I wonder if it&#x27;s worth it for someone else to try to make a mainframe clone.  I remember some company selling the Hercules emulator on an HP IA64 machine- PSI I think.<p>It would be fun to try to make an FPGA version.<p>Oh yeah, PSI: <a href="http:&#x2F;&#x2F;www.theregister.co.uk&#x2F;2008&#x2F;07&#x2F;02&#x2F;ibm_buys_psi&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.theregister.co.uk&#x2F;2008&#x2F;07&#x2F;02&#x2F;ibm_buys_psi&#x2F;</a>