The old machine runs - Jay Maynard

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Sunday, 13 March 2005


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2132 - The old machine runs

I got the TRS-80 model II running about as well as a model II ever did. I replaced the disk drive mechanism, swapping the electronics in the process, so the replacement drive went in with the original drive's electronics, thus making one good drive out of one bad and one flaky one. When I did that, the machine came up, but the display's left side was wrapping around. A bit of tweaking on the monitor's horizontal hold control fixed that.

By request, here are some pictures...

Front view, with the power off:
Front view, power off

Front view, running CP/M. The display's a bit hard to read, but it's a directory listing of the contents of the A: disk:
Front view, power on

Side view:
Side view

Back view:
Back view

The innards. The disk drive is on the far left; the card cage is in the middle, with, left to right, video/keyboard, memory, floppy controller, and CPU cards; the monitor is to its right; and the power supply is on the far right.
The innards

current mood: [mood icon] accomplished

(13 comments | Leave a comment)

Comments:


[User Picture]
From:cathyr19355
Date: - 0000
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By request, here are some pictures...behind a cut, to keep your friends page tidy.

My friends are such a motley crew, Jay, that nothing is likely to keep my Friends Page tidy. But that's okay. I prefer it to be varied, and interesting.

The pictures are...impressive, in a kind of retro way. I hope landley is checking them out. Historic computer relics are right up his alley.
[User Picture]
From:paragod
Date: - 0000
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That brings back memories. I used to mess with one at a friend's house. I wound up getting the TRS-80 CoCo instead. I ran a BBS on it for a while and eventually turned it into a repeater controller. The joystick fire button detected COR and the tape drive start/stop relay was used for PTT. Audio was taken from the tape drive audio. It had standard features like a squelch tail, CW ID, courtesy tones, time-out timer, etc. Any of this could be adjusted (or repeater xmit shut off) by dialing into the modem. This was written in RS-BASIC. In addition to my own repeater, Harry WT5D also ran this configuration on his repeater for a while, I think it was the old 442.000 machine, circa 1989 or 1990... the good ole days.

brad/N5IQ (ex N5LJV)

[User Picture]
From:shellbellbunny
Date: - 0000
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Wow... How old is that thing? It looks like a nice piece of vintage!
[User Picture]
From:jmaynard
Date: - 0000
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Late 70s or early 80s. I haven't gone looking for date codes in mine; I should probably do that.
From:taliesin89
Date: - 0000
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OMGGGG ITS THE TRON GUY!


You, Sir, are my hero.

:D
From:smitty2004
Date: - 0000
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Wow, I've been hunting for one of those for months. Did you score it off of Ebay?
[User Picture]
From:jmaynard
Date: - 0000
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Yes, I did. They crop up every now and then. They tend to draw a fair amount of interest, especially if in pristine condition. I think the only reason I got mine as cheaply as I did (~$85, shipped) was that the same seller was also selling a model 12, and that went for over $170 plus shipping.
From:smitty2004
Date: - 0000
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Well, looks like I'll just have to be more frequent in my Ebay searches.
You wouldn't happen to have seen a Kaypro "portable" computer listed anywhere, Ebay or otherwise, recently? Those things are so hard to come by, especially since everyone who owns one keeps it for the CP/M operating system.
[User Picture]
From:jmaynard
Date: - 0000
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No, I haven't...by the time the Kaypro came out, so had the Compaq portable, and that was a lot more machine for not a lot more money - so I concentrated in that area.

There are plenty of CP/M machines floating around, though, so if that's all you're interested in, you've got more choices out there...
From:shanenick
Date: - 0000

wow

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That is a thing of beauty. I think I learned Basic on one of those. Maybe even a little Pascal. Is that possible? What are you going to do with it?
[User Picture]
From:jmaynard
Date: - 0000

Re: wow

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Oops, thought I'd replied to this one already. Sorry.

Yeah, you could easily have learned BASIC and Pascal, and maybe even a little FORTRAN, COBOL, and PL/I on it. All of those languages were available on CP/M, and would work just fine. I know BASIC was available under TRSDOS, and maybe Pascal, but I never used TRSDOS on any of them.
[User Picture]
From:sideband
Date: - 0000
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Damn.. You're making me want to scare up my old Commodore 128D and find the CP/M disks for it...

Ah, those were the days..
[User Picture]
From:jmaynard
Date: - 0000
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Of course you'd want to find the CP/M disks. After all, who'd want to run Commodore 64 mode? :-P

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