AMD Am2900 Totally Explained

Everything about Amd Am2900 totally explained

Am2900 is a family of integrated circuits (ICs) created in 1975 by Advanced Micro Devices (AMD). They were constructed with bipolar devices, in a bit-slice topology, and were designed to be used as modular components each representing a different aspect of a computer control unit (CCU). By using a bit slicing technique, Am2900 family was able to implement a CCU with data, addresses, and instructions to be any multiple of 4-bits by multiplying the number of ICs. One major problem with this modular technique was it required a larger amount of ICs to implement what could be done on a single CPU IC. The Am2901 chip was the arithmetic-logic unit (ALU), and the "core" of the series. It could count using 4 bits and implement binary operations as well as various bit-shifting operations.

Computers made with Am2900-family chips

There are probably many more, but here are some known machines using these parts:

Data General Nova 4, which obtained 16-bit word width using four Am2901 ALUs in parallel; one of the boards has 15 Am2901 ALUs on it (External Link).
The Xerox Dandelion, the machine used in the Xerox Star and Xerox 1108 Lisp machine (External Link).
The GEC 4060 and 4090 (External Link)
The DEC KS10 PDP-10 model (External Link)
The UCSD Pascal P-machine processor designed at NCR by Joel McCormack
The Tektronix 4052 graphics system computer
The SM-1420, Soviet clone of PDP-11, used Soviet clone of AM2901

"Legend holds that some Soviet clones of the PDP-11 were assembled from Soviet clones of the Am2901" (External Link

Members of the Am2900 family

Am2901 – 4-bit-slice ALU (1975)

Am2902 – Look-Ahead Carry Generator

Am2903 – 4-bit-slice ALU, with hardware multiply

Am2904 – Status and Shift Control Unit

Am2905 – Bus Transceiver

Am2906 – Bus Transceiver with Parity

Am2907 – Bus Transceiver with Parity

Am2908 – Bus Transceiver with Parity

Am2909 – 4-bit-slice address sequencer

Am2910 – 12-bit address sequencer

Am2911 – 4-bit-slice address sequencer

Am2912 – Bus Transceiver

Am2913 – Priority Interrupt Expander

Am2914 – Priority Interrupt Controller

Am2915 – Quad 3-State Bus Transceiver

Am2916 – Quad 3-State Bus Transceiver

Am2917 – Quad 3-State Bus Transceiver

Am2918 – Instruction Register, Quad D Register

Am2919 – Instruction Register, Quad Register

Am2920 – Octal D-Type Flip-Flop

Am2921 – 1-to-8 Decoder

Am2922 – 8-Input Multiplexer (MUX)

Am2923 – 8-Input MUX

Am2924 – 3-Line to 8-Line Decoder

Am2925 – System Clock Generator and Driver

Am2926 – Schottky 3-State Quad Bus Driver

Am2927/Am2928 – Quad 3-State Bus Transceiver

Am2929 – Schottky 3-State Quad Bus Driver

Am2930 – Main Memory Program Control

Am2932 – Main Memory Program Control

Am2940 – Direct Memory Addressing (DMA) Generator

Am2942 – Programmable Timer/Counter/DMA Generator

Am2946/Am2947 – Octal 3-State Bidirectional Bus Transceiver

Am2948/Am2949 – Octal 3-State Bidirectional Bus Transceiver

Am2950/Am2951 – 8-bit Bidirectional I/O Ports

Am2954/Am2955 – Octal Registers

Am2956/Am2957 – Octal Latches

Am2958/Am2959 – Octal Buffers/Line Drivers/Line Receivers

Am2960 – Cascadable 16-Bit Error Detection and Correction Unit

Am2961/Am2962 – 4-Bit Error Correction Multiple Buss Buffers

Am2964 – Dynamic Memory Controller

Am2965/Am2966 – Octal Dynamic Memory Driver, Further Information

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