Mamemeister Posted January 28, 2015 Share Posted January 28, 2015 Chaps, appreciate a spot of help please. Is the CX853 16K memory cart compatible with the Atari 400 or is it only for the Atari 800? Thanks in advance. Quote Link to comment Share on other sites More sharing options...
+sm3 Posted January 28, 2015 Share Posted January 28, 2015 Chaps, appreciate a spot of help please. Is the CX853 16K memory cart compatible with the Atari 400 or is it only for the Atari 800? Thanks in advance. If I'm not mistaken, it's the same board minus the case for the 400. There is a 48K board for the 400, but there is a slight bit of modification that needs to be done for it to fit due to the size. And of course soldering a few wires. Best Electronics sells both the 16K and 48K boards: http://www.best-electronics-ca.com/800.htm Quote Link to comment Share on other sites More sharing options...
Mamemeister Posted January 28, 2015 Author Share Posted January 28, 2015 Ah so it should fit if the case is removed? Quote Link to comment Share on other sites More sharing options...
+sm3 Posted January 28, 2015 Share Posted January 28, 2015 Yes. Obviously you have to open the case on the 400 to replace the board of course. Here is an excerpt from the service manual: 4.3.5 RAM Memory BoardsThe ATARI 400 and 800 Computers come equipped with either 8K or 16KRAM memory boards. The 8K and 16K RAM memory boards are the sameexcept for the 8K or 16K ememory chips and the addition of connectorjumpers on the 8K RAM memory boards... Quote Link to comment Share on other sites More sharing options...
+sm3 Posted January 28, 2015 Share Posted January 28, 2015 Also from the service manual, notice the parts list: 6.2 SPARE PARTS LIST The following is a list of the minimum spare parts that are to bemaintained at an authorized Service Center: Description Part No. Quantity 800 Motherboard CAO14829 1400 Motherboard CAO14807 1800 Power Supply CAO14171 2400 Power Supply CAO14155 2CPU Printed Circuit Board CAO14800 2lOK ROM Printed Circuit Board CAO14090-01 116K RAM Printed Circuit Board CAO14802 28K RAM Printed Circuit Board CAO14802 1 No separate board for 800/400 for RAM anyway. Obviously the 800 holds a few more RAM boards than the 400. Quote Link to comment Share on other sites More sharing options...
ACML Posted January 28, 2015 Share Posted January 28, 2015 If you are going to the expense and time to tear open your 400, spend the $30 and get the 48K RAM board. It will run anything an 800 will. There are only four wires to solder on the bottom of the board. Very easy. Quote Link to comment Share on other sites More sharing options...
BillC Posted January 28, 2015 Share Posted January 28, 2015 Your profile doesn't list your locale, but you should be aware that some PAL 400 users have reported corrupted video with the Atari 48K board. Quote Link to comment Share on other sites More sharing options...
Paul Westphal Posted January 29, 2015 Share Posted January 29, 2015 I third that. Get the 48k board before I buy them all. 1 Quote Link to comment Share on other sites More sharing options...
scottinNH Posted March 18, 2017 Share Posted March 18, 2017 I third that. Get the 48k board before I buy them all. Looks like I waited too long - they seem to be all gone. :-) Has anyone done anything like turn the schematic into a set of gerber files (for a small/cheap PCB run at OSH Park)? I'm assuming "no" since I haven't found much in the Internet about Atari and making new (cloning existing) PCBs (just the SIO breakout board I found on OSH, and ordered). I don't have a lot of experience with schematics or drawing circuits - just know enough to import an Eagle file. I'd really love to upgrade this 400 but all the memory kits are gone. Quote Link to comment Share on other sites More sharing options...
BillC Posted March 18, 2017 Share Posted March 18, 2017 The post linked below has instructions on modifying a stock 16K RAM card to 48kB. http://atariage.com/forums/topic/123207-expanding-the-400/?do=findComment&comment=1488304 Quote Link to comment Share on other sites More sharing options...
scottinNH Posted March 18, 2017 Share Posted March 18, 2017 The post linked below has instructions on modifying a stock 16K RAM card to 48kB. http://atariage.com/forums/topic/123207-expanding-the-400/?do=findComment&comment=1488304 Thanks -- saved it to my Google Docs for later... My own fault, I saw those boards at Best when they were much cheaper, and I didn't get around to making the purchase. Oh well... Quote Link to comment Share on other sites More sharing options...
johannesmutlu Posted November 29, 2023 Share Posted November 29, 2023 Is it also possible to ubgrade the atari 400 ram to just 24KB or 32KB WITHOUT the need for soldering wires to the board??? https://www.atarimagazines.com/v2n4/400upgrade.html It says ‘By April a third version of Mosaic's expansion board (requiring a third printing of its owners manual, identified on the back cover as No. 229D) was already being shipped. This board eliminates messy soldering to the ROM cartridge socket, works in either a 400 or an 800, and, most pleasantly, carries a $50 price reduction to $199.95. The newest manual, with almost twice as many pages, offers more photos and even simpler step-by-step instructions for installation in either computer. The computer must be completely disassembled, exercising great care in lifting the 22-pin socket on the power board from its connector’. It sort off says ‘Mosaic's expansion board known as No. 229D) was already being shipped. This board eliminates messy soldering to the ROM cartridge socket, works in either a 400 or an 800’ if that’s true then i may don’t have to do any soldering right??? but does it only works with 24KB,32KB or also 48KB??? anyway if i could upgrade to 24KB or 32KB without the hassle of soldering,and if homebrew mariobros will work on it that way as well???,then i might considering buying a 32KB expansion module for my atari 400, would be great in such case. thanks alot😁 Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted November 29, 2023 Share Posted November 29, 2023 If you can find a card, you can upgrade a 400 to 32k without soldering. Only 4 wires need soldered on, though, to be able to upgrade the 400 to 48k or even to 1,056k. 2 Quote Link to comment Share on other sites More sharing options...
ClausB Posted November 29, 2023 Share Posted November 29, 2023 This topic should help: Quote Link to comment Share on other sites More sharing options...
bfollowell Posted November 30, 2023 Share Posted November 30, 2023 The 400 I was gifted came with a 32KB card, a Mosaic I think, but I'm not 100% certain, so I know there are, or at least, were plug-n-play options. Quote Link to comment Share on other sites More sharing options...
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