Category Archives: news

New Ultimate 1MB, Incognito Firmware and SIDE/SIDE2 Loader Update

Another firmware update for Ultimate 1MB, Incognito including Main BIOS, PBI BIOS and SIDE XEX Loader, plus updated XEX Loader for SIDE/SIDE2. New features include:

  • Unified user interface for both main BIOS and XEX Loader
  • Improved SIO2BT support
  • High-speed SIO support for PCLink and other serial devices
  • Improved CF card hot-swap handling in PBI BIOS and loader
  • Improvements to keyboard and joystick handling
  • Various bug fixes

The updates (and corresponding documentation) may be downloaded via the firmware page. Please see the heavily revised user manual for details of the new features – in particular the SIO driver section.

Ultimate 1MB, Incognito and SIDE BIOS/Loader Update

New updates for Ultimate 1MB, Incognito and SIDE/SIDE2 may be found in the firmware section of the site. New features include:

  • Loader: joystick operation augmented by console key home, page down and page up navigation keys (primarily aimed at XEGS with keyboard disconnected)
  • Loader: joystick control generally improved with proper debounce and better auto-repeat
  • Loader: position in file or option list now preserved when moving between menus
  • Loader: minor bug fixes
  • Main BIOS: config changes requiring reboot now detected when swapping profiles
  • Main BIOS: dual-level HDD write lock (see below)
  • PBI BIOS: SIO2BT automatically handled by high speed SIO handler (simply enable HSIO for the appropriate drive)
  • PBI BIOS: HDD writes can now be blocked at the partition or physical disk level (meaning writes to the MBR and partition table may be completely blocked once the media is partitioned)
  • PBI BIOS: Patch vectors for RAM-based IO driver code

Ultimate 1MB, Incognito and SIDE “Alt” Firmware Released

After a year of development and nine months of public beta testing, release versions of the “Alt” firmware (Main BIOS, PBI BIOS and XEX Loader) for U1MB and Incognito are finally available for download, along with an updated User Manual and newly written Technical Documentation. Also available is the new stand-alone XEX Loader for the SIDE/SIDE2 cartridge.


Ultimate 1MB Firmware Downloads

Incognito Firmware Downloads


As well as correcting any issues over the coming weeks, I will also be adding complete sample flash ROM images (including the WIP Graphical OS) and uploading a small library of plugins for the U1MB BIOS (including a plugin supporting the new Rapidus board).

New Ultimate 1MB/Incognito Beta BIOS

After two months of development, a new (beta) BIOS is available for the Ultimate 1MB:

Ultimate BIOS Beta 0.24 Release

Features of the new BIOS include:

  • The ability to set the date and time from the setup menu
  • Dual configuration profiles
  • Categorized menus covering system settings, hard disk, device setup, etc
  • Turbo-Freezer compatibility
  • Customisable shortcut keys
  • OS-independent Ultra-speed SIO for serial disk drives
  • Optional BIOS logo screen and boot device selection menu
  • Optional flash write protection
  • System information page displaying CPU type, audio/video hardware, etc
  • BIOS Plugin API for diverse hardware control (Ultimate 1MB only)
  • Variable SpartaDOS X ROM sizes (192, 256 and 320KB)

A near identical version of the BIOS for Incognito will follow shortly. If you have comments, questions or suggestions, please visit the corresponding thread on the AtariAge forum.

Atari8 Site Re-launch

Having finally overcome various hosting and other technical issues, I’m pleased to announce that is now back online. While more new content is in the pipeline, you can already download brand new SpartaDOS X 4.47 APT ROMs here.