Hi, IBM has released the POWER10 ISA doc. It includes specifics on the optional Power-compliant levels. https://ibm.box.com/s/hhjfw0x0lrbtyzmiaffnbxh2fuo0fog0 Same, but wgettable, as the above only works in a browser: https://ibm.box.com/shared/static/hhjfw0x0lrbtyzmiaffnbxh2fuo0fog0 - Lauri