From XenonLibrary
Jump to navigation Jump to search
Part NumberX815842
IntroducedLate 2008
Used InXbox 360 (Original)
CPU TypeLoki
GPU TypeZeus
CPU Process65nm
GPU Process65nm
eDRAM Process90nm
Nand Size16MB, 256MB, 512MB
Video OutputsA/V and HDMI
12V Amperage12.1A

Jasper is the successor to the Falcon motherboard and is used in the Original Xbox 360 series. The production board is known as Jasper_A1.

Notable Differences

A July 2009 Jasper_A1 with a Kronos GPU
  • The Rhea GPU has been replaced with the Zeus GPU
  • Hynix H5RS5223CFR-14C and Hynix H5RS1H23MFR-14C RAM were added as options
  • The XSB Southbridge has been replaced with the PSB Southbridge
  • Arcade Jaspers came with 256MB (later 512MB) nand chips that combine system storage and a Memory Unit
  • Traces and pads for an additional flash controller (referred to as "DUMBO" or "PANDA") have been added, but never populated
  • Very late Jaspers manufactured in July 2009 come with the Kronos GPU instead of the Zeus GPU
  • Some boards use solid state capacitors for the CPU and GPU output filters
  • Some of the boards no longer have glue applied around the CPU and GPU




First Jasper version, uses the XSB southbridge. Only used for EV, never used in production retail units.


Same as Jasper_A0, but with the PSB southbridge. This is the version that was used in production.


An Advanced board with the Zeus GPU

Advanced, or Jasper Advanced, is a slightly modified Jasper_A1 for the Xbox 360-GB Development Console and its prototypes. Support for 1GB of RAM was added by routing the 13th addressing line. Other minor changes and cleanup were made. Early versions use the Zeus GPU, while later boards used Kronos.


Tonasket, initially known as Jasper_B, is a revision of Jasper. Changes include use of the Kronos GPU and board layout cleanup.