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you would need antic and gtia plus some parts you can pick up in any store

the only thing left to get is crystal you need to change - you may pull that out from broken pal XL board, or buy from one of atari suppliers

 

mine was ntsc, but now is 100% PAL

 

This is INTERESTING ... Could you tell me more about those 'some parts'?

 

And why is it so much harder to convert 1200xl from NTSC to pal?

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1200xl?

you get Lenore's adapter and you're done with NTSC/PAL conversion for 1200XL

 

i'll make a photo of CPU board when i'll return from the copy party - possibly with labels on components that were added

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1200xl?

you get Lenore's adapter and you're done with NTSC/PAL conversion for 1200XL

 

Can't wait to get mine fitted! :)

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Hi,

And why is it so much harder to convert 1200xl from NTSC to pal?

 

Hmm, this isn´t "hard". You´ve only to change the ANTIC & GTIA against PAL versions, replace the system crystal and add a little circuit to generate the PAL color clock @ 4,43 MHz.

 

post-15670-0-16050900-1343305034_thumb.jpg

 

This was one of my first conversions to PAL.

 

Regards, Juergen

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Hmm, this isn´t "hard". You´ve only to change the ANTIC & GTIA against PAL versions, replace the system crystal and add a little circuit to generate the PAL color clock @ 4,43 MHz.

 

Ah... we could have used your help when Lenore was designing the adapter board. :) I tried to build one similar to the one in your picture, but it never worked for s**t.

 

Anyway: Lenore's adapter (now working fine, I'm told) sits in the GTIA socket, and is almost a solderless upgrade (still need to change the master crystal, of course).

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Is the crystal (on the old Beige 800) located on the CPU/ANTIC/GITA card, or on the motherboard? If it is on the CPU card, could you then change a machine back and forth by merely swapping the NTSC CPU card for a PAL one?

 

Sloopy! Can you "make" PAL 800s one day? :)

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The crystal is unfortunately on the motherboard. The other thing too, the CPU card is installed under the nuclear bomb proof shielding. It takes forever to get at it. It's possible that a board which allows for selectable crystals could be made, but IIRC, there is a bit of additional circuitry besides just the crystal needed, to get the proper colourburst divisor.

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Is there already a pre order thread going? I certainly do not want to miss this for my 1200xl!!!

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Is there already a pre order thread going? I certainly do not want to miss this for my 1200xl!!!

 

I think Lenore will start a pre-order when she's made some minor amendments to the board. You're not missing out, though! ;)

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Hi,

 

Ah... we could have used your help when Lenore was designing the adapter board. :) I tried to build one similar to the one in your picture, but it never worked for s**t.

Anyway: Lenore's adapter (now working fine, I'm told) sits in the GTIA socket, and is almost a solderless upgrade (still need to change the master crystal, of course).

 

Of course I will help, when I can. But I do nothing special ;-)

 

The little circuit for the PAL generator is 1:1 used from the 800 XL schematics, I use all the components like in a stock 800 XL.

 

Jürgen

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Sebastian,

 

I just received an Atari 800 and although it had some unfortunate moments traveling from USA to Greece, I would realy like to have one incogito board for it, please.

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i'll get back to everyone who send me PM about additional incognito boards in a day or two, currently i want to have first panel assembled by hand and design verified

at this moment 3 chips from each board are missing, bottom side is fully populated, top is missing some parts

hopefully i'll do it today (well, when i wake up)

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ok laidies

here is first panel and the only panel i've assembled manually to verify the design

DSC02500.JPG

Edited by candle
  • Like 3

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I like what I see. Have one question for you. Does this upgrade have r/w ram at $d700--$d7ff? The reasion I ask is the Ultra-Speed OS that Bob Puff created uses sram mapped into $d700--$d7ff.

 

 

Thanks Steve

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it has R/W ram at d700-d7ff, but it's there for internal PBI device

what is ultra-speed os? does it has any advantages over Hias modified stock os?

having $d700-$d7ff mapped constantly as RAM will cause incompatibilities with extensions like VBXE or MIO, so i would rather walk away from this

 

anyways, here is updated list, please check if everything is as it should be

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it has R/W ram at d700-d7ff, but it's there for internal PBI device

what is ultra-speed os? does it has any advantages over Hias modified stock os?

having $d700-$d7ff mapped constantly as RAM will cause incompatibilities with extensions like VBXE or MIO, so i would rather walk away from this

 

anyways, here is updated list, please check if everything is as it should be

The CSS US+ OS has some extra features, these include a configuration menu which allows remapping drives, a built-in RAMdisk handler which recognizes any size XE-type memory upgrade up to 2MB, and an enhanced memory test routine which has been rewritten and tests all of the available memory.

 

Information about all the features can be found on Bob Puffs current website: http://www.nleaudio....ss/products.htm. The information provided doesn't mention anything about SRAM being part of the module but it is only describing the features, not the technical details.

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ok laidies

here is first panel and the only panel i've assembled manually to verify the design

DSC02500.JPG

 

This should fit my modded 800 perfectly!!

post-11578-0-22946500-1344278828_thumb.jpg

  • Like 2

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ok laidies

here is first panel and the only panel i've assembled manually to verify the design

 

 

This should fit my modded 800 perfectly!!

 

That has some really rough-looking plastic joints. ;-)

 

(Your copy of photoshop needs the sandpaper plugin.)

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As far as I read here there are still a few boards available, so I want to get one.

 

(I am lucky that I havn´t sold it 27 years ago, it is still MY computer. I would not sell it for 500€)

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This should fit my modded 800 perfectly!!

 

"Alert Alert !

This is Battleship Galactica, attention to all our Star Raider pilots - our long range scanners have just detected new forms of Zylon base stars..."

 

Original:

 

post-3782-0-28925500-1344530996_thumb.jpeg

 

New Form:

post-3782-0-76388900-1344531035_thumb.jpg

 

;-) ;-) ;-) Andreas Koch.

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