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1450 XLD motherboard build, assorted questions


Vandal968

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No. I would imagine that if the Freddie chip were different, it would have had a different code name. We just can't copy one very well.

Ah, I guess I don't understand why we'd even want to try when every cheap-o XE out there has one. I'm sure I have a couple laying around from late model XL's too. I don't think I'd try to convert my 1450 to SRAM because I think it would be cooler to keep it as stock as possible. I'm not really planning on using it much.

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Where?

 

Bob

 

 

Take a look at the equation PDF I posted in the ore 1450 thread to see if the logic matches up.

http://www.atariage.com/forums/topic/141979-1450-parts-lists/page__view__findpost__p__1721433

 

And then the power supply is in this thread: http://www.atariage.com/forums/topic/106884-1400xl-internals/page__view__findpost__p__1294965

Edited by kheller2
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...I'll probably finish it as a 1400XL instead.

Aesthetically preferable, IMO. In either case, this will be really awesome if you get it working.

 

 

Absolutely.

 

The 1450XL(D?) looks like Frankenstein having received thorough (yet thoughtful) make-up before filming.

 

On the other hand, the 1400 fully bridges 400/800 ("JayMiner")-class and XL-class machines, while also striking a nice balance of function, form, and independence of storage (you can nicely lay one or two NUXX drives on top of its casing, making it a KILLER-looking and working 8bit combo).

 

Conversely, I would also finish it to 1450XL-model standards, but in 1200/1400-case, and internal solid-sate storage (instead of clumsy and noisy 1050 drives or any external add-on). I would call it the 1400XLR and it could very well be the ultimate 8bit-series to have.

 

F.

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Some additional 1450 notes..

http://www.digitpress.com/library/techdocs/#atari8bit

Anything dated after 1/84 probably doesn't apply to the "1450" board but the TONG board instead. There is a newer Tong parts list there.

 

I also just found a parts list comparing the "600 (X4A), 800(X1A), 1400(X1), 1450(2A)" dated 5/5/83. Its wrong of course, but for historical purposes, I'll scan it in.

 

Now, I think it would be interesting to do a run of AMY chips... there should be enough documentation out there and the development software to program for it. Just need a chip to fab.

Edited by kheller2
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I pulled the 1400/1450 Tube with all of the schematics, PC board layouts and case mechanicals, I also have a BOM printout for the boards too (TONG as well) what I unfortunately don't have is the schem's for the TONG version boards, wish I did :-(

 

I've got a few things I need to take care of for my friend Karl from the old Atari Explorer site and once I wrap that up, I'll scan in the sheets, it will make placement of parts a lot easier and the BOM I have in a folder of 1400 and 1450 files, so that's no problem.

 

 

Curt

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It's in the pics there... weird, the +12V is only 30 mA. I'd have thought with the 1450, the +12V would have been sufficient to supply 2 drive mechs.

 

 

You were looking at the 1400 brick, not the 1450. Mind you, that 1400 supply is what came with the prototype I had. I have no idea if it's official. I read in one of Atari's test documents that there was a large failure rate during testing and had to be redesigned for heat issues.

 

I'm not sure if that 1450 supply is the same brick for a TONG.

 

Hmmm. Anyone ever see a master CO part number list and a master document list. That would be useful for a lot of things, least of which would be speculation. :)

Edited by kheller2
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strike that, they are all sold

 

Yah, I heard he jacked up the price because people started ordering a bunch of them because of this thread. It's a shame, because it's probably a bunch of people who got it that thought "Oooh, proto collectible", will sit and stare at it for a bit and then throw it up on e-bay when they decide it's just something to stare at. Taking it out of the hands (and normal price range) of people that could have actually done something with it.

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The 1450 supply that's shown has a 2amp capacity on the +12v. The 1400 does not have drives, only the modem, I imagine.

 

I have a supply (CO62023) that has a similar pinout - +5v on 1&6, +12v on 4, -5v on 2, and 3,5,7 as ground. Like these, except a 7-pin connector. I'd like to see the computer-side pinouts, if anyone knows where they are.

 

Bob

 

 

 

 

 

It's in the pics there... weird, the +12V is only 30 mA. I'd have thought with the 1450, the +12V would have been sufficient to supply 2 drive mechs.

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Here is an interesting historical Bill Of Materials listing. This is from 5/9/83, months before the 1450 board that is in the thread was produced. It shows the 600(X4A) using Antic E instead of Antic, and the Freddie chip only in the PAL 800.. probably a typo, as the 1400 is listed as using a 7 pin female power jack. In any case, here is a nice list of CO part numbers here for cross references.

 

Atari Old BOM sm.pdf

Edited by kheller2
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