From: Christophe Leroy > Sent: 05 September 2020 08:16 > > Le 04/09/2020 à 23:01, David Laight a écrit : > > From: Alexey Dobriyan > >> Sent: 04 September 2020 18:58 ... > > What is this strange %fs register you are talking about. > > Figure 2-4 only has CS, DS, SS and ES. > > > > Intel added registers FS and GS in the i386 I know, I've got both the 'iAPX 286 Programmer's Reference Manual' and the '80386 Programmer's Reference Manual' on my shelf. I don't have the 8088 book though - which I used in 1982. The old books are a lot easier to read if, for instance, you are trying to work out how to back and forth to real mode to do bios calls. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)