Ultimate 1MB Upgrade

      Ultimate is one of the best ATARI 8bit internal upgrades ever, invented by Sebastian Bartkowicz aka Candle`o`Sin.  Installation of this upgrade can take 5 minutes or it can take two hours.  Depends on if your machine is socketed or not.

     It's easy, it's simple, it's FUN!  However, you are accepting ALL responsibility for anything you do to your machine.  That is VERY much on you.

I use these primarily for 1088XEL & 1088XLD builds, but you can put them in your XL/XE machine as well.  

Features

• These are the NEWEST 2026 version just released by Lotharek
• As solder-less as possible (only RW, PHI2, HALT and RESET lines need soldering when MMU and OS rom are socketed) and you can avoid that by using our soon to be available SALLY adapter
• fully flashable SpartaDOS-X with up to 320kbytes for its purposes
• Real Time Clock module for SDX with battery backup and NVRAM
• fully flashable 4 OS ROM slots
• hardware WRITE PROTECT for the whole Flash array
• configurable memory expansion with 4 modes of operation (disabled, 320k RAMBO, 578k COMPY SHOP, 1088k RAMBO)
• customizable BASIC and MISSLE COMMAND slots (also flashable)
• compatible with all XL/XE machines (600XL needs 64kB of RAM first)

Inside BOX :

• high quality Ultimate BOARD 
• HARTING MMU ADAPTER 20 IDC Female cable
  
• HARTING OS ROM ADAPTER  28 IDC FEMALE ADAPTER 
  
• 4pin connection cable
• fitting items

NO installation manual is included, but you can reference Lotharek's site >HERE<