Zero page

High vector builds of Aemulor now available

November 15, 2017 VinceH

A couple of years ago, RISC OS Open Ltd started building versions of RISC OS with “zero page relocation” – with the memory map changed such that the kernel’s workspace that started at the bottom of the addressable memory was moved to a higher location. This was an important step for security and stability, and for the future of the operating system. However, it wasn’t ever going to happen without some casualties along the way; software that in some way tried to use or access certain information held in that…

NetFetch 4.10 release at Southwest Show

February 26, 2016 VinceH

Announcement from Andrew Rawnsley, 25th February, 2015. We are pleased to announce that version 4.10 of NetFetch will be released at the Southwest Show. This is a free upgrade for existing customers, but that won’t go live until after the show, just in case of tech support issues – better to launch when we’re around to provide assistance.

Important software compatibility notice

July 5, 2015 VinceH

Announcement from RISC OS Open Ltd, 5th July, 2015. Starting from tomorrow, July 5th1, the Iyonix, OMAP3, OMAP4 and Raspberry Pi development ROM images will be making use of “zero page relocation”, a change to the RISC OS memory map which moves the kernel’s “zero page” workspace away from address zero and up to the high end of the memory map. This greatly increases the system’s resilience to a common type of software bug known as a “null pointer dereference.”