The AMD Am2900 is a family of 4-bit bit-slice chips designed by Advanced Micro Devices and introduced to the market in August 1975. Each component represents an individual unit in a microprocessor. Designed to be flexible and expandable, those chips were capable of emulating a large number of existing systems. Made in bipolar technology allowed for higher speeds (8.3-12Mhz, later up to 32). Its flexibility, higher speed, unusually large amount of 2nd sources, and good marketing allowed AMD to dominate the bit-slice market. To date, the Am2900 family is used as the de facto baseline for bit-slice design.

Family Members
Part	Description
AM2901 AM2901A AM2901B	4-bit ALU
AM2902	Carry-lookahead generator
AM2903 AM2903A	4-bit ALU, Enhanced version of the 2901
AM2904	Status and shift control unit
AM2905	Quad 2-input bus transceiver
AM2906	Quad 2-input bus transceiver with parity
AM2907 AM2908	Quad bus transceiver with interface logic
AM2909 AM2909A AM2911	4-bit-slice address sequencer
AM2910	12-bit address sequencer
AM2912	Quad bus transceiver
AM2913	Priority interrupt expander
AM2914	Priority interrupt controller
AM2915 AM2916 AM2917	Quad 3-state bus transceiver
AM2918 AM29LS18	Quad D register
AM2919	Quad register
AM2920	Octal D flip-flip register
AM2921	1-to-8 decoder
AM2922 AM2923	8-input MUX
AM2924	3-to-8 decoder
AM2925	Clock generator
AM2926 AM2929	3-state quad bus driver
AM2927 AM2928	Quad 3-state Bus Transceiver
AM2930	Program control unit
AM2932	Program control unit for push/pop stack
AM2940	DMA Address generator
AM2940	Timer/Counter/DMA Address generator
AM2946 AM2947 AM2948 AM2949	Octal 3-state bidirectional bus transceiver
AM2950 AM2951	Bidirectional I/O Port
AM2954 AM2955	Octal registers
AM2956 AM2957	Octal latches
AM2958 AM2959	Octal buffer
AM2960	16-bit error detection and correction unit
AM2961 AM2962	4-bit error correction bus buffer
AM2964	Dynamic memory controller
AM2965 AM2966	Octal dynamic memory driver

2nd sources

The Am2900 had a large number of 2nd sources:

• Elektronika
• Fairchild
• Motorola, October 1975
• National
• NEC
• Raytheon, December 1975
• Signetics
• Thomson-CSF
• Vitesse, November 1985

Design

The family includes two 4-bit ALUs - 2901 and a 2903. The AM2901/A was the original chip designed, supporting 8 different basic operations. The AM2903/A was an enhanced version designed a bit later which included 7 additional operations. The slices can be stacked to produce 8, 12, or 16 data paths and memory addresses for use in larger programs.

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