Big computers, little computers - Jay Maynard

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Monday, 9 January 2006


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1709 - Big computers, little computers

Yesterday, I got my third mainframe running in the machine room. It's another P/390, this time in an RS/6000 7013-591 (yes, kjaer, that's the one) server system. It's got a channel adapter board so I can use the 3174 CRT controller in channel-attached mode, instead of just over the network.

Today, I got in a computer kit I ordered a year ago. The P112 is a small, single-board computer based on a modern Z80 variant and designed to run the CP/M operating system of days gone by. It's small enough to mount to the bottom of a 3.5 inch floppy drive, and will talk to common, garden-variety PC 1.44 MB (and 5-1/4 inch, 1.2 MB) drives just fine. It went together quickly and as easily as could be expected. (It's a densely packed board. If you're contemplating building one, and haven't built a PC board before, this is not the kit for you.) Haven't tried it yet; that's this evening, hopefully.

current mood: [mood icon] geeky
current music: Alan Parsons Project - (The System Of) Doctor Tarr And Professor Fether

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Comments:


[User Picture]
From:kjaer
Date: - 0000
(Link)
That wouldn't be the 7013-591 I sent you, would it?

...oh my god, you know kinkyturtle. I swear there is some weird LJ-two-degrees thing going on here. A couple weeks ago I discovered through the miracle of LJ friends-of that a guy I worked with five years ago was a friend-of-a-friend of somebody else... and two social circles I never expected even orbited each other suddenly went supernova.
[User Picture]
From:jmaynard
Date: - 0000
(Link)
Yes, it is. I've fixed the entry. (I'd forgotten it's a 591.) Haven't decided what to run on it yet, although there will be at least MVS 3.8 (which will run on the P/390 if you manually set one of the control registers right after IPL). VM/370 r6 will run on the P/390, but it takes a software patch to reload CR0 at each dispatch.

I've known KT for about a decade now. I met him through Animaniacs fandom. How do you know him?
[User Picture]
From:kjaer
Date: - 0000
(Link)
I don't really know him, but I have some friends in the furry fandom who do.
[User Picture]
From:sideband
Date: - 0000
(Link)
OOh! I wanna know how it went, and how fast the "modern variant" is, and specs on the whole thing, and if it'll run SETI. ::grin::
[User Picture]
From:jmaynard
Date: - 0000
(Link)
No SETI, but it is pretty nifty for a CP/M system...16 MHz Z80182, with PC/AT-style ports for two serial, parallel, and two floppy interfaces (4 drives). Comes with 64K RAM and a 32K ROM with a lot of stuff built in; can be upgraded to a meg of bankswitched RAM. It's expandable, too, and there's a guy who will probably produce an IDE hard disk interface for it (which the software already knows how to talk to).

After playing with one of the floppy drives I had earmarked for it and discovering it was jammed, it came right up with a replacement drive.

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