8-bit BBC series fetch !BOOT
*OPT 4,0: Off
*OPT 4,1: *LOAD &.!BOOT
*OPT 4,2: *RUN &.!BOOT
*OPT 4,3: *EXEC &.!BOOT

Arthur/RISC OS NetFS fetches !ArmBoot
*OPT 4,0: Off
*OPT 4,1: *LOAD &.!ArmBoot
*OPT 4,2: *RUN &.!ArmBoot
*OPT 4,3: *EXEC &.!ArmBoot

Communicator NetFS fetches !CBOOT
*OPT 4,0: Off
*OPT 4,1: Reserved (*CAT displays Load)
*OPT 4,2: *RUN &.!CBOOT
*OPT 4,3: *EXEC &.!CBOOT

ZX Spectrum NetFS fetches !ZXBOOT
*OPT 4,0: Off
*OPT 4,1: *LOAD &.!ZXBOOT
*OPT 4,2: *RUN &.!ZXBOOT
*OPT 4,3: *EXEC &.!ZXBOOT