AMD Am2900
Am2903 Enhanced ALU
Developer	AMD
Manufacturer	AMD
Type	microprocessors
Production	1975-1998
Architecture	4-bit bit-slice
Word size	4 bit 0.5 octets 1 nibbles
Technology	Bipolar
Clock	1 MHz-31 MHz
Package	DIP40, FP42

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 (1-20Mhz, 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. The Am2900 family became very popular then and was used as the de facto baseline for bit-slice design.

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 to provide a more sophisticated 3-port, 3-address architecture, including 7 additional operations to support multiplication and division. The slices can be stacked to produce any multiple of 4-bit wide data path (8, 12, 16, 32, etc. bits) and memory address for use in larger systems.

This section requires expansion; you can help adding the missing info.

2nd sources

The Am2900 had a large number of 2nd sources:

75	76	77	78	79	80	81	82	83	84	85	86	87	88	89	90	91	92	93	94	95	96
Motorola
Thomson-CSF
Raytheon
		National
			Fairchild
			Signetics
			NEC
					OKI
										Cypress
											Vitesse
											Elektronika

Members

Family Members
Part	Description	Pin count
AM2901 AM2901A AM2901B	4-bit ALU	40, 42
AM2901C	4-bit ALU, internal ECL circuitry, ultrafast plug-in replacement for the 2901B	40, 42, 44
AM2902	Carry-lookahead generator	16, 20
AM2903 AM2903A	4-bit ALU, enhanced version of the 2901	48, 52
AM29203	4-bit ALU, enhanced version of the 2903 supporting BCD arithmetics	48, 52
AM2904	Status and shift control unit	40, 42, 44
AM2905	Quad 2-input bus transceiver	24
AM2906	Quad 2-input bus transceiver with parity	24
AM2907 AM2908	Quad bus transceiver with interface logic	20
AM2909 AM2909A	4-bit slice cascadable microprogram address sequencer	28
AM2910 AM2910A	12-bit microprogram address sequencer and controller	40, 42, 44
AM2911 AM2911A	4-bit slice cascadable microprogram address sequencer	20
AM2912	Quad bus transceiver	16
AM2913	Priority interrupt expander	20
AM2914	Vectored priority interrupt controller	40, 42, 44
AM2915 AM2915A AM2916 AM2916A	Quad 3-state registered bus transceiver with 2-port input	24
AM2917 AM2917A	Quad 3-state registered bus transceiver	20
AM2918 AM29LS18	Quad D register with standard and 3-state outputs	16, 20
AM2919	Quad D register with dual 3-state outputs	20
AM2920	Octal D flip-flop register with 3-state control	22, 24, 28
AM2921	1-to-8 decoder with 3-state outputs	20
AM2922	8-input multiplexer (MUX) with control register	20
AM2923	8-input multiplexer (MUX)	16, 20
AM2924	3-to-8 decoder/demultiplexer	16, 20
AM2925	Clock generator and microcycle length controller	24, 28
AM2926 AM2929	3-state quad bus driver and receiver	16
AM2927 AM2928	Quad 3-state bus transceiver	20, 28
AM2930	Program control unit, 4-bit slice address controller for memories	28
AM2932	Program control unit with push/pop stack, 4-bit slice address controller for memories	20, 28
AM2940	DMA address generator, cascadable 8-bit slice	28
AM2942	Programmable timer/counter or DMA address generator	22, 28
AM2946 AM2947 AM2948 AM2949	Octal 3-state bidirectional bus transceiver	20
AM2950 AM2951	8-bit bidirectional I/O port with handshake, back-to-back registers	28
AM2952 AM2953	8-bit bidirectional I/O port, back-to-back registers	24
AM2954 AM2955	Octal registers	20
AM2956 AM2957	Octal latches	20
AM2958 AM2959	Octal buffer	20
AM2960 AM2960A	Cascadable 16-bit error detection and correction unit	48, 52, 68
AM2961 AM2962	4-bit error correction multiple bus buffer	24
AM2964 AM2964B	Dynamic memory controller supporting 16K and 64K MOS dynamic RAM	40, 44
AM2965 AM2966	Octal dynamic memory driver	20
AM2968A	Dynamic memory controller supporting 16K, 64K and 256K MOS dynamic RAM	48, 68
AM2969	Memory timing controller with EDC timing control, supporting 64K, 256K, 1M and 4M MOS dynamic RAM	48, 68
AM2970	Memory timing controller supporting 64K, 256K, 1M and 4M MOS dynamic RAM	24
AM2971 AM2971A	Programmable event generator of 12 simultaneous timing sequences	24, 44
AM29700 AM29701	16-word by 4-bit Schottky RAM	16
AM29702 AM29703	16-word by 4-bit Schottky RAM	16
AM29704 AM29705 AM29705A	16-word by 4-bit, 2-port RAM	28
AM29707	16-word by 4-bit, 2-port RAM for use with AM29203	28
AM29720 AM29721	256-word by 1-bit low-power Schottky RAM	16
AM29750A AM29751A	32-word by 8-bit bipolar PROM	16
AM29760A AM29761A	256-word by 4-bit bipolar PROM	16
AM29770 AM29771	512-word by 4-bit bipolar PROM	16
AM29774 AM29775	512-word by 8-bit bipolar PROM with register	22
AM29803A	16-way branch control unit for use with AM2909A	16
AM29811A	Next address control unit for use with AM2911A	16

Documents

Databooks

• The Am2900 Family Data Book With Related Support Circuits (1979)