Hi Rupert;

        Have you seen "VisibleZ" which can be downloaded via 
https://punctiliousprogrammer.com/ ?

Regards; Phil 

-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of 
Rupert Reynolds
Sent: Saturday, 13 July 2019 5:18 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Amateur project: microcode emulation

Any advice, please? (apart from MVS 3.8J with Hercules. I already have that. 
But I lost the automation interface I wrote years ago)

It's been many years since I was an IBM geek. MVS/ESA and JES3, with Z/OS on 
the horizon.

Is there any microcode available (functionally equiv, if not the genuine
article) that might allow me to start with basic 31-bit ESA instructions and 
perhaps add others as I go?

I started an emulator that ran code for unit testing (at kips, not mips :-)
) but the good thing was that when it crashed I could slam it into reverse gear 
and see how I got there.

I always wanted to update it and port it to run on an Android tablet and it 
seems I have some time now :-)

Thanks in advance for any pointers or suggestions.

Rupert

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