
version of the Monitor. (See your friendly
[End of BOOTDX.RNO]