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Network Support Encyclopedia 15
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dosgen.txt
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1988-09-04
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Using Multiple Operating Systems with Remote system reset
Beginning with Advanced NetWare version 1.0, it is possible to load different
versions of DOS on workstations using Remote System Reset EPROMS. Prior to
this it was required that all stations using boot EPROMs load the same DOS.
The following procedure explains how to set up a network using IBM PC
CLuster boards. Let's suppose that I have five PC-Jrs.a and 10 PCs. I want the
PC to boot under PC-DOS 3.1 and the Jrs. to boot under PC-DOS 2.1. All cluster
boards on the network are set to unique physical node addresses. As I am
installing the five cluster boards in the five PC-JRs, I take note of their physical
node address settings. Let's say that they are set to 10 through 14 hex.
During the DOSGEN procedure, I make the special diskette that is single-
sided, eight sectors per track and bootable under PC-DOS 2.1. I then continue on
with the DOSGEN procedure sot hat a "picture" of the diskette is taken and
written in the sys:login area as "IBM$DOS.SYS". I next go into the login area and
rename this file to a name of my choice so long as the extension is ".SYS". I
choose the name "PCJRDOS.SYS:. Next I will make a special diskette for PC-DOS
3.1 and run the DOSGEN program. An image file of this diskette is also created
in the login directory as "IMB$DOS.SYS". The last step is make a file with a text
editor as follows. It will be called "BOOTCONF.SYS". The "BOOTCONF.SYS" in
this case would look like this.
0x10=PCJRDOS.SYS
0x11=PCJRDOS.SYS
0x12=PCJRDOS.SYS
0x13=PCJRDOS.SYS
0x14=PCJRDOS.SYS
Note that the physical node addresses of the five PCJRs are listed with the
alternate boot file. When the remote system reset EPROM becomes active, it will
send a packet to the file server. The file server will check the node address of
the machine sending the request and check it against those in the
"BOOTCONF.SYS" file. If there is a match, the server will download the file
mentioned after the node address. If there is no match or if the
"BOOTCONF.SYS" file is not present, then IBM$DOS.SYS will be sent.
If you have an Advanced NetWare /68 system, the above procedure will not
work small older style NIC boards that use the 2K boot EPROM. Your physical
node address is determined by the port that you are connect to. The server that
you are connected to MUST have the boot file configured on it. It is not possible
to boot across servers on /68 systems.
With /86 and /286 systems, any server on the physical network may respond
to a station requesting a DOS image file. The responding server MUST have the
boot files set up on it. If you will have more than one /86 or /286 server on the
same physical network, it is best to have the boot files on all of them. Remote
system reset will NOT work through bridges.