The CPU architecture was developed long before the joint venture. IIRC, it began as an expansion board for the BBC Micro. This article implies that initial AR

The CPU architecture was developed long before the joint venture. IIRC, it began as an expansion board for the BBC Micro. This article implies that initial ARM development was undertaken between 1983 - 1985: https://www.theregister.com/2012/05/03/unsung_heroes_of_tech_arm_creators_sophie_wilson_and_steve_furber/ https://www.theregister.com/2012/05/03/unsung_heroes_of_tech...