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reallybrett

New Power Supply for 800XL, Is this any good?

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Just got my first Atari computer and could not be more excited. I want to get a new power supply as I have one of the ignot style ones that seem to be frowned upon. I found the below auction on eBay and wanted to see if anyone had any input or experience with this type of replacement power supply.

 

https://www.ebay.com/itm/AC-Adapter-for-9VAC-AC-Atari-CO17945-400-800-810-850-1010-1050-1200XL/352198322911?hash=item5200a7eadf:g:XcIAAOSwcgNZCn3c:sc:USPSFirstClass!18103!US!-1:rk:23:pf:0

 

Thanks!

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That's not suitable - as the listing says it's for 400/800/1200XL and some peripherals - it outputs 9V AC.

 

XL except 1200 and all XE use a 5V DC power supply with 2 pins of a DIN7 plug connected (note C64 uses a similar arrangement but the pin assignments are different and it'll fry the Atari so never use one).

 

AFAIK there's no ready made plug/play replacement but USB wall-warts are everywhere and one that can output about 1.2 Amps or better and maintain voltage can work. All that remains is to graft a DIN7 plug onto a USB lead.

Been meaning to do one myself for a long time, might get around to it soon.

 

As it happens, a ready made cable here https://www.ebay.com/itm/Atari-XL-XE-Replacement-Power-Cable-for-USB-power-supply/283340799495?hash=item41f86d7e07:g:oxIAAOSwsGpb8MTf:sc:USPSFirstClass!90210!US!-1:rk:1:pf:0

 

But the BOM on such a thing - ready to solder DIN plugs can be had generally under 2 bucks. The USB cable, well they practically fall out of trees.

Edited by Rybags

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I found the below auction on eBay and wanted to see if anyone had any input or experience with this type of replacement power supply.

 

https://www.ebay.com/itm/AC-Adapter-for-9VAC-AC-Atari-CO17945-400-800-810-850-1010-1050-1200XL/352198322911?hash=item5200a7eadf:g:XcIAAOSwcgNZCn3c:sc:USPSFirstClass!18103!US!-1:rk:23:pf:0

 

 

This could break your machine as it delivers 9V AC while your 800XL needs 5V DC.

 

If you have the ability to solder you could create a cable like this one I did:

post-7778-0-58697800-1547730466_thumb.jpg

 

and attach this to any USB power source delivering at least 1.5 A.

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You didn't mention which model Atari computer you have. The linked power adapter may work for 400, 800, 1200XL as those use 9VAC, but not on 600XL, 800XL, or XE models. (Those use 5VDC)

 

If you indeed have a 400, 800, or 1200XL, the linked 9VAC psu I'd be a little leery about, as the seller has hidden the amperage rating. it's most likely 1A, whereas the smallest power supplies Atari provided were about 1.6A.

 

For the 5VDC models, it's easier to construct a good replacement using common 5V power supplies or USB charging adapters, usually best if rated for 2A or higher.

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Thanks for all the quick replies, I really appreciate it. I have been collecting for the 2600 for a while now but just dove in to the world of Atari computers. I am going to go with one of the USB to DIN cables and find an adapter that delivers the 1.5 amps.

 

Again thanks for all the help.

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An original PSP charger will work.

 

I had a PSP-100 lying around doing nothing, so I decided to use it the other day. It delivers 5v DC at 2A. I just recently started using it with my XLs and XEs. The input voltage is 100-240v so it will work anywhere!

 

Saw a couple of original ones on eBay for around 10 bucks.

 

post-45355-0-52115600-1547761446_thumb.jpg

 

Watch out for the fakes out there though.

 

All you have to do is cut the plug end of your old PSU ( leaving enough cable with the plug ) and solder the two of the wires to the end of your new AC adapter, taking note of polarity as well.

 

Looking directly at the plug.

 

post-21816-0-93957000-1362538794.jpg

 

Looking from the back of the plug ( or looking directly at the connector on the Atari ).

post-6732-0-51872700-1310533163.gif

Edited by shoestring
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I ended up buying one of the USB to Din cables off of eBay. Seemed to be the most economical way to go about it. I have a 2.1 amp wall wart from an old iPhone that can be used with it so I should be good to go.

 

Thanks for all the input.

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as mentioned over and over, not all phone adapters provide constant voltages... you never know what you are going to get...

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How can I tell then what adapter will provide a constant voltage?

You can check what the Atari is getting under load using a digital multimeter on the +5V and GND pins of one of the joystick ports.

 

I've found it's pretty unpredictable which are good sources of +5VDC. Most phones tolerate +/- 1V so there's a lot of variance. But at least with USB you can try multiple easily :) Also, long USB cable lengths with small guage wire causes further drops. The original supplies have big fat wires to the computer that have almost no loss for the short distance.

 

Below about 4.5V I've found the color starts to change, and some carts like Side2 stop working. Other upgrades present may have other issues...

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Ttl logic devices start to play up at voltages below 4.6 volts. So you wanna check the +5 voltage under load and make sure you don’t have too much cabling. I also check the filtering and +5v line for clear signal. Some of the cheaper crap is inadequate for filtering and will leak AC ripple into the DC and this is really bad for your computer.. sometimes you can hear it and see a rolling effect on the display if it’s bad enough.

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I couldn't find another mention of this so sorry if it's been covered.

Is there a reason why I can't just fit this and do away with the psu completely? (assume I'd use something good like MK brand)

Thanks.

 

image.png.08ac9cc719c4839553ddfd7a626656aa.png

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