Motorola MC14500B

[citation needed][clarification needed] The ICU was conceived by Vern Gregory in the mid-1970s while working as an engineer in a marketing / applications group of Motorola Semiconductor Products Sector in Phoenix, Arizona, USA; Brian Dellande originated circuit and sub-routine designs, and co-wrote the manual; Ray DiSilvestro was the bench technician; Terry Malarkey provided management support.

[citation needed] In the CMOS Logic Division in Austin, Texas, USA (where it was made) Phil Smith was the chip designer; Mike Hadley provided product applications support.

[citation needed] A form of the design served as an embedded controller in a custom automotive chip made for Nippon Denso by Motorola—Japan.

Băneasa manufactured a clone of the MC14500B with the designation βP14500 in IIL technology (rather than the original CMOS).

It is certified as Open Source Hardware PL000011 so anyone can learn from its design and can freely build it.