Autopsy:

After 8 long months of waiting i finally received the Ultimate 1Mb module by Candle’o'Sin.

The Ultimate 1Mb module is a expansion for Atari XE/XL.

This module allows a easy installation regardless of machine type one chooses and is not intrusive to original hardware. The Ultimate 1Mb was designed to fit in any XL/XE computer, including 1200XL and XEGS – there are no versions as such, the only diffrence might be with lenght of ribbon cables it connects to motherboard

Features:

• To be as much solderless as possible (only RW, PHI2, HALT and RESET lines need soldering)
• Fully flashable SpartaDOS-X with up to 320kbytes for its purposes
• RTC module for SDX with battery backup and NVRAM
• Fully flashable 4 OS ROM slots
• Hardware WRITE PROTECT for 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)
• System select/Memory exp mode select from integrated BIOS

source: spiflash.org atariage.com