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Yes, Virginia, you really can run a mainframe OS on your PC.

IBM 370 image

The powerful Hercules emulator is what allows us to run a mainframe operating system on a PC. It is open source and runs on Windows, Mac OSX, and Linux machines. It will even run on a Rasberry PI. The offical website is located here. While there are other OS's that can be run with Hercules, the most popular 3 are DOS/VS, MVS, and VM/370.

 

DOS/VS with Power Rel 34

MVS Rel 3.8J

VM/370 Rel 6

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Public Use Online Terminals
IBM 3279
Telnet
SSH

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Other Operating Systems
 

A useful table of
EBCDIC, ASCII, Hex, Decimal, & Octal
conversions

 

General IBM Glossary

 

iTerm3270 - An HTML only Online 3270 Emulator

 

The IBM Compilerator - Online ALGOL,
COBOL, FORTRAN, PL/I, RPG, and SIMULA

 

Using Vintage Mainframe Hardware With Your PC

 

Videos on vintage IBM and CDC mainframes

 

IBM Photo Gallery

 

The collected computer notes of Calamity Coder

 

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IBM 370 image based on work By Oliver.obi (Own work) [CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons
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