****************************************************
 _____ ___________ ____     _   _ _   _ _______   __
|  _  /  ___|  ___/ /  |   | | | | \ | |_   _\ \ / /
| | | \ `--.| |_ / /`| |   | | | |  \| | | |  \ V / 
| | | |`--. \  _/ /  | |   | | | | . ` | | |  /   \ 
\ \_/ /\__/ / |/ /  _| |_  | |_| | |\  |_| |_/ /^\ \
 \___/\____/\_/_/   \___/   \___/\_| \_/\___/\/   \/

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Running OSF/1 under gxemul 
---------------------------

gxemul is a machine simulator http://gavare.se/gxemul/ that can simulate 
a number of machines. We will be concerned here with the early alpha version 
of OSF/1.
DEC's first release of OSF/1 (OSF/1 Release 1.0) in January 1992 was for its
line of MIPS-based DECstation workstations,[2] however this was never a fully supported product. 

I have tested and compiled gxemul via pkgsrc framework 
https://www.pkgsrc.org/  
Pkgsrc is highly portable and can be bootstrapped on multiple UNIX like systems 

I have compiled it on MacOS Big Sur M1  
Just make sure you have the ARM64 XQuartz installed  and Xcode 

MIPS OSF/1 disk images are here, please uncompress them 

disk1.img.xz
disk2.img.xz
 
Just unxz these archives and place the loader script in the path 

gxemul -M 128 -e 3max -d disk1.img  -d disk2.img 
     
Root password is: p4ssw0rd  
User password is: p4ssw0rd 

There is GCC-2.7.2.3 in your path to compile some code 
And a bunch of tools for you to play around in /usr/local 

Some good reference https://kb.pocnet.net/wiki/OSF/1_1.0   (if you want to be hardcore)