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OpenVMS Hobbyist Program | Alpha Systems Forums | Emulated Alpha Forum
Author Working on a new Alpha Emulator...
JonathanBelanger
Member

Posts: 32
Joined: 09.06.16
Posted on June 23 2017 07:42
I thought I'd add this here.

I have recently starting writing my own Alpha AXP emulator (a 21264). The ones out there are great, but many of them were not designed to be multithreaded, and have this kind of hack threading into the implementation. The one I'm writing, will be as accurate an implementation of the 21264 as I can make it. It will be able to execute 4 instructions simultaneously, just like the real CPU. I'm also going to take a page out of the alternative meaning of the acronym RISC (Relegate Important Stuff to Compilers). I have seen quite a bit of other code that has tried to best-guess the compile, but using masks and shifts and whatnot (it also make debugging harder). We'll see how far I get, but I'm having a ball writing it (I always said, that if I were not writing code for my job, I'd do it as a hobby -- so that's what I'm doing).

~Jon.
Author RE: Working on a new Alpha Emulator...
John Manger
Member

User Avatar

Posts: 45
Location: nr Heathrow, Middlesex, UK
Joined: 18.03.10
Posted on September 08 2017 21:50
It sounds very interesting.
Any word on progress ? Got it booting as an Alpha yet ?

John M
Author RE: Working on a new Alpha Emulator...
JonathanBelanger
Member

Posts: 32
Joined: 09.06.16
Posted on September 28 2017 08:59
Not booted yet. There is quite a bit of coding to be implemented, I have parts of the instruction, integer, floating-point, and data cache implemented and tested (the IEEE floating point instructions passed 100% of the IEEE test cases). I have not yet, introduced threads (and each CPU will require 9 of them). The system interface is also not yet implemented. The system interface contains all the devices associated with a computer system (disk, memory, network, console, etc. - each being yet another thread). I am hoping to have it booted from the SROM (pre-console system) in the next few months.

I you want to see what I have done, thus far, you can go to GitHub and search for DECemu.

~Jon.
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malmberg
December 12 2017
HPE only makes the most current version of OpenVMS Alpha / IA64 /VAX available to hobbyists. When I had access to the Alliance 1 program it was the same. No public downloads are allowed by HPE.

nmbonao
December 08 2017
Is anybody knows OpenVMS 8.2 version downloadable version? or CD copy? Thank you very much

aarommes
December 02 2017
Bitcoin and Blockchain enthusiasts ( plus distributed computing ) please connec / reply: http://www.openvmshobbyis
t.com/forum/viewthread.ph
p?forum_id=130&thread_id=
2991


malmberg
September 10 2017
https://sourceforge.net/p
/vms-ports/wiki/VMSInstal
lation/ For the most part just use VMS 6.1 media instead of 7.3. But why run the older release?


DoeveR
August 07 2017
Where can I find the write up on running VMS 6.1 using the simh emulator?

Bart
March 20 2017
Happy to have found my password again!

pintero
March 16 2017
peteherrera. Agreed.

peteherrera
March 04 2017
It would be nice to be able to buy the lastest hardcopy full OpenVMS docset at a very reduced price through the Hobbyist program. smiley

malmberg
February 05 2017
Decus > Connect > Encompass<Country>

ChrisChiesa
February 02 2017
What's the status of DECUS memberships? Just found my membership card. :-)

bofh
January 06 2017
Searching for Pathworks 6.0 for DOS & Windows. Anyone have it?

malmberg
December 29 2016
The openvms disks question is frequently answered in the forums, and is not something to ask about in the shout box.

Cmota
December 29 2016
Hello, I am in need of the openvms.disk, but I don't know where to obtain it

moch75
December 26 2016
personal alpha

moch75
December 24 2016
personal alpha+

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