Arthur 0.30-1.20

1987-1989

LOGO MISSING

RISC OS 2

1989-1991

RISC OS 2 didn't have a logo and used the archimedes one instead.

RISC OS 3-3.1

1991-1994

RISC OS 3 didn't have a logo and used the acorn one instead

RISC OS 3.5-3.7/NCOS/RISC OS-NC

1994-2000

RISC OS 3.5 still used the acorn logo but has it in better quality due to the switch to 16-bit color depth

the Risc PC technologies logo is also used with it most of the time

RISC OS 4-4.42

RISC OS 4

1999-2001

RISC OS 4 was the first to have a proper logo.

RISC OS Select

2001

RISC OS 4+ (Select Issue 1)

RISC OS Select Issue 2

LOGO MISSING

RISC OS Select Issue 3

RISC OS Adjust32 (A9Home)

2006-

This was a 32-bit version of RISC OS 4 customized for the A9Home line of small-form-factor computers.

RISC OS 5

2003-present

RISC OS Six

2007-2009

BETTER LOGO NEEDED

RISC OS Pi

2014-present

RISC OS Direct

2020-present