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Another ordinary Atari 65XE or is it.......?


Hellraiser
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That crystal is 1/5th the PAL N frequency of 3.58205625MHz. Freddie needs a clock 4X the color clock, so that board must produce an overtone of 20X the crystal base frequency.

looks to me like it's not 1/5, but 2X the PAL N frequency, so it's producing a 2X overtone of the base crystal frequency. 20X would be quite a bit. The crystal is labeled 7164.112

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looks to me like it's not 1/5, but 2X the PAL N frequency, so it's producing a 2X overtone of the base crystal frequency. 20X would be quite a bit. The crystal is labeled 7164.112

The problem is, they've replaced the 14.318MHz crystal with that board. Freddie needs a fast clock it can divide down and make RAS and CAS from.

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So this would be an NTSC board to begin with? It seems to have the spot where the PAL colourburst crystal would otherwise go.

 

Seems there'd be little point using a PAL board to begin with since the required clocks have a direct relationship.

 

Bryan - why would it need 20x ? The machine looks to be essentially NTSC but with a slightly faster clock. Crystal being used here is slightly over 1/2 what a normal XE has.

 

One thing for sure - what we have here is an overclocked Atari, if only 1.791028125 Mhz vs 1.7897725 MHz for normal NTSC.

Grand total of about a 0.07% faster CPU.

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  • 4 years later...
On 1/12/2016 at 12:14 PM, Hellraiser said:

From the top it looks like any other 65XE.

 

post-37515-0-62710400-1452611472_thumb.jpg

 

but from the bottom it looks different.

 

post-37515-0-83633200-1452611520_thumb.jpg

 

Who had thought Atari's were "made" in Argentina. ;)

I have the same one! Is your Atari working? Mine doesn't show any image.

Do you know where to begin? I'm new on Atari and this my new little project , so any ideas are welcome.

Mine doesn't have that rare board connection and have signs of been repaired some time along (I added zooming pics of that parts)

 

Here are some pics of the board:

 

 

 

 

 

IMG_4750.JPG

IMG_4751.JPG

IMG_4740.JPEG

IMG_4741.JPEG

IMG_4742.JPEG

IMG_4743.JPEG

IMG_4744.JPEG

IMG_4745.JPEG

IMG_4746.JPEG

IMG_4747.JPEG

IMG_4748.JPEG

IMG_4752.JPG

IMG_4753.JPG

IMG_4754.JPG

IMG_4758.JPG

IMG_4760.JPG

IMG_4765.JPG

IMG_4749.JPEG

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On 1/12/2016 at 3:14 PM, Hellraiser said:

From the top it looks like any other 65XE.

 

post-37515-0-62710400-1452611472_thumb.jpg

 

but from the bottom it looks different.

 

post-37515-0-83633200-1452611520_thumb.jpg

 

Who had thought Atari's were "made" in Argentina. ;)

 

I love that bottom label which implies the input voltage to the unit is 220 VAC 50Hz, that

would make a nice bang followed by copious amounts of flames and smoke ☠️

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Could anyone help me with this?

8 hours ago, Jangle said:

I have the same one! Is your Atari working? Mine doesn't show any image.

Do you know where to begin? I'm new on Atari and this my new little project , so any ideas are welcome.

Mine doesn't have that rare board connection and have signs of been repaired some time along (I added zooming pics of that parts)

 

Here are some pics of the board:

 

 

 

 

 

IMG_4750.JPG

IMG_4751.JPG

IMG_4740.JPEG

IMG_4741.JPEG

IMG_4742.JPEG

IMG_4743.JPEG

IMG_4744.JPEG

IMG_4745.JPEG

IMG_4746.JPEG

IMG_4747.JPEG

IMG_4748.JPEG

IMG_4752.JPG

IMG_4753.JPG

IMG_4754.JPG

IMG_4758.JPG

IMG_4760.JPG

IMG_4765.JPG

IMG_4749.JPEG

Could anyone help me with this?

Edited by Jangle
Grammar
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  • 2 years later...
1 hour ago, manterola said:

Now an 800XL made in Argentina. I guess there is no freddy chip in this one.

image.thumb.png.9852446eb27c19a2dd118e26e7211f47.png

i wouldnt bet, that part of the world got machines later and produced later. Anything is possible. Would love to see insde

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Argentina and its infamous PAL-N standard... at least Brazil used PAL-M, which encoded color using PAL but had the same framerate and frame size (60Hz, 525 lines) as regular NTSC (NTSC-M), and the same channel bandwidth (6MHz). PAL-N used PAL color encoding at 50Hz and 625 lines(like regular PAL-B/G), but TV channels used 6MHz bandwidth, like NTSC, not 7MHz like European PAL B/G, which meant the sound carrier was located at a different frequency, as well as the color sub-carrier. No  wonder multisystem VCRs were really popular in Argentina... I think no other country in the world used the same combination. Well, except maybe their neighbors Uruguay and Paraguay.

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