AMD 2901 bit-slice processor family

AMD 2901 bit-slice processor family includes 2901 and 2903 4-bit microprocessors slices, 2909 and 2911 microprogram sequencers, 2910 microprogram controller and other support chips. The 2901 processor consists of 16 4-bit registers, 4-bit ALU and associated decoding/multiplexing circuits. The ALU accepts 9-bit microinstructions that specify source operands, ALU function and the destination register. The 2901 ALU can perform 8 different functions (they are encoded into 3 bits within the microinstruction): addition, subtraction and logic operations. Multiple 2901 bit-slice processors could be combined together to build microprocessors with any data width (in 4 bits increments).

Enhanced version of 2901, AMD 2903 has 9 new special ALU functions used for implementation of multiplication, division and normalization operations. The number of arithmetic and logic ALU functions in 2903 was increased to 15.

Die pictures:
Use the filter below to display manufacturers that have specific feature(s) incorporated:

List of 2901 manufacturers


40-pin side-brazed ceramic DIP
White ceramic/Black top/tin pins

Picture of: AMD AM2901DC

Cypress Semiconductor CY2901CPC

40-pin plastic DIP

Picture of: Cypress Semiconductor CY2901CPC

Motorola MC2901LC

Motorola was the first second-source manufacturer for 2900 line of devices. They signed the license agreement with AMD in October - November 1975. Motorola manufactured bipolar versions of 2901 and 2903 bit-slice processors and support chips.

Picture of: Motorola MC2901LC

National Semiconductor IDM2901A-1DC

40-pin side-brazed ceramic DIP
Purple ceramic/Gold top/gold pins

Picture of: National Semiconductor IDM2901A-1DC


40-pin side-brazed ceramic DIP

Picture of: NEC B2901AD

Raytheon AM2901ADC

Raytheon was the second company, after Motorola, to sign 2900 second-source agreement with AMD. The license, that was signed in November - December 1975, allowed Raytheon to manufacture 2901 bit-slice processor and support chips.

Picture of: Raytheon AM2901ADC

Thomson TS2901BCJ

40-pin ceramic DIP

Picture of: Thomson TS2901BCJ

Signetics N2901-1I

40-pin side-brazed ceramic DIP
White ceramic/black top/tin pins

Picture of: Signetics N2901-1I

USSR 1804VS2

Soviet clone of AMD 2903 bit-slice processor.
Manufactured by scientific production association "Elektronika".

Picture of: USSR 1804VS2

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At a glance

4-bit bit-slice processor
Frequency (MHz):
8.3 - 32