Very wrong and evil - Jay Maynard

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Thursday, 19 May 2005


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2105 - Very wrong and evil

I decided I couldn't sit on this one...

Here's a picture of the left end of the computer shelving as it now looks...

The overall view

The interesting (and/or wrong and/or evil) part is what's on the screen of the Apple //e:

System console

That's a real master console display from a real copy of MVS 3.8, running on Hercules on the Power Mac G5. (A larger version may be found here.) Needless to say, that's not what one would expect to find on an Apple //e's monitor...

Here's a picture of the TSO user session, on a real 3270 right above it:

Console and TSO session

As before, a larger version is also available.

The Apple is connected to a 3174 terminal controller with an Asynchronous Emulation Adapter. This feature allows an async ASCII terminal to look like a real 3270. The Apple is running Kermit-65 and emulating a VT-100. The 3174 provides a TN3270 network connection over a Token Ring LAN, which is gatewayed to the house network through a Linux box set up as a router (among other things). Interestingly, the Apple drops characters badly at 2400 baud and higher - unless it's running 3270 mode, where it doesn't have to spend lots of time scrolling the screen.

Old mainframers, especially, will run screaming when they see these pictures.

current mood: [mood icon] evil! evil!

(12 comments | Leave a comment)

Comments:


[User Picture]
From:richardf8
Date: - 0000
(Link)
I have not seen an MVS console screen in years. That is just surreal. You are a sick, sick man. But I must laugh, because I remember an old mainframer jiving me about how PC's would never match that power. And now you've gone and run MVS in a virtual machine on a PC.

Oh, and BTW, nice letter in the STrib regarding Nick Coleman's take on Vick's BAC
[User Picture]
From:jmaynard
Date: - 0000
(Link)
You are a sick, sick man.
Thank you! When I saw the 3174 beneath the Apple, I got inspired...

I've been involved with Hercules since 1999, and the project manager since mid-2000. A lot of good people have put a lot of hard work into Hercules, and it shows. Every now and then, I have to stop and boggle just a little at the fact that I can carry around more computing power - even emulated in portable, not all that optimized C - in my briefcase than the first three mainframes I worked on for a living. Things really do improve more than we can possibly guess.

That doesn't mean that my PowerBook G4/867 can handle the real-world workload that those mainframes could, though. There's far more to a mainframe than CPU horsepower, and it's those other things that folks tend to ignore or forget about - and it's those things that make the mainframe such a workhorse, even today.
[User Picture]
From:jmaynard
Date: - 0000
(Link)
I sent that letter in right after I posted the LJ entry. I was pleased to see the STrib print it; they usually ignore me, since I'm too conservative for them.
[User Picture]
From:cathyr19355
Date: - 0000
(Link)
My first thought was that you were going to pervert a Playstation 2 to your evil purposes, somehow. But what do I know? I'm just a lawyer....
[User Picture]
From:jmaynard
Date: - 0000
(Link)
Naw. A PS2 is far too modern.
[User Picture]
From:cathyr19355
Date: - 0000
(Link)
That's why it would be so evil. A modern game machine, acting as the monitor for an IBM mainframe--either actual or simulated.
[User Picture]
From:zarchasmpgmr
Date: - 0000
(Link)
*wanders over from IBM-MAIN*

Holy mother of all that is just, just, plain wrong.

You now have to dig up a TTY

(Didn't realize you had an LJ. I'm adding you to my FL.)
[User Picture]
From:jmaynard
Date: - 0000
(Link)
Not gonna do a TTY, if for no other reason than I'm not about to haul it upstairs to the computer room.

I have considered hooking that RX-80 printer you see to a protocol converter and using it as a 3287, though...
[User Picture]
From:zarchasmpgmr
Date: - 0000
(Link)
Now that is just even scarier.

Got any 2741's lying around? (Naaah, those things are heavy, too - heavier than Selectrics.)

(Feel free to add me to your friends list if you'd like. It's nice to see a fellow mainframer on LJ.)
[User Picture]
From:vakkotaur
Date: - 0000
(Link)

There's also the matter of not having space for a TTY.

From:dammital
Date: - 0000
(Link)
I thought at first you sere running Hercules on that //e -- ported to Applesoft Basic, of course.

(But you only claim to be evil, and not insane.)
[User Picture]
From:jmaynard
Date: - 0000
(Link)
Heh...no, I doubt Hercules could be stuffed into that machine with a hydraulic ram. (So to speak.) Quite aside from everything else, it's pretty dependent on having Unix APIs available, and in a few places, it depends specifically on Linux system calls. (Mainly in SCSi tape handling.)

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