I had previously bought one of Brian's 1056k Axlon compatible RAM boards which has allowed me to run my Atari 800 with a massive 1008k ramdisk, all without modifying the computer in any way. However the time it takes to copy even a modest collection of files to a ramdisk of that size at standard SIO speed is painfully slow. With Brian's directions I was able to apply the battery backup mod so the files wouldn't need to be copied across every time the computer was rebooted, which was a vast improvement. Still, when you've experienced high-speed SIO, standard SIO feels like going back to the old days of 300 baud modems! I needed a way to get an OS patched with the high speed SIO modifications, again preferably without having to physically modify the 800.

I sent a quick question to Brian about the RAMROM 2024 board and he confirmed that the high speed SIO was available with the ROMs installed by default on the banked flash ROM in the board. So this was a no-brainer, I placed an order immediately!

After another flawless Trans-Atlantic shipping experience, I had the board in about a week and data was soon zipping about between my Atari 800, FujiNet and the battery-backed Axlon ramdisk.

As my 800 is a PAL model, the installed OS is the OS-A PAL variant, while the flashed ROMs all seem to be based on OS-B NTSC. I briefly swapped the OS ROM chips from my original OS module to give an option of running the original PAL OS, but I don't know what differences there are between the PAL and NTSC ROMs, everything so far appears to work as normal with the NTSC ROM. But I had to return the ICs to the OS Module, so tracking down a spare CX801-P to get the correct PAL A chips is on my list of things to do. Those empty IC sockets are just begging to be populated.

I was able to create my own image containing the PAL A OS revision (along with some others) and flash my own ROM collection. All simple and quick to do with the information in the RAMROM manual and an EPROM burner. Brian has created an 'OS-C' OS that I am currently trying out.

I have not yet tried the Mosaic banked RAM, but the board does enable RAM in the $C000-$CFFF range, giving 52k of accessible RAM.

If you have a stock Atari 800 and want to keep it that way, this is another 'must-have' upgrade, I can't recommend it highly enough.

The Atari 800 was the computer I longed for in the early 80s when I was getting into home computing. But it was insanely expensive at the time so the best I could get was an Atari 400, just as they were being sold with the maximum 48K RAM. I loved the Atari 400, even the keyboard, but I still wanted an 800. Eventually I upgraded to a 130XE with 128K.
Many years later I got my dream computer, finding an 800 on eBay. It only had 16K but I got enough memory modules to expand to the full 48K. By this time I also had another 130XE and an 800XL upgraded with an Ultimate 1MB card so the 800 was sitting there, crying out for more memory. But the last thing I wanted to do was start dismantling my pride and joy and make irreversible changes with a soldering iron . What to do?
When I read on AtariAge about this 1056K board and that it didn't require any modifications I knew I had to have it. And it really was that simple, remove the memory modules, install the two boards in the correct slots in the 800. Then I configured an Axlon ramdisk to give me an instant megabyte of fast, if temporary, storage.
But better news was awaiting, the 1056k board can be easily modified to allow battery backup of the memory, preserving the contents of the ramdisk while the computer is powered off. With clear instructions from the vendor, I just had to source an appropriate IC to control the NVRAM, I was able to modify the board and now have a battery backed ramdisk in my Atari 800. And if I decide to return it to stock condition, I just unplug the cards and replace them with the original modules.
This really is the easiest modern memory upgrade I have seen for the Atari 800 and is worth every penny.
Any questions I asked the vendor about upgrading the board were answered almost immediately, communication was excellent.
Shipping was remarkably smooth considering I am in the UK and have experienced all sorts of delays and charges when buying from the US, but shipping from 5cfab is fast and hassle-free.

Received this in Warp Speed Fast fashion! Excellent packaging, excellent fit around the RAM board, and in the Atari 800XL; with FujiNet device. Was looking for awhile to protect the RAM Expansion board from ESD, in case I might need to carry the computer around somewhere. Happy with the purchase!

If you have basic soldering skills this board is easy to install and works great, no problems at all.
Thank you.

I'm not much on electronics and this was simple to install and run. I use the sdrive max and the ultimate cart and seem to be doing great. Prince of Persia works like the original I played many years ago I thank you for the product, and the cost was also good , these days one game for the xbox one would run the same. i use it on a 800xl