RISC OS on Pi with data projector

If anyone is considering doing a presentation with a Pi and RISC OS on a data projector (or other complex connection to a display medium) you might wish to use the following ‘config.txt’ file, suitably amended to select an appropriate display resolution. The ‘kernel’ line specifies a rom image built for 1280×1024 but a rom image configured for a suitable settings is OK as well.

hdmi_group=2
#group-mode: for different resolutions
#1-4:  720p60Hz = 1280x720
#1-19: 720p50Hz = 1280x720
#1-17: 576p50Hz = 1024x576
#2-35: 1280x1024 60Hz
#2-51: 1600x1200 60Hz
hdmi_mode=35
#hdmi_drive reqd for group 1
#hdmi_drive=2
#arm_freq=800
disable_overscan=1
framebuffer_ignore_alpha=1
framebuffer_align=0x100000
init_emmc_clock=100000000
kernel=rpiro1024.img