The Texas Instruments SBP0400 (SBP = silicon bipolar), also known as SBC 0400 and X0400, is a microprogrammable 4-bit slice processor that was introduced in 1976 (delivery began in December 1975).[1] It was one of the first LSI processors and was the first device in the USA based on I²L technology (integrated injection logic).[2] It was used for research and teaching purposes in the aerospace industry (NASA)[2] and in the learning computer LCM-1001 (Texas Instruments, 1976). This microprocessor learning computer was probably the company's first.[3]
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