Correct MAC endianness
The MAC address when encoded as a Dallas unique id is in network byte order. For example, a Risc PC returns OS_ReadSysInfo 4 with r0=&A4123456 r1=&0000 because Acorn's EUI is 00:00:A4.
The MAC address when encoded as a Dallas unique id is in network byte order. For example, a Risc PC returns OS_ReadSysInfo 4 with r0=&A4123456 r1=&0000 because Acorn's EUI is 00:00:A4.